- 06 Sep, 2013 5 commits
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Max Filippov authored
Instead of emulating movsp instruction in the kernel use window underflow handler to load missing register window and retry failed movsp. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
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Max Filippov authored
Based on the SMP patch by Joe Taylor and subsequent fixes. Preserve exception table pointer (normally stored in excsave1 SR) as it cannot be easily restored in SMP environment. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
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Max Filippov authored
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
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Max Filippov authored
Check pending signals and rescheduling thread flags with interrupts disabled, and don't enable them if no flags are set. Call trace_hardirqs_on after thread flags handling, so that rescheduling is done and hardirqs tracking flag is updated in the correct task context. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net>
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Chris Zankel authored
Update Xtensa tree to Linux 3.11 (merging)
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- 02 Sep, 2013 4 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiLinus Torvalds authored
Pull SCSI fix from James Bottomley: "This is a bug fix for the pm80xx driver. It turns out that when the new hardware support was added in 3.10 the IO command size was kept at the old hard coded value. This means that the driver attaches to some new cards and then simply hangs the system" * tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: [SCSI] pm80xx: fix Adaptec 71605H hang
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git://git.kernel.org/pub/scm/linux/kernel/git/tip/tipLinus Torvalds authored
Pull x86 boot fix from Peter Anvin: "A single very small boot fix for very large memory systems (> 0.5T)" * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/mm: Fix boot crash with DEBUG_PAGE_ALLOC=y and more than 512G RAM
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git://git.infradead.org/users/vkoul/slave-dmaLinus Torvalds authored
Pull slave-dma fix from Vinod Koul: "A fix for resolving TI_EDMA driver's build error in allmodconfig to have filter function built in"" * 'fixes' of git://git.infradead.org/users/vkoul/slave-dma: dma/Kconfig: TI_EDMA needs to be boolean
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- 31 Aug, 2013 3 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds authored
Pull networking fixes from David Miller: 1) There was a simplification in the ipv6 ndisc packet sending attempted here, which avoided using memory accounting on the per-netns ndisc socket for sending NDISC packets. It did fix some important issues, but it causes regressions so it gets reverted here too. Specifically, the problem with this change is that the IPV6 output path really depends upon there being a valid skb->sk attached. The reason we want to do this change in some form when we figure out how to do it right, is that if a device goes down the ndisc_sk socket send queue will fill up and block NDISC packets that we want to send to other devices too. That's really bad behavior. Hopefully Thomas can come up with a better version of this change. 2) Fix a severe TCP performance regression by reverting a change made to dev_pick_tx() quite some time ago. From Eric Dumazet. 3) TIPC returns wrongly signed error codes, fix from Erik Hugne. 4) Fix OOPS when doing IPSEC over ipv4 tunnels due to orphaning the skb->sk too early. Fix from Li Hongjun. 5) RAW ipv4 sockets can use the wrong routing key during lookup, from Chris Clark. 6) Similar to #1 revert an older change that tried to use plain alloc_skb() for SYN/ACK TCP packets, this broke the netfilter owner mark which needs to see the skb->sk for such frames. From Phil Oester. 7) BNX2x driver bug fixes from Ariel Elior and Yuval Mintz, specifically in the handling of virtual functions. 8) IPSEC path error propagations to sockets is not done properly when we have v4 in v6, and v6 in v4 type rules. Fix from Hannes Frederic Sowa. 9) Fix missing channel context release in mac80211, from Johannes Berg. 10) Fix network namespace handing wrt. SCM_RIGHTS, from Andy Lutomirski. 11) Fix usage of bogus NAPI weight in jme, netxen, and ps3_gelic drivers. From Michal Schmidt. 12) Hopefully a complete and correct fix for the genetlink dump locking and module reference counting. From Pravin B Shelar. 13) sk_busy_loop() must do a cpu_relax(), from Eliezer Tamir. 14) Fix handling of timestamp offset when restoring a snapshotted TCP socket. From Andrew Vagin. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (44 commits) net: fec: fix time stamping logic after napi conversion net: bridge: convert MLDv2 Query MRC into msecs_to_jiffies for max_delay mISDN: return -EINVAL on error in dsp_control_req() net: revert 8728c544 ("net: dev_pick_tx() fix") Revert "ipv6: Don't depend on per socket memory for neighbour discovery messages" ipv4 tunnels: fix an oops when using ipip/sit with IPsec tipc: set sk_err correctly when connection fails tcp: tcp_make_synack() should use sock_wmalloc bridge: separate querier and query timer into IGMP/IPv4 and MLD/IPv6 ones ipv6: Don't depend on per socket memory for neighbour discovery messages ipv4: sendto/hdrincl: don't use destination address found in header tcp: don't apply tsoffset if rcv_tsecr is zero tcp: initialize rcv_tstamp for restored sockets net: xilinx: fix memleak net: usb: Add HP hs2434 device to ZLP exception table net: add cpu_relax to busy poll loop net: stmmac: fixed the pbl setting with DT genl: Hold reference on correct module while netlink-dump. genl: Fix genl dumpit() locking. xfrm: Fix potential null pointer dereference in xdst_queue_output ...
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Ian Campbell authored
Filtering capabilities on my work email are pretty much non-existent and this has turned out to be something of a firehose... Cc: Stephen Warren <swarren@wwwdotorg.org> Cc: Rob Herring <rob.herring@calxeda.com> Cc: Olof Johansson <olof@lixom.net> Cc: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Ian Campbell <ian.campbell@citrix.com> Acked-by: Pawel Moll <pawel.moll@arm.com> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/soundLinus Torvalds authored
Pull sound fixes from Takashi Iwai: "This contains two Oops fixes (opti9xx and HD-audio) and a simple fixup for an Acer laptop. All marked as stable patches" * tag 'sound-3.11' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound: ALSA: opti9xx: Fix conflicting driver object name ALSA: hda - Fix NULL dereference with CONFIG_SND_DYNAMIC_MINORS=n ALSA: hda - Add inverted digital mic fixup for Acer Aspire One
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- 30 Aug, 2013 15 commits
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull ARM SoC fixes from Olof Johansson: "Two straggling fixes that I had missed as they were posted a couple of weeks ago, causing problems with interrupts (breaking them completely) on the CSR SiRF platforms" * tag 'fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: arm: prima2: drop nr_irqs in mach as we moved to linear irqdomain irqchip: sirf: move from legacy mode to linear irqdomain
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git://people.freedesktop.org/~airlied/linuxLinus Torvalds authored
Pull drm fixes from Dave Airlie: "Since we are getting to the pointy end, one i915 black screen on some machines, and one vmwgfx stop userspace ability to nuke the VM, There might be one or two ati or nouveau fixes trickle in before final, but I think this should pretty much be it" * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: drm/vmwgfx: Split GMR2_REMAP commands if they are to large drm/i915: ivb: fix edp voltage swing reg val
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git://git.kernel.org/pub/scm/linux/kernel/git/dtor/inputLinus Torvalds authored
Pull input layer updates from Dmitry Torokhov: "Just a couple of new IDs in Wacom and xpad drivers, i8042 is now disabled on ARC, and data checks in Elantech driver that were overly relaxed by the previous patch are now tightened" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: Input: i8042 - disable the driver on ARC platforms Input: xpad - add signature for Razer Onza Classic Edition Input: elantech - fix packet check for v3 and v4 hardware Input: wacom - add support for 0x300 and 0x301
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Richard Cochran authored
Commit dc975382 "net: fec: add napi support to improve proformance" converted the fec driver to the napi model. However, that commit forgot to remove the call to skb_defer_rx_timestamp which is only needed in non-napi drivers. (The function napi_gro_receive eventually calls netif_receive_skb, which in turn calls skb_defer_rx_timestamp.) This patch should also be applied to the 3.9 and 3.10 kernels. Signed-off-by: Richard Cochran <richardcochran@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Daniel Borkmann authored
While looking into MLDv1/v2 code, I noticed that bridging code does not convert it's max delay into jiffies for MLDv2 messages as we do in core IPv6' multicast code. RFC3810, 5.1.3. Maximum Response Code says: The Maximum Response Code field specifies the maximum time allowed before sending a responding Report. The actual time allowed, called the Maximum Response Delay, is represented in units of milliseconds, and is derived from the Maximum Response Code as follows: [...] As we update timers that work with jiffies, we need to convert it. Signed-off-by: Daniel Borkmann <dborkman@redhat.com> Cc: Linus Lüssing <linus.luessing@web.de> Cc: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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Dan Carpenter authored
If skb->len is too short then we should return an error. Otherwise we read beyond the end of skb->data for several bytes. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Eric Dumazet authored
commit 8728c544 ("net: dev_pick_tx() fix") and commit b6fe83e9 ("bonding: refine IFF_XMIT_DST_RELEASE capability") are quite incompatible : Queue selection is disabled because skb dst was dropped before entering bonding device. This causes major performance regression, mainly because TCP packets for a given flow can be sent to multiple queues. This is particularly visible when using the new FQ packet scheduler with MQ + FQ setup on the slaves. We can safely revert the first commit now that 416186fb ("net: Split core bits of netdev_pick_tx into __netdev_pick_tx") properly caps the queue_index. Reported-by: Xi Wang <xii@google.com> Diagnosed-by: Xi Wang <xii@google.com> Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Tom Herbert <therbert@google.com> Cc: Alexander Duyck <alexander.h.duyck@intel.com> Cc: Denys Fedorysychenko <nuclearcat@nuclearcat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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David S. Miller authored
This reverts commit 1f324e38. It seems to cause regressions, and in particular the output path really depends upon there being a socket attached to skb->sk for checks such as sk_mc_loop(skb->sk) for example. See ip6_output_finish2(). Reported-by: Stephen Warren <swarren@wwwdotorg.org> Reported-by: Fabio Estevam <festevam@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Li Hongjun authored
Since commit 3d7b46cd (ip_tunnel: push generic protocol handling to ip_tunnel module.), an Oops is triggered when an xfrm policy is configured on an IPv4 over IPv4 tunnel. xfrm4_policy_check() calls __xfrm_policy_check2(), which uses skb_dst(skb). But this field is NULL because iptunnel_pull_header() calls skb_dst_drop(skb). Signed-off-by: Li Hongjun <hongjun.li@6wind.com> Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Erik Hugne authored
Should a connect fail, if the publication/server is unavailable or due to some other error, a positive value will be returned and errno is never set. If the application code checks for an explicit zero return from connect (success) or a negative return (failure), it will not catch the error and subsequent send() calls will fail as shown from the strace snippet below. socket(0x1e /* PF_??? */, SOCK_SEQPACKET, 0) = 3 connect(3, {sa_family=0x1e /* AF_??? */, sa_data="\2\1\322\4\0\0\322\4\0\0\0\0\0\0"}, 16) = 111 sendto(3, "test", 4, 0, NULL, 0) = -1 EPIPE (Broken pipe) The reason for this behaviour is that TIPC wrongly inverts error codes set in sk_err. Signed-off-by: Erik Hugne <erik.hugne@ericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Phil Oester authored
In commit 90ba9b19 (tcp: tcp_make_synack() can use alloc_skb()), Eric changed the call to sock_wmalloc in tcp_make_synack to alloc_skb. In doing so, the netfilter owner match lost its ability to block the SYNACK packet on outbound listening sockets. Revert the change, restoring the owner match functionality. This closes netfilter bugzilla #847. Signed-off-by: Phil Oester <kernel@linuxace.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Linus Lüssing authored
Currently we would still potentially suffer multicast packet loss if there is just either an IGMP or an MLD querier: For the former case, we would possibly drop IPv6 multicast packets, for the latter IPv4 ones. This is because we are currently assuming that if either an IGMP or MLD querier is present that the other one is present, too. This patch makes the behaviour and fix added in "bridge: disable snooping if there is no querier" (b00589af) to also work if there is either just an IGMP or an MLD querier on the link: It refines the deactivation of the snooping to be protocol specific by using separate timers for the snooped IGMP and MLD queries as well as separate timers for our internal IGMP and MLD queriers. Signed-off-by: Linus Lüssing <linus.luessing@web.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroupLinus Torvalds authored
Pull cgroup fix from Tejun Heo: "During the percpu reference counting update which was merged during v3.11-rc1, the cgroup destruction path was updated so that a cgroup in the process of dying may linger on the children list, which was necessary as the cgroup should still be included in child/descendant iteration while percpu ref is being killed. Unfortunately, I forgot to update cgroup destruction path accordingly and cgroup destruction may fail spuriously with -EBUSY due to lingering dying children even when there's no live child left - e.g. "rmdir parent/child parent" will usually fail. This can be easily fixed by iterating through the children list to verify that there's no live child left. While this is very late in the release cycle, this bug is very visible to userland and I believe the fix is relatively safe. Thanks Hugh for spotting and providing fix for the issue" * 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup: cgroup: fix rmdir EBUSY regression in 3.11
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git://git.kernel.org/pub/scm/linux/kernel/git/tj/wqLinus Torvalds authored
Pull workqueue fix from Tejun Heo: "This contains one fix which could lead to system-wide lockup on !PREEMPT kernels. It's very late in the cycle but this definitely is a -stable material. The problem is that workqueue worker tasks may process unlimited number of work items back-to-back without every yielding inbetween. This usually isn't noticeable but a work item which re-queues itself waiting for someone else to do something can deadlock with stop_machine. stop_machine will ensure nothing else happens on all other cpus and the requeueing work item will reqeueue itself indefinitely without ever yielding and thus preventing the CPU from entering stop_machine. Kudos to Jamie Liu for spotting and diagnosing the problem. This can be trivially fixed by adding cond_resched() after processing each work item" * 'for-3.11-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq: workqueue: cond_resched() after processing each work item
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git://git.linux-nfs.org/projects/trondmy/linux-nfsLinus Torvalds authored
Pull NFS client bugfix from Trond Myklebust: "Stable patch to fix a highmem-related data corruption issue on 32-bit ARM platforms" * tag 'nfs-for-3.11-5' of git://git.linux-nfs.org/projects/trondmy/linux-nfs: SUNRPC: Fix memory corruption issue on 32-bit highmem systems
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- 29 Aug, 2013 13 commits
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Jakob Bornecrantz authored
This fixes the piglit test texturing/max-texture-size causing the VM to die due to a too large SVGA command. Signed-off-by: Jakob Bornecrantz <jakob@vmware.com> Reviewed-by: Biran Paul <brianp@vmware.com> Reviewed-by: Zack Rusin <zackr@vmware.com> Cc: stable@vger.kernel.org Signed-off-by: Dave Airlie <airlied@gmail.com>
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Dave Airlie authored
Merge tag 'drm-intel-fixes-2013-08-30' of git://people.freedesktop.org/~danvet/drm-intel into drm-fixes Just a one-line patch to fix a black screen issue on rare ivb machines, cc: stable. Normally I'd just shovel this into the -next pull request this late in the -rc cycle, but Linus was making noises about not getting real fixes which are cc: stable. So here we go ;-) * tag 'drm-intel-fixes-2013-08-30' of git://people.freedesktop.org/~danvet/drm-intel: drm/i915: ivb: fix edp voltage swing reg val
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Imre Deak authored
Fix the typo introduced in commit 1a2eb460 Author: Keith Packard <keithp@keithp.com> Date: Wed Nov 16 16:26:07 2011 -0800 drm/i915: Hook up Ivybridge eDP This fixes eDP link-training failures and cases where all voltage swing /pre-emphasis levels were tried and failed during clock recovery and - as a fallback - we go on to do channel equalization with the last voltage swing/pre-emphasis level which will succeed. Both issues can lead to a blank screen. v2: - improve commit message CC: stable@vger.kernel.org Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=64880Tested-by: Jeremy Moles <cubicool@gmail.com> Signed-off-by: Imre Deak <imre.deak@intel.com> Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
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git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsecDavid S. Miller authored
Steffen Klassert says: ==================== This pull request fixes some issues that arise when 6in4 or 4in6 tunnels are used in combination with IPsec, all from Hannes Frederic Sowa and a null pointer dereference when queueing packets to the policy hold queue. 1) We might access the local error handler of the wrong address family if 6in4 or 4in6 tunnel is protected by ipsec. Fix this by addind a pointer to the correct local_error to xfrm_state_afinet. 2) Add a helper function to always refer to the correct interpretation of skb->sk. 3) Call skb_reset_inner_headers to record the position of the inner headers when adding a new one in various ipv6 tunnels. This is needed to identify the addresses where to send back errors in the xfrm layer. 4) Dereference inner ipv6 header if encapsulated to always call the right error handler. 5) Choose protocol family by skb protocol to not call the wrong xfrm{4,6}_local_error handler in case an ipv6 sockets is used in ipv4 mode. 6) Partly revert "xfrm: introduce helper for safe determination of mtu" because this introduced pmtu discovery problems. 7) Set skb->protocol on tcp, raw and ip6_append_data genereated skbs. We need this to get the correct mtu informations in xfrm. 8) Fix null pointer dereference in xdst_queue_output. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
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Thomas Graf authored
Allocating skbs when sending out neighbour discovery messages currently uses sock_alloc_send_skb() based on a per net namespace socket and thus share a socket wmem buffer space. If a netdevice is temporarily unable to transmit due to carrier loss or for other reasons, the queued up ndisc messages will cosnume all of the wmem space and will thus prevent from any more skbs to be allocated even for netdevices that are able to transmit packets. The number of neighbour discovery messages sent is very limited, simply use alloc_skb() and don't depend on any socket wmem space any longer. This patch has orginally been posted by Eric Dumazet in a modified form. Signed-off-by: Thomas Graf <tgraf@suug.ch> Cc: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Chris Clark authored
ipv4: raw_sendmsg: don't use header's destination address A sendto() regression was bisected and found to start with commit f8126f1d (ipv4: Adjust semantics of rt->rt_gateway.) The problem is that it tries to ARP-lookup the constructed packet's destination address rather than the explicitly provided address. Fix this using FLOWI_FLAG_KNOWN_NH so that given nexthop is used. cf. commit 2ad5b9e4Reported-by: Chris Clark <chris.clark@alcatel-lucent.com> Bisected-by: Chris Clark <chris.clark@alcatel-lucent.com> Tested-by: Chris Clark <chris.clark@alcatel-lucent.com> Suggested-by: Julian Anastasov <ja@ssi.bg> Signed-off-by: Chris Clark <chris.clark@alcatel-lucent.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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Andrew Vagin authored
The zero value means that tsecr is not valid, so it's a special case. tsoffset is used to customize tcp_time_stamp for one socket. tsoffset is usually zero, it's used when a socket was moved from one host to another host. Currently this issue affects logic of tcp_rcv_rtt_measure_ts. Due to incorrect value of rcv_tsecr, tcp_rcv_rtt_measure_ts sets rto to TCP_RTO_MAX. Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Cc: James Morris <jmorris@namei.org> Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org> Cc: Patrick McHardy <kaber@trash.net> Reported-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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Andrew Vagin authored
u32 rcv_tstamp; /* timestamp of last received ACK */ Its value used in tcp_retransmit_timer, which closes socket if the last ack was received more then TCP_RTO_MAX ago. Currently rcv_tstamp is initialized to zero and if tcp_retransmit_timer is called before receiving a first ack, the connection is closed. This patch initializes rcv_tstamp to a timestamp, when a socket was restored. Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> Cc: James Morris <jmorris@namei.org> Cc: Hideaki YOSHIFUJI <yoshfuji@linux-ipv6.org> Cc: Patrick McHardy <kaber@trash.net> Reported-by: Cyrill Gorcunov <gorcunov@openvz.org> Signed-off-by: Andrey Vagin <avagin@openvz.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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Barry Song authored
we don't need nr_irqs in machine any more after we move to linear irqdomain for sirfsoc irqchip, so drop them. Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Olof Johansson <olof@lixom.net>
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Barry Song authored
the series of patches for irqdomain core in 3.11 has broken sirf irq which uses legacy mapping. all users fail in the new kernel while setupping irq. this patch moves to linear irqdomain and drop old legacy irqdomain codes since we don't need it any more, and at the same time, it also fixes the broken interrupts of sirfsoc in 3.11. on the other hand, we actually only have 64 interrupt sources for prima2 and atlas6, but there are 128 interrupt souces for marco which uses GIC. in the legacy codes, sirf gpio also uses legacy irqdomain, so to make gpio interrupt mapping not depend on the prima2/atlas6/marco an use unified marco,we enlarge prima2/atlas6 interrupt number to 128. here we don't need this workaround any more as sirf gpio also moved to linear mode before. so we move SIRFSOC_NUM_IRQS back to 64 too. Signed-off-by: Barry Song <Baohua.Song@csr.com> Signed-off-by: Olof Johansson <olof@lixom.net>
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Mischa Jonker authored
It causes crashes when enabled, and we don't have such a peripheral anyway on ARC platforms. Signed-off-by: Mischa Jonker <mjonker@synopsys.com> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
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Hugh Dickins authored
On 3.11-rc we are seeing cgroup directories left behind when they should have been removed. Here's a trivial reproducer: cd /sys/fs/cgroup/memory mkdir parent parent/child; rmdir parent/child parent rmdir: failed to remove `parent': Device or resource busy It's because cgroup_destroy_locked() (step 1 of destruction) leaves cgroup on parent's children list, letting cgroup_offline_fn() (step 2 of destruction) remove it; but step 2 is run by work queue, which may not yet have removed the children when parent destruction checks the list. Fix that by checking through a non-empty list of children: if every one of them has already been marked CGRP_DEAD, then it's safe to proceed: those children are invisible to userspace, and should not obstruct rmdir. (I didn't see any reason to keep the cgrp->children checks under the unrelated css_set_lock, so moved them out.) tj: Flattened nested ifs a bit and updated comment so that it's correct on both for-3.11-fixes and for-3.12. Signed-off-by: Hugh Dickins <hughd@google.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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Tejun Heo authored
If !PREEMPT, a kworker running work items back to back can hog CPU. This becomes dangerous when a self-requeueing work item which is waiting for something to happen races against stop_machine. Such self-requeueing work item would requeue itself indefinitely hogging the kworker and CPU it's running on while stop_machine would wait for that CPU to enter stop_machine while preventing anything else from happening on all other CPUs. The two would deadlock. Jamie Liu reports that this deadlock scenario exists around scsi_requeue_run_queue() and libata port multiplier support, where one port may exclude command processing from other ports. With the right timing, scsi_requeue_run_queue() can end up requeueing itself trying to execute an IO which is asked to be retried while another device has an exclusive access, which in turn can't make forward progress due to stop_machine. Fix it by invoking cond_resched() after executing each work item. Signed-off-by: Tejun Heo <tj@kernel.org> Reported-by: Jamie Liu <jamieliu@google.com> References: http://thread.gmane.org/gmane.linux.kernel/1552567 Cc: stable@vger.kernel.org -- kernel/workqueue.c | 9 +++++++++ 1 file changed, 9 insertions(+)
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