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  1. 06 Feb, 2013 10 commits
    • Sarah Sharp's avatar
      USB: Ignore port state until reset completes. · 340eb6fe
      Sarah Sharp authored 
      commit 4f43447e upstream.

The port reset code bails out early if the current connect status is
cleared (device disconnected).  If we're issuing a hot reset, it may
also look at the link state before the reset is finished.

Section 10.14.2.6 of the USB 3.0 spec says that when a port enters the
Error state or Resetting state, the port connection bit retains the
value from the previous state.  Therefore we can't trust it until the
reset finishes.  Also, the xHCI spec section 4.19.1.2.5 says software
shall ignore the link state while the port is resetting, as it can be in
an unknown state.

The port state during reset is also unknown for USB 2.0 hubs.  The hub
sends a reset signal by driving the bus into an SE0 state.  This
overwhelms the "connect" signal from the device, so the port can't tell
whether anything is connected or not.

Fix the port reset code to ignore the port link state and current
connect bit until the reset finishes, and USB_PORT_STAT_RESET is
cleared.

Remove the check for USB_PORT_STAT_C_BH_RESET in the warm reset case,
because it's redundant.  When the warm reset finishes, the port reset
bit will be cleared at the same time USB_PORT_STAT_C_BH_RESET is set.
Remove the now-redundant check for a cleared USB_PORT_STAT_RESET bit
in the code to deal with the finished reset.

This patch should be backported to all stable kernels.
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      340eb6fe
    • Sarah Sharp's avatar
      USB: Increase reset timeout. · fbac94c5
      Sarah Sharp authored 
      commit 77c7f072 upstream.

John's NEC 0.96 xHCI host controller needs a longer timeout for a warm
reset to complete.  The logs show it takes 650ms to complete the warm
reset, so extend the hub reset timeout to 800ms to be on the safe side.

This commit should be backported to kernels as old as 3.2, that contain
the commit 75d7cf72 "usbcore: refine
warm reset logic".
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Reported-by: default avatarJohn Covici <covici@ccs.covici.com>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      fbac94c5
    • Sarah Sharp's avatar
      USB: Allow USB 3.0 ports to be disabled. · 8f2c189d
      Sarah Sharp authored 
      commit 41e7e056 upstream.

If hot and warm reset fails, or a port remains in the Compliance Mode,
the USB core needs to be able to disable a USB 3.0 port.  Unlike USB 2.0
ports, once the port is placed into the Disabled link state, it will not
report any new device connects.  To get device connect notifications, we
need to put the link into the Disabled state, and then the RxDetect
state.

The xHCI driver needs to atomically clear all change bits on USB 3.0
port disable, so that we get Port Status Change Events for future port
changes.  We could technically do this in the USB core instead of in the
xHCI roothub code, since the port state machine can't advance out of the
disabled state until we set the link state to RxDetect.  However,
external USB 3.0 hubs don't need this code.  They are level-triggered,
not edge-triggered like xHCI, so they will continue to send interrupt
events when any change bit is set.  Therefore it doesn't make sense to
put this code in the USB core.

This patch is part of a series to fix several reports of infinite loops
on device enumeration failure.  This includes John, when he boots with
a USB 3.0 device (Roseweil eusb3 enclosure) attached to his NEC 0.96
host controller.  The fix requires warm reset support, so it does not
make sense to backport this patch to stable kernels without warm reset
support.

This patch should be backported to kernels as old as 3.2, contain the
commit ID 75d7cf72 "usbcore: refine warm
reset logic"
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Reported-by: default avatarJohn Covici <covici@ccs.covici.com>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      8f2c189d
    • Sarah Sharp's avatar
      USB: Ignore xHCI Reset Device status. · 6cee667e
      Sarah Sharp authored 
      commit 8b8132bc upstream.

When the USB core finishes reseting a USB device, the xHCI driver sends
a Reset Device command to the host.  The xHC then updates its internal
representation of the USB device to the 'Default' device state.  If the
device was already in the Default state, the xHC will complete the
command with an error status.

If a device needs to be reset several times during enumeration, the
second reset will always fail because of the xHCI Reset Device command.
This can cause issues during enumeration.

For example, usb_reset_and_verify_device calls into hub_port_init in a
loop.  Say that on the first call into hub_port_init, the device is
successfully reset, but doesn't respond to several set address control
transfers.  Then the port will be disabled, but the udev will remain in
tact.  usb_reset_and_verify_device will call into hub_port_init again.

On the second call into hub_port_init, the device will be reset, and the
xHCI driver will issue a Reset Device command.  This command will fail
(because the device is already in the Default state), and
usb_reset_and_verify_device will fail.  The port will be disabled, and
the device won't be able to enumerate.

Fix this by ignoring the return value of the HCD reset_device callback.

This commit should be backported to kernels as old as 3.2, that contain
the commit 75d7cf72 "usbcore: refine
warm reset logic".
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      6cee667e
    • Sarah Sharp's avatar
      USB: Handle auto-transition from hot to warm reset. · 330a5270
      Sarah Sharp authored 
      commit 1c7439c6 upstream.

USB 3.0 hubs and roothubs will automatically transition a failed hot
reset to a warm (BH) reset.  In that case, the warm reset change bit
will be set, and the link state change bit may also be set.  Change
hub_port_finish_reset to unconditionally clear those change bits for USB
3.0 hubs.  If these bits are not cleared, we may lose port change events
from the roothub.

This commit should be backported to kernels as old as 3.2, that contain
the commit 75d7cf72 "usbcore: refine
warm reset logic".
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      330a5270
    • Sarah Sharp's avatar
      xhci: Handle HS bulk/ctrl endpoints that don't NAK. · 4a2b6c95
      Sarah Sharp authored 
      commit 55c1945e upstream.

A high speed control or bulk endpoint may have bInterval set to zero,
which means it does not NAK.  If bInterval is non-zero, it means the
endpoint NAKs at a rate of 2^(bInterval - 1).

The xHCI code to compute the NAK interval does not handle the special
case of zero properly.  The current code unconditionally subtracts one
from bInterval and uses it as an exponent.  This causes a very large
bInterval to be used, and warning messages like these will be printed:

usb 1-1: ep 0x1 - rounding interval to 32768 microframes, ep desc says 0 microframes

This may cause the xHCI host hardware to reject the Configure Endpoint
command, which means the HS device will be unusable under xHCI ports.

This patch should be backported to kernels as old as 2.6.31, that contain
commit dfa49c4a "USB: xhci - fix math in
xhci_get_endpoint_interval()".
Reported-by: default avatarVincent Pelletier <plr.vincent@gmail.com>
Suggested-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarSarah Sharp <sarah.a.sharp@linux.intel.com>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      4a2b6c95
    • Johannes Berg's avatar
      mac80211: use del_timer_sync for final sta cleanup timer deletion · ac2c3982
      Johannes Berg authored 
      commit a56f992c upstream.

This is a very old bug, but there's nothing that prevents the
timer from running while the module is being removed when we
only do del_timer() instead of del_timer_sync().

The timer should normally not be running at this point, but
it's not clearly impossible (or we could just remove this.)
Tested-by: default avatarBen Greear <greearb@candelatech.com>
Signed-off-by: default avatarJohannes Berg <johannes.berg@intel.com>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      ac2c3982
    • Alexander Graf's avatar
      virtio-blk: Don't free ida when disk is in use · 63dddb49
      Alexander Graf authored 
      commit f4953fe6 upstream.

When a file system is mounted on a virtio-blk disk, we then remove it
and then reattach it, the reattached disk gets the same disk name and
ids as the hot removed one.

This leads to very nasty effects - mostly rendering the newly attached
device completely unusable.

Trying what happens when I do the same thing with a USB device, I saw
that the sd node simply doesn't get free'd when a device gets forcefully
removed.

Imitate the same behavior for vd devices. This way broken vd devices
simply are never free'd and newly attached ones keep working just fine.
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      63dddb49
    • Sergei Shtylyov's avatar
      usb: musb: core: print new line in the driver banner again · 9d38cd59
      Sergei Shtylyov authored 
      commit 2ac788f7 upstream.

Commit 5c8a86e1 (usb: musb: drop unneeded
musb_debug trickery) erroneously removed '\n' from the driver's banner.
Concatenate all the banner substrings while adding it back...
Signed-off-by: default avatarSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      9d38cd59
    • Sebastian Andrzej Siewior's avatar
      usb: gadget: dummy: fix enumeration with g_multi · 7cce8398
      Sebastian Andrzej Siewior authored 
      commit 1d16638e upstream.

If we do have endpoints named like "ep-a" then bEndpointAddress is
counted internally by the gadget framework.

If we do have endpoints named like "ep-1" then bEndpointAddress is
assigned from the digit after "ep-".

If we do have both, then it is likely that after we used up the
"generic" endpoints we will use the digits and thus assign one
bEndpointAddress to multiple endpoints.

This theory can be proofed by using the completely enabled g_multi.
Without this patch, the mass storage won't enumerate and times out
because it shares endpoints with RNDIS.

This patch also adds fills up the endpoints list so we have in total
endpoints 1 to 15 in + out available while some of them are restricted
to certain types like BULK or ISO. Without this change the nokia gadget
won't load because the system does not provide enough (BULK) endpoints
but it did before ep-a - ep-f were removed.
Signed-off-by: default avatarSebastian Andrzej Siewior <bigeasy@linutronix.de>
Acked-by: default avatarAlan Stern <stern@rowland.harvard.edu>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
      7cce8398
  3. 16 Jan, 2013 30 commits
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