rc_unregister_device() will first call ir_free_table(), and later
device_del(); however, the latter causes a call to rc_dev_uevent(),
which prints rc_map.name, which at this point has already bee freed.

This fixes a use-after-free bug found with KASAN.

As reported by Shuah:

 "I am seeing the following when I do rmmod on au0828

  BUG: KASAN: use-after-free in string+0x170/0x1f0 at addr ffff8801bd513000
  Read of size 1 by task rmmod/1831
  CPU: 1 PID: 1831 Comm: rmmod Tainted: G        W       4.9.0-rc5 #5
  Hardware name: Hewlett-Packard HP ProBook 6475b/180F, BIOS 68TTU Ver. F.04 08/03/2012
  ffff8801aea2f680 ffffffff81b37ad3 ffff8801fa403b80 ffff8801bd513000
  ffff8801aea2f6a8 ffffffff8156c301 ffff8801aea2f738 ffff8801bd513000
  ffff8801fa403b80 ffff8801aea2f728 ffffffff8156c59a ffff8801aea2f770
  Call Trace:
  dump_stack+0x67/0x94
  [<ffffffff8156c301>] kasan_object_err+0x21/0x70
  [<ffffffff8156c59a>] kasan_report_error+0x1fa/0x4d0
  [<ffffffffa116f05f>] ? au0828_exit+0x10/0x21 [au0828]
  [<ffffffff8156c8b3>] __asan_report_load1_noabort+0x43/0x50
  [<ffffffff81b58b20>] ? string+0x170/0x1f0
  [<ffffffff81b58b20>] string+0x170/0x1f0
  [<ffffffff81b621c4>] vsnprintf+0x374/0x1c50
  [<ffffffff81b61e50>] ? pointer+0xa80/0xa80
  [<ffffffff8156b676>] ? save_stack+0x46/0xd0
  [<ffffffff81566faa>] ? __kmalloc+0x14a/0x2a0
  [<ffffffff81b3d70a>] ? kobject_get_path+0x9a/0x200
  [<ffffffff81b408c2>] ? kobject_uevent_env+0x282/0xca0
  [<ffffffff81b412eb>] ? kobject_uevent+0xb/0x10
  [<ffffffff81f10104>] ? device_del+0x434/0x6d0
  [<ffffffffa0fea717>] ? rc_unregister_device+0x177/0x240 [rc_core]
  [<ffffffffa116eeb0>] ? au0828_rc_unregister+0x60/0xb0 [au0828]

 The problem is fixed with this patch on Linux 4.9-rc4"
Signed-off-by: Max Kellermann <max.kellermann@gmail.com>
Tested-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

It should call of_node_put on non-null poiner.

Cc: Mauro Carvalho Chehab <mchehab@kernel.org>
Signed-off-by: Peter Chen <peter.chen@nxp.com>
Acked-by: Benoit Parrot <bparrot@ti.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

devm_pinctrl_get() can fail so we should check for that.

Fixes: 0a6824bc ('[media] v4l2: blackfin: select proper pinctrl state in ppi_set_params if CONFIG_PINCTRL is enabled')
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

There is no need to check for CONFIG_COMPAT and consequently
assign the compat_ioctl.
Signed-off-by: Andi Shyti <andi.shyti@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

When saa7134 module driving a Medion 7134 card is reloaded reads of this
card EEPROM (required for automatic detection of tuner model) will be
corrupted due to I2C gate in DVB-T demod being left closed.
This sometimes also happens on first saa7134 module load after a warm
reboot.

Fix this by opening this I2C gate before doing EEPROM read during i2c
initialization.
Signed-off-by: Maciej S. Szmigiero <mail@maciej.szmigiero.name>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

This patch fix streaming issue for Geniatech T230/PT360.
Signed-off-by: CrazyCat <crazycat69@narod.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Now that CLK_PROC_STFE is defined as a critical clock in
DT, we can remove the commented clk_disable_unprepare from
the c8sectpfe driver. This means we now have balanced
clk*enable/disable calls in the driver, but on STiH407
family the clock in reality will never actually be disabled.

This is due to a HW bug where once the IP has been configured
and the SLIM core is running, disabling the clock causes a
unrecoverable bus lockup.
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Removes the superfluous statement about writing to the FSF in the GPL
notice
Signed-off-by: Jean-Baptiste Abbadie <jb@abbadie.fr>
Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Align multiple lines statement with parentheses
Signed-off-by: Jean-Baptiste Abbadie <jb@abbadie.fr>
Acked-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

This replaces the S_* style permissions by numbers for the __ATTR macros
Signed-off-by: Jean-Baptiste Abbadie <jb@abbadie.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Document the interface between the CSI-2 transmitter and receiver drivers.
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

A multiplication for the size determination of a memory allocation
indicated that an array data structure should be processed.
Thus use the corresponding function "kmalloc_array".

This issue was detected by using the Coccinelle software.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: David Härdeman <david@hardeman.nu>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Return directly after a call of the function "rc_allocate_device" failed
at the beginning.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The local variable "ret" will be set to an appropriate value a bit later.
Thus omit the explicit initialisation at the beginning.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The local variable "rc" will be set to an appropriate value a bit later.
Thus omit the explicit initialisation at the beginning.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

* Return directly after a call of the function "kcalloc" failed
  at the beginning.

* Reorder two calls for the function "kfree" at the end.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Replace the specification of a data type by a pointer dereference
as the parameter for the operator "sizeof" to make the corresponding size
determination a bit safer.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The script "checkpatch.pl" pointed information out like the following.

WARNING: Possible unnecessary 'out of memory' message

Thus remove such a logging statement in five functions.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

* Multiplications for the size determination of memory allocations
  indicated that array data structures should be processed.
  Thus use the corresponding function "kcalloc".

  This issue was detected by using the Coccinelle software.

* Replace the specification of data types by pointer dereferences
  to make the corresponding size determination a bit safer according to
  the Linux coding style convention.
Signed-off-by: Markus Elfring <elfring@users.sourceforge.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Unfortunately, the callers of tveeprom don't do the right
thing to initialize the device. So, it produces log messages
like:

[  267.533010]  (null): Hauppauge model 42012, rev C186, serial# 2819348
[  267.533012]  (null): tuner model is Philips FQ1236 MK3 (idx 86, type 43)
[  267.533013]  (null): TV standards NTSC(M) (eeprom 0x08)
[  267.533014]  (null): audio processor is MSP3445 (idx 12)
[  267.533015]  (null): has radio

So, replace it to pr_foo(), as it should work fine.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Instead of calling printk() directly, use pr_foo() macro.

That should make the rc_core messages be formatted with the
right prefix.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Unfortunately, KERN_CONT doesn't work with dev_foo(),
producing weird messages like:

	tvp5150 6-005c: tvp5150: read 0xf6 = 0xff
	ff

So, we need to get rid of it.

As we're always printing read/write in hexa when dumping
multiple register values, also remove the "0x" from the
read/write debug messages too.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

When returning results via v4l2_subdev_core_ops.log_status,
use dev_foo() call, instead of just calling printk()
directly, without even specifying the log message level.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Instead of using v4l_foo(), use the dev_foo() macros, as
most modern media drivers.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Instead of using pr_foo(), use dev_foo(), with provides a
better output. As this device is a multi-interface one,
we'll set the device name to show the chipset and the driver
used.

While here, get rid of printk continuation messages.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Instead of using the v4l_foo() macros, just use the
kernel-wide dev_foo() macros, as there's no good reason
to use something else.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Drivers using dev_foo() macro should not use KERN_CONT, as, internally,
those macros work as if all strings were terminated by a \n. So, doing:

	dev_info(&client->dev, "%s ", client->name);
	printk(KERN_CONT "supports radio, mode is autodetect and autoselect");

Would produce the following output:

	msp3400 6-0044: msp3400
	supports radio, mode is autodetect and autoselect

As there's no good reason to use KERN_CONT, let's rewrite the code
to avoid that, allowing this driver to be converted to dev_foo().
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Currently, there's a mess at the V4L2 printk macros: some drivers
use their own macros, others use pr_foo() or v4l_foo() macros,
while more modern drivers use dev_foo() macros.

The best is to get rid of v4l_foo() macros, as they can be
replaced by either dev_foo() or pr_foo(). Yet, such change can
be disruptive, as dev_foo() cannot use KERN_CONT. So, the best
is to do such change driver by driver.

There are replacements for most v4l_foo() macros, but it lacks
a way to enable debug messages per level. So, add such macro,
in order to make the conversion easier.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Tuner core uses its own printk internal macros, instead of the
standard debug ones, for no good reason.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dvb-usb system has its own macro to print hexa dumps
(debug_dump). Such macro doesn't support messages with
KERN_CONT after commit 56387331 ("Merge branch 'printk-cleanups'").
So, let's get rid of a printk() that would be assuming that
this would work.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dprintk() macro relies on continuation lines. This is not
a good practice and will break after commit 56387331
("Merge branch 'printk-cleanups'").

So, instead of directly calling printk(), use pr_foo() macros,
adding a \n leading char on each macro call.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dprintk() macro relies on continuation lines. This is not
a good practice and will break after commit 56387331
("Merge branch 'printk-cleanups'").

So, instead of directly calling printk(), use pr_foo() macros,
adding a\n leading char on each macro call.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dprintk() macro relies on continuation lines. This is not
a good practice and will break after commit 56387331
("Merge branch 'printk-cleanups'").

So, instead of directly calling printk(), use pr_foo() macros,
adding a\n leading char on each macro call.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dprintk() macro relies on continuation lines. This is not
a good practice and will break after commit 56387331
("Merge branch 'printk-cleanups'").

So, instead of directly calling printk(), use pr_foo() macros,
adding a \n leading char on each macro call.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dprintk() macro relies on continuation lines. This is not
a good practice and will break after commit 56387331
("Merge branch 'printk-cleanups'").

So, instead of directly calling printk(), use pr_foo() macros,
adding a \n leading char on each macro call.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dprintk() macro relies on continuation lines. This is not
a good practice and will break after commit 56387331
("Merge branch 'printk-cleanups'").

So, instead of directly calling printk(), use pr_foo() macros,
adding a \n leading char on each macro call.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dprintk() macro relies on continuation lines. This is not
a good practice and will break after commit 56387331
("Merge branch 'printk-cleanups'").

So, instead of directly calling printk(), use pr_foo() macros,
adding a \n leading char on each macro call.

The frontend settings also rely on continuation lines. Change
it to avoid the need of adding pr_cont() calls.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dprintk() macro relies on continuation lines. This is not
a good practice and will break after commit 56387331
("Merge branch 'printk-cleanups").

So, instead of directly calling printk(), use pr_foo() macros,
adding a \n leading char on each macro call.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

The dprintk() macro relies on continuation lines. This is not
a good practice and will break after commit 56387331
("Merge branch 'printk-cleanups").

So, instead of directly calling printk(), use pr_foo() macros,
adding a \n leading char on each macro call.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

Continuation lines without KERN_CONT won't work anymore.
However, the way dprintk() was defined leads to the usage
of continuation lines, with should be avoided when possible.

So, redefine those macros.

While hre, remove some dead code at av7110.c with also
relies on continuation lines.
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>