CodingStyle: add some more error handling guidelines

I added a paragraph on choosing label names, and updated the example
code to use a better label name.  I also cleaned up the example code to
more modern style by moving the allocation out of the initializer and
changing the NULL check.

Perhaps the most common type of error handling bug in the kernel is "one
err bugs".  CodingStyle already says that we should "avoid nesting" by
using error labels and one err style error handling tends to have
multiple indent levels, so this was already bad style.  But I've added a
new paragraph explaining how to avoid one err bugs by using multiple
error labels which is, hopefully, more clear.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Julia Lawall <julia.lawall@lip6.fr>
[jc: added GFP_KERNEL to kmalloc() call]
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
sb_edac: Fix off-by-one error in number of channels

This prevented edac sysfs code from properly handling 6 channels
per memory controller.

Signed-off-by: Jim Snow <jim.snow@intel.com>
Signed-off-by: Lukasz Anaczkowski <lukasz.anaczkowski@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
sb_edac: Fix erroneous bytes->gigabytes conversion

Signed-off-by: Jim Snow <jim.snow@intel.com>
Signed-off-by: Lukasz Anaczkowski <lukasz.anaczkowski@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
sb_edac: Fix discovery of top-of-low-memory for Haswell

Haswell moved the TOLM/TOHM registers to a different device and offset.
The sb_edac driver accounted for the change of device, but not for the
new offset.  There was also a typo in the constant to fill in the low
26 bits (was 0x1ffffff, should be 0x3ffffff).

This resulted in a bogus value for the top of low memory:

  EDAC DEBUG: get_memory_layout: TOLM: 0.032 GB (0x0000000001ffffff)

which would result in EDAC refusing to translate addresses for
errors above the bogus value and below 4GB:

   sbridge MC3: HANDLING MCE MEMORY ERROR
   sbridge MC3: CPU 0: Machine Check Event: 0 Bank 7: 8c00004000010090
   sbridge MC3: TSC 0
   sbridge MC3: ADDR 2000000
   sbridge MC3: MISC 523eac86
   sbridge MC3: PROCESSOR 0:306f3 TIME 1414600951 SOCKET 0 APIC 0
   MC3: 1 CE Error at TOLM area, on addr 0x02000000 on any memory ( page:0x0 offset:0x0 grain:32 syndrome:0x0)

With the fix we see the correct TOLM value:

   DEBUG: get_memory_layout: TOLM: 2.048 GB (0x000000007fffffff)

and we decode address 2000000 correctly:

   sbridge MC3: HANDLING MCE MEMORY ERROR
   sbridge MC3: CPU 0: Machine Check Event: 0 Bank 7: 8c00004000010090
   sbridge MC3: TSC 0
   sbridge MC3: ADDR 2000000
   sbridge MC3: MISC 523e1086
   sbridge MC3: PROCESSOR 0:306f3 TIME 1414601319 SOCKET 0 APIC 0
   DEBUG: get_memory_error_data: SAD interleave package: 0 = CPU socket 0, HA 0, shiftup: 0
   DEBUG: get_memory_error_data: TAD#0: address 0x0000000002000000 < 0x000000007fffffff, socket interleave 1, channel interleave 4 (offset 0x00000000), index 0, base ch: 0, ch mask: 0x01
   DEBUG: get_memory_error_data: RIR#0, limit: 4.095 GB (0x00000000ffffffff), way: 1
   DEBUG: get_memory_error_data: RIR#0: channel address 0x00200000 < 0xffffffff, RIR interleave 0, index 0
   DEBUG: sbridge_mce_output_error:  area:DRAM err_code:0001:0090 socket:0 channel_mask:1 rank:0
   MC3: 1 CE memory read error on CPU_SrcID#0_Channel#0_DIMM#0 (channel:0 slot:0 page:0x2000 offset:0x0 grain:32 syndrome:0x0 -  area:DRAM err_code:0001:0090 socket:0 channel_mask:1 rank:0)

Signed-off-by: Tony Luck <tony.luck@intel.com>
Acked-by: Aristeu Rozanski <aris@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
hwmon: (lm95234) Add support for LM95233

LM95233 is similar to LM95234, but it only supports two
instead of four external temperature sensors.

Reviewed-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
drm/i915: Don't pin LRC in GGTT when dumping in debugfs

LRC object does not need to be mapped into the GGTT when dumping. A side-effect
of this patch is that a compiler warning goes away (not checking return value
of i915_gem_obj_ggtt_pin).

v2: Broke out individual context dumping into a new function as the indentation
was getting a bit crazy.  Added notification of contexts with no gem object for
debugging purposes.  Removed unnecessary pin_pages and unpin_pages, replaced
with explicit get_pages for the context object as there may be no backing store
allocated at this time (Comment for get_pages says "Ensure that the associated
pages are gathered from the backing storage and pinned into our object").
Improved error checking - get_pages and get_page are checked for failure.

Signed-off-by: Thomas Daniel <thomas.daniel@intel.com>
[danvet: Align paramter continuation lines properly. Also add some
braces to the nested loops again for readability.]
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
gpio: fix deferred probe detection for legacy API

Commit 14e85c0e69d5 ("gpio: remove gpio_descs global array") changed
gpio_to_desc()'s behavior to return NULL not only for GPIOs numbers
not in the valid range, but also for all GPIOs whose controller has not
been probed yet. Although this behavior is more correct (nothing hints
that these GPIO numbers will be populated later), this affects
gpio_request() and gpio_request_one() which call gpiod_request() with a
NULL descriptor, causing it to return -EINVAL instead of the expected
-EPROBE_DEFER for a non-probed GPIO.

gpiod_request() is only called with a descriptor obtained from
gpio_to_desc() from these two functions, so address the issue there.

Other ways to obtain GPIOs rely on well-defined mappings and can thus
return -EPROBE_DEFER only for relevant GPIOs, and are thus not affected
by this issue.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
iwlwifi: define the .ucode file format for debug

Debug information can be appended to the firmware file. This
information will be used by the driver to enable / disable
debugging features in the firmware.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
iwlwifi: mvm: send dbg config hcmds to fw if set in tlv

Send all debug-configuration HCMDs that are set in the TLVs
to the FW. This may include HCMDs to configure the FW
monitor and FW log level, for example.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
iwlwifi: pcie: config regs according to fw tlv

Sometimes there is a need to configure some registers for
setting some FW properties, such as the FW monitor mode
(internal/external). This patch supports setting this for
PCIe mode.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
iwlwifi: pcie: support more monitor types dumping

Until this patch, dumping the monitor data could be done only
for PCIe external (DRAM) mode in 7000 HW family. This patch
allows to pull the monitor data also on other families, and
also to pull the monitor data if an internal buffer is used.

Signed-off-by: Liad Kaufman <liad.kaufman@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
iwlwifi: mvm: Ability to work with packed usniffer image

The new ucode package format holds also the usniffer images
(in addition to the operational images and the TLVs).
The driver can load the usniffer image if debug
configuration tells it to.

Signed-off-by: Eran Harary <eran.harary@intel.com>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
crypto: algif_skcipher - initialize upon init request

When using the algif_skcipher, the following call sequence causess a
re-initialization:

1. sendmsg with ALG_SET_OP and iov == NULL, iovlen == 0 (i.e
initializing the cipher, but not sending data)

2. sendmsg with msg->msg-controllen == 0 and iov != NULL (using the initalized
cipher handle by sending data)

In step 2, the cipher operation type (encryption or decryption) is reset
to always decryption, because the local variable of enc is put into
ctx->enc as ctx->user is still zero.

The same applies when all send data is processed and ctx->used falls to
zero followed by user space to send new data.

This patch changes the behavior to only reset the cipher operation type
(and the IV) if such configuration request is received.

Signed-off-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
crypto: sparc - replace memset by memzero_explicit

Memset on a local variable may be removed when it is called just before the
variable goes out of scope.  Using memzero_explicit defeats this
optimization.  A simplified version of the semantic patch that makes this
change is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier x;
type T;
@@

{
... when any
T x[...];
... when any
    when exists
- memset
+ memzero_explicit
  (x,
-0,
  ...)
... when != x
    when strict
}
// </smpl>

This change was suggested by Daniel Borkmann <dborkman@redhat.com>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
crypto: sha - replace memset by memzero_explicit

Memset on a local variable may be removed when it is called just before the
variable goes out of scope.  Using memzero_explicit defeats this
optimization.  A simplified version of the semantic patch that makes this
change is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier x;
type T;
@@

{
... when any
T x[...];
... when any
    when exists
- memset
+ memzero_explicit
  (x,
-0,
  ...)
... when != x
    when strict
}
// </smpl>

This change was suggested by Daniel Borkmann <dborkman@redhat.com>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
crypto: powerpc - replace memset by memzero_explicit

Memset on a local variable may be removed when it is called just before the
variable goes out of scope.  Using memzero_explicit defeats this
optimization.  A simplified version of the semantic patch that makes this
change is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier x;
type T;
@@

{
... when any
T x[...];
... when any
    when exists
- memset
+ memzero_explicit
  (x,
-0,
  ...)
... when != x
    when strict
}
// </smpl>

This change was suggested by Daniel Borkmann <dborkman@redhat.com>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
crypto: arm - replace memset by memzero_explicit

Memset on a local variable may be removed when it is called just before the
variable goes out of scope.  Using memzero_explicit defeats this
optimization.  A simplified version of the semantic patch that makes this
change is as follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
identifier x;
type T;
@@

{
... when any
T x[...];
... when any
    when exists
- memset
+ memzero_explicit
  (x,
-0,
  ...)
... when != x
    when strict
}
// </smpl>

This change was suggested by Daniel Borkmann <dborkman@redhat.com>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
dm space map metadata: fix sm_bootstrap_get_count()

Must set 'result' accordingly rather than return it.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
dm crypt: use memzero_explicit for on-stack buffer

Use memzero_explicit to cleanup sensitive data allocated on stack
to prevent the compiler from optimizing and removing memset() calls.

Signed-off-by: Milan Broz <gmazyland@gmail.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
Documentation/email-clients.txt: add info about Claws Mail

Claws Mail GUI client works.
The client is available at http://www.claws-mail.org

Signed-off-by: Richard Leitner <dev@g0hl1n.net>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>