drivers/cpufreq/pcc-cpufreq.c: avoid NULL pointer dereference
commite71f5cc402ecb42b407ae52add7b173bf1c53daa
authorNaga Chumbalkar <nagananda.chumbalkar@hp.com>
Wed, 14 Sep 2011 23:22:23 +0000 (14 16:22 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 15 Sep 2011 01:09:38 +0000 (14 18:09 -0700)
tree03e1b260a42a59e3fea1a3db4f39a9a260dd0a58
parent88cee8fd77af28d414b983798dd30c8950c71e31
drivers/cpufreq/pcc-cpufreq.c: avoid NULL pointer dereference

per_cpu(processors, n) can be NULL, resulting in:

  Loading CPUFreq modules[  437.661360] BUG: unable to handle kernel NULL pointer dereference at (null)
  IP: [<ffffffffa0434314>] pcc_cpufreq_cpu_init+0x74/0x220 [pcc_cpufreq]

It's better to avoid the oops by failing the driver, and allowing the
system to boot.

Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com>
Cc: Dave Jones <davej@codemonkey.org.uk>
Cc: Len Brown <lenb@kernel.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
drivers/cpufreq/pcc-cpufreq.c