tree ecfd97d09f431eeb15d5f6561820629fb091f4e6
parent 81e4312eeb4ed3973454ea73c5345ef927e32453
author Arve Hjønnevåg <arve@android.com> 1297746591 -0800
committer Colin Cross <ccross@android.com> 1308067799 -0700

ARM: etm: Add some missing locks and error checks

It is not safe to call etm_lock or etb_lock without holding the
mutex since another thread may also have unlocked the registers.

Also add some missing checks for valid etb_regs in the etm sysfs
entries.

Change-Id: I939f76a6ea7546a8fc0d4ddafa2fd2b6f38103bb
Signed-off-by: Arve Hjønnevåg <arve@android.com>