tree 2ad7a66b6f0dc6e0e641bef088865c5c140d0ae1
parent 49d9c81a699b57a5b6488f3a761669d05e116588
author Hirokazu Takata <takata@linux-m32r.org> 1140488895 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1140494412 -0800

[PATCH] m32r: __cmpxchg_u32 fix

This patch fixes a bug of include/asm-m32r/system.h:__cmpxchg_u32().

  static __inline__ unsigned long
  __cmpxchg_u32(volatile unsigned int *p, unsigned int old, unsigned int new);

In __cmpxchg_u32(), the "old" value must not be changed to the previous "*p"
value.  But the former code modifies the previous "*p" value.

A deadlock at _atomic_dec_and_lock sometimes happened due to this bug.

Signed-off-by: Hayato Fujiwara <fujiwara@linux-m32r.org>
Signed-off-by: Hirokazu Takata <takata@linux-m32r.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>