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[MIPS] Fix bug in atomic_sub_if_positive.
authorRalf Baechle <ralf@linux-mips.org>
Thu, 3 Jul 2008 22:28:35 +0000 (23:28 +0100)
committerRalf Baechle <ralf@linux-mips.org>
Fri, 4 Jul 2008 07:22:15 +0000 (08:22 +0100)
commit50952026036c7b4212b90091bf23a264c0ccc1fb
tree50c5865ab0fdc8d4f36a69ddcc86037489a90fa9tree | snapshot
parentbf9127c36341573dc47a9c2fc003dcf13bbbf246commit | diff
[MIPS] Fix bug in atomic_sub_if_positive.

The branch optimization fixes in 2.6.21 introduced a bug in
atomic_sub_if_positive that causes it to return even when the sc
instruction fails. The result is that e.g. down_trylock becomes unreliable
as the semaphore counter is not always decremented.

Original MUA-shredded patch from Morten Larsen <mlarsen@broadcom.com>.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
include/asm-mips/atomic.h diff | blob | history
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