tree 50c5865ab0fdc8d4f36a69ddcc86037489a90fa9
parent bf9127c36341573dc47a9c2fc003dcf13bbbf246
author Ralf Baechle <ralf@linux-mips.org> 1215124115 +0100
committer Ralf Baechle <ralf@linux-mips.org> 1215156135 +0100

[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>