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authorKevin Cernekee <cernekee@gmail.com>2010-11-23 13:26:44 -0500
committerRalf Baechle <ralf@linux-mips.org>2010-12-16 13:10:58 -0500
commit5878fc936aebf592cca418ca50773cd578f7daf4 (patch)
treeee9d8cec2235b737cfb2cd931e43ede7d9772a53 /arch/mips
parent190fca3e40a65303eac35ac4fbae4f1f1342431c (diff)
MIPS: Fix CP0 COUNTER clockevent race
Consider the following test case: write_c0_compare(read_c0_count()); Even if the counter doesn't increment during execution, this might not generate an interrupt until the counter wraps around. The CPU may perform the comparison each time CP0 COUNT increments, not when CP0 COMPARE is written. If mips_next_event() is called with a very small delta, and CP0 COUNT increments during the calculation of "cnt += delta", it is possible that CP0 COMPARE will be written with the current value of CP0 COUNT. If this is detected, the function should return -ETIME, to indicate that the interrupt might not have actually gotten scheduled. Signed-off-by: Kevin Cernekee <cernekee@gmail.com> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1836/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips')
-rw-r--r--arch/mips/kernel/cevt-r4k.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c
index 2f4d7a99bcc2..98c5a9737c14 100644
--- a/arch/mips/kernel/cevt-r4k.c
+++ b/arch/mips/kernel/cevt-r4k.c
@@ -32,7 +32,7 @@ static int mips_next_event(unsigned long delta,
32 cnt = read_c0_count(); 32 cnt = read_c0_count();
33 cnt += delta; 33 cnt += delta;
34 write_c0_compare(cnt); 34 write_c0_compare(cnt);
35 res = ((int)(read_c0_count() - cnt) > 0) ? -ETIME : 0; 35 res = ((int)(read_c0_count() - cnt) >= 0) ? -ETIME : 0;
36 return res; 36 return res;
37} 37}
38 38