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author | Hirokazu Takata <takata@linux-m32r.org> | 2005-11-29 00:43:58 +0300 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-29 01:42:24 +0300 |
commit | 91f4ab056d85d23fa6955927fdeb1558673e8cd1 (patch) | |
tree | 95745578b92f329b3fbe7761baf8c422b2975473 | |
parent | bce61dd49d6ba7799be2de17c772e4c701558f14 (diff) | |
download | linux-91f4ab056d85d23fa6955927fdeb1558673e8cd1.tar.xz |
[PATCH] m32r: Fix sys_tas() syscall
This patch fixes a deadlock problem of the m32r SMP kernel.
In the m32r kernel, sys_tas() system call is provided as a test-and-set
function for userspace, for backward compatibility.
In some multi-threading application program, deadlocks were rarely caused
at sys_tas() funcion. Such a deadlock was caused due to a collision of
__pthread_lock() and __pthread_unlock() operations.
The "tas" syscall is repeatedly called by pthread_mutex_lock() to get a
lock, while a lock variable's value is not 0. On the other hand,
pthead_mutex_unlock() sets the lock variable to 0 for unlocking.
In the previous implementation of sys_tas() routine, there was a
possibility that a unlock operation was ignored in the following case:
- Assume a lock variable (*addr) was equal to 1 before sys_tas() execution.
- __pthread_unlock() operation is executed by the other processor
and the lock variable (*addr) is set to 0, between a read operation
("oldval = *addr;") and the following write operation ("*addr = 1;")
during a execution of sys_tas().
In this case, the following write operation ("*addr = 1;") overwrites the
__pthread_unlock() result, and sys_tas() fails to get a lock in the next
turn and after that.
According to the attatched patch, sys_tas() returns 0 value in the next
turn and deadlocks never happen.
Signed-off-by: Hitoshi Yamamoto <Yamamoto.Hitoshi@ap.MitsubishiElectric.co.jp>
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>
-rw-r--r-- | arch/m32r/kernel/sys_m32r.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/arch/m32r/kernel/sys_m32r.c b/arch/m32r/kernel/sys_m32r.c index e0500e12c5fb..fe55b28d3725 100644 --- a/arch/m32r/kernel/sys_m32r.c +++ b/arch/m32r/kernel/sys_m32r.c @@ -41,7 +41,8 @@ asmlinkage int sys_tas(int *addr) return -EFAULT; local_irq_save(flags); oldval = *addr; - *addr = 1; + if (!oldval) + *addr = 1; local_irq_restore(flags); return oldval; } @@ -59,7 +60,8 @@ asmlinkage int sys_tas(int *addr) _raw_spin_lock(&tas_lock); oldval = *addr; - *addr = 1; + if (!oldval) + *addr = 1; _raw_spin_unlock(&tas_lock); return oldval; |