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| author | John W. Linville <linville@tuxdriver.com> | 2006-08-29 16:17:25 -0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2006-08-29 16:17:25 -0400 |
| commit | e4ac2663ea27d5dda88d97d117080995fcfcd6d5 (patch) | |
| tree | 74eac23956a86546ed93eac973b0bc4744b97ccc /drivers/acpi/osl.c | |
| parent | 4c2be501b7e8695f8bdf4f7d5f51595ed55eea44 (diff) | |
| parent | d96299537e43681942ea272e00b0e529aa5b5fa4 (diff) | |
Merge branch 'from-linus' into upstream
Diffstat (limited to 'drivers/acpi/osl.c')
| -rw-r--r-- | drivers/acpi/osl.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c index b7d1514cd19..507f051d1ce 100644 --- a/drivers/acpi/osl.c +++ b/drivers/acpi/osl.c @@ -746,6 +746,16 @@ acpi_status acpi_os_wait_semaphore(acpi_handle handle, u32 units, u16 timeout) ACPI_DEBUG_PRINT((ACPI_DB_MUTEX, "Waiting for semaphore[%p|%d|%d]\n", handle, units, timeout)); + /* + * This can be called during resume with interrupts off. + * Like boot-time, we should be single threaded and will + * always get the lock if we try -- timeout or not. + * If this doesn't succeed, then we will oops courtesy of + * might_sleep() in down(). + */ + if (!down_trylock(sem)) + return AE_OK; + switch (timeout) { /* * No Wait: |