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| author | Steven Whitehouse <swhiteho@redhat.com> | 2006-08-29 11:39:34 -0400 |
|---|---|---|
| committer | Steven Whitehouse <swhiteho@redhat.com> | 2006-08-29 11:39:34 -0400 |
| commit | 83b7a664a0c7c39ccfa4c72535dc1c001d4e7a18 (patch) | |
| tree | 5ba3bbbe977c2047658b41e22d6b2abd5686bf15 /drivers/acpi/osl.c | |
| parent | 8638460540749ddb1beca9e9a68d655a6fe6df65 (diff) | |
| parent | d96299537e43681942ea272e00b0e529aa5b5fa4 (diff) | |
Merge branch 'master' into gfs2
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: |