diff options
| author | Len Brown <len.brown@intel.com> | 2006-08-16 19:16:58 -0400 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2006-08-16 19:23:00 -0400 |
| commit | d68909f4c3eee09c13d4e5c86512c6c075553dbd (patch) | |
| tree | 4153c598662ea952903329c6eced0acbbfcfb7b6 /drivers/acpi/osl.c | |
| parent | b5240b32b9b2b75917c478d768191862a2b190cc (diff) | |
ACPI: avoid irqrouter_resume might_sleep oops on resume from S4
__might_sleep+0x8e/0x93
acpi_os_wait_semaphore+0x50/0xa3
acpi_ut_acquire_mutex+0x28/0x6a
acpi_ns_get_node+0x46/0x88
acpi_ns_evaluate+0x2d/0xfc
acpi_rs_set_srs_method_data+0xc5/0xe1
acpi_set_current_resources+0x31/0x3f
acpi_pci_link_set+0xfc/0x1a5
irqrouter_resume+0x48/0x5f
and
__might_sleep+0x8e/0x93
kmem_cache_alloc+0x2a/0x8f
acpi_evaluate_integer+0x32/0x96
acpi_bus_get_status+0x30/0x84
acpi_pci_link_set+0x12a/0x1a5
irqrouter_resume+0x48/0x5f
http://bugzilla.kernel.org/show_bug.cgi?id=6810
Signed-off-by: Len Brown <len.brown@intel.com>
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: |