diff options
| author |   Lv Zheng <lv.zheng@intel.com> | 2017-08-16 15:29:49 +0800 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2017-08-17 20:52:19 +0200 |
| commit | 98529b9272e06a7767034fb8a32e43cdecda240a (patch) | |
| tree | 46bfeaed8d0d4e5c086d070d9cb5c20821770c66 /drivers/acpi/internal.h | |
| parent | Linux 4.13-rc5 (diff) | |
| download | linux-dev-98529b9272e06a7767034fb8a32e43cdecda240a.tar.xz linux-dev-98529b9272e06a7767034fb8a32e43cdecda240a.zip | |
ACPI: EC: Fix regression related to wrong ECDT initialization order
Commit 2a5708409e4e (ACPI / EC: Fix a gap that ECDT EC cannot handle
EC events) introduced acpi_ec_ecdt_start(), but that function is
invoked before acpi_ec_query_init(), which is too early. This causes
the kernel to crash if an EC event occurs after boot, when ec_query_wq
is not valid:
BUG: unable to handle kernel NULL pointer dereference at 0000000000000102
...
Workqueue: events acpi_ec_event_handler
task: ffff9f539790dac0 task.stack: ffffb437c0e10000
RIP: 0010:__queue_work+0x32/0x430
Normally, the DSDT EC should always be valid, so acpi_ec_ecdt_start()
is actually a no-op in the majority of cases. However, commit
c712bb58d827 (ACPI / EC: Add support to skip boot stage DSDT probe)
caused the probing of the DSDT EC as the "boot EC" to be skipped when
the ECDT EC is valid and uncovered the bug.
Fix this issue by invoking acpi_ec_ecdt_start() after acpi_ec_query_init()
in acpi_ec_init().
Link: https://jira01.devtools.intel.com/browse/LCK-4348
Fixes: 2a5708409e4e (ACPI / EC: Fix a gap that ECDT EC cannot handle EC events)
Fixes: c712bb58d827 (ACPI / EC: Add support to skip boot stage DSDT probe)
Reported-by: Wang Wendy <wendy.wang@intel.com>
Tested-by: Feng Chenzhou <chenzhoux.feng@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/internal.h')
| -rw-r--r-- | drivers/acpi/internal.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index 58dd7ab3c653..3f5af4d7a739 100644 --- a/drivers/acpi/internal.h +++ b/drivers/acpi/internal.h @@ -185,7 +185,6 @@ typedef int (*acpi_ec_query_func) (void *data); int acpi_ec_init(void); int acpi_ec_ecdt_probe(void); int acpi_ec_dsdt_probe(void); -int acpi_ec_ecdt_start(void); void acpi_ec_block_transactions(void); void acpi_ec_unblock_transactions(void); int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, |