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| author | Hans de Goede <hdegoede@redhat.com> | 2015-06-16 16:27:54 +0200 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2015-06-19 01:11:14 +0200 |
| commit | 2a8b18e9fb650ab5c637005a7506045c46ed2b0e (patch) | |
| tree | 637a4660e3ba3e89e8c3bea3b709712c4bcb333e /drivers/platform/x86/acer-wmi.c | |
| parent | 7ee33baabcae765e1eda73b988a62fe102c0ce76 (diff) | |
| download | linux-2a8b18e9fb650ab5c637005a7506045c46ed2b0e.tar.gz linux-2a8b18e9fb650ab5c637005a7506045c46ed2b0e.tar.bz2 linux-2a8b18e9fb650ab5c637005a7506045c46ed2b0e.zip | |
ACPI / video: Fix acpi_video _register vs _unregister_backlight race
It is possible for a native backlight driver to load while
acpi_video_register is running, which may lead to
acpi_video_unregister_backlight being called while acpi_video_register
is running and the 2 racing against eachother.
The register_count variable protects against this, but not in a thread
safe manner, this commit adds locking to make this thread safe.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Darren Hart <dvhart@linux.intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/platform/x86/acer-wmi.c')
0 files changed, 0 insertions, 0 deletions