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authorZhao Yakui <yakui.zhao@intel.com>2009-06-16 11:23:13 +0800
committerLen Brown <len.brown@intel.com>2009-06-23 23:38:41 -0400
commit86e437f077c68112edcb6854ec036ed7e3f9a7f3 (patch)
treeac6ec8b6ac4f96ce7ef7b5e9fa057099d7ce9af1 /init
parent07a2039b8eb0af4ff464efd3dfd95de5c02648c6 (diff)
downloadlinux-linaro-stable-86e437f077c68112edcb6854ec036ed7e3f9a7f3.tar.gz
ACPI: Add the reference count to avoid unloading ACPI video bus twice
Sometimes both acpi video and i915 driver are compiled as modules. And there exists the strict dependency between the two drivers. The acpi video bus will be unloaded in course of unloading the i915 driver. If we unload the acpi video driver, then the kernel oops will be triggered. Add the reference count to avoid unloading the ACPI video bus twice. The reference count should be checked before unregistering the acpi video bus. If the reference count is already zero, it won't unregister it again. And after the acpi video bus is already unregistered, the reference count will be set to zero. http://bugzilla.kernel.org/show_bug.cgi?id=13396 Signed-off-by: Zhao Yakui <yakui.zhao@intel.com> Acked-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
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