PatchTrack

From: Heiko Stuebner <heiko@...> Date: Fri, 30 Dec 2011 23:16:19 +0100

Commit-Message

With this optional callback the driver is notified when the first page is entered into the pagelist and a new deferred_io call is scheduled. A possible use-case for this is runtime-pm. In the first_io call pm_runtime_get() could be called, which starts an asynchronous runtime_resume of the device. In the deferred_io callback a call to pm_runtime_barrier() makes the sure, the device is resumed by then and a pm_runtime_put() may put the device back to sleep. Also, some SoCs may use the runtime-pm system to determine if they are able to enter deeper idle states. Therefore it is necessary to keep the use-count from the first written page until the conclusion of the screen update, to prevent the system from going to sleep before completing the pending update. Two users of defio were using kmalloc to allocate the structure. These allocations are changed to kzalloc, to prevent uninitialised .first_io members in those drivers. Signed-off-by: Heiko Stübner <heiko@...>

Patch-Comment

changes since v1: convert fb_deferred_io kmalloc calls to kzalloc drivers/video/fb_defio.c | 4 ++++ drivers/video/smscufx.c | 2 +- drivers/video/udlfb.c | 2 +- include/linux/fb.h | 1 + 4 files changed, 7 insertions(+), 2 deletions(-)

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• 7 lines added
• 2 lines removed

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