From: Maarten Lankhorst Date: Thu, 27 Jun 2013 11:38:25 +0000 (+0200) Subject: drm/mgag200: do not attempt to acquire a reservation while in an interrupt handler X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a06b9a74c73750835b8fd69fe0d0bd7877da111b;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git drm/mgag200: do not attempt to acquire a reservation while in an interrupt handler Mutexes should not be acquired in interrupt context. While the trylock fastpath is arguably safe on all implementations, the slowpath unlock path definitely isn't. Signed-off-by: Maarten Lankhorst Signed-off-by: Dave Airlie --- diff --git a/drivers/gpu/drm/mgag200/mgag200_fb.c b/drivers/gpu/drm/mgag200/mgag200_fb.c index 5da824ce9ba1..964f58cee5ea 100644 --- a/drivers/gpu/drm/mgag200/mgag200_fb.c +++ b/drivers/gpu/drm/mgag200/mgag200_fb.c @@ -27,7 +27,7 @@ static void mga_dirty_update(struct mga_fbdev *mfbdev, struct mgag200_bo *bo; int src_offset, dst_offset; int bpp = (mfbdev->mfb.base.bits_per_pixel + 7)/8; - int ret; + int ret = -EBUSY; bool unmap = false; bool store_for_later = false; int x2, y2; @@ -41,7 +41,8 @@ static void mga_dirty_update(struct mga_fbdev *mfbdev, * then the BO is being moved and we should * store up the damage until later. */ - ret = mgag200_bo_reserve(bo, true); + if (!in_interrupt()) + ret = mgag200_bo_reserve(bo, true); if (ret) { if (ret != -EBUSY) return;