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drm/msm/rd: Fix FIFO-full deadlock
authorRob Clark <robdclark@chromium.org>
Sun, 7 Aug 2022 16:09:01 +0000 (09:09 -0700)
committerRob Clark <robdclark@chromium.org>
Mon, 15 Aug 2022 17:19:53 +0000 (10:19 -0700)
commit174974d8463b77c2b4065e98513adb204e64de7d
treebb3c3a06489282ee0bc29322a422d80f75b78c14tree | snapshot
parent02b9f2636209beb843ca501d47f7fddc8792b2d7commit | diff
drm/msm/rd: Fix FIFO-full deadlock

If the previous thing cat'ing $debugfs/rd left the FIFO full, then
subsequent open could deadlock in rd_write() (because open is blocked,
not giving a chance for read() to consume any data in the FIFO).  Also
it is generally a good idea to clear out old data from the FIFO.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/496706/
Link: https://lore.kernel.org/r/20220807160901.2353471-2-robdclark@gmail.com
drivers/gpu/drm/msm/msm_rd.c diff | blob | history
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