From: Krzysztof Kozlowski Date: Thu, 21 May 2015 00:34:09 +0000 (+0900) Subject: dmaengine: pl330: Fix hang on dmaengine_terminate_all on certain boards X-Git-Tag: omap-for-v4.2/wakeirq-drivers-v2^2~2^2~19^2~1 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=81cc6edc08705ac0146fe6ac14a0982a31ce6f3d;p=pandora-kernel.git dmaengine: pl330: Fix hang on dmaengine_terminate_all on certain boards The pl330 device could hang infinitely on certain boards when DMA channels are terminated. It was caused by lack of runtime resume when executing pl330_terminate_all() which calls the _stop() function. _stop() accesses device register and can loop infinitely while checking for device state. The hang was confirmed by Dinh Nguyen on Altera SOCFPGA Cyclone V board during boot. It can be also triggered with: $ echo 1 > /sys/module/dmatest/parameters/iterations $ echo dma1chan0 > /sys/module/dmatest/parameters/channel $ echo 1 > /sys/module/dmatest/parameters/run $ sleep 1 $ cat /sys/module/dmatest/parameters/run Reported-by: Dinh Nguyen Signed-off-by: Krzysztof Kozlowski Fixes: ae43b3289186 ("ARM: 8202/1: dmaengine: pl330: Add runtime Power Management support v12") Cc: Tested-by: Dinh Nguyen Signed-off-by: Vinod Koul --- Reading git-diff-tree failed