tree 1c08c8128ac638606af144eec1338c864310a3d4
parent ebe80544338a393e94b65995120c3028c80abc62
author Ludovic Desroches <ludovic.desroches@atmel.com> 1366271579 +0200
committer Linus Torvalds <torvalds@linux-foundation.org> 1366300462 -0700

dmaengine: at_hdmac: fix race condition in atc_advance_work()

The BUG_ON() directive is triggered probably due to a latency
modification following inclusion of commit c10d73671ad3 ("softirq:
reduce latencies").  This condition has not been met before 3.9-rc1 and
doesn't trigger without this patch.

We now make sure that DMA channel is idle before calling
atc_complete_all() which makes the BUG_ON() "protection" useless.

Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com>
Acked-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>