From: Ludovic Desroches <ludovic.desroches@atmel.com>
Date: Thu, 18 Apr 2013 07:52:59 +0000 (+0200)
Subject: dmaengine: at_hdmac: fix race condition in atc_advance_work()
X-Git-Tag: v3.9-rc8~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d202f05158442396033f416df376f8ece1f563df;p=pandora-kernel.git

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>
---

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