From: Russell King - ARM Linux <linux@arm.linux.org.uk>
Date: Thu, 27 Jan 2011 12:32:53 +0000 (+0000)
Subject: DMA: PL08x: fix infinite wait when terminating transfers
X-Git-Tag: v2.6.38-rc5~7^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fb526210b2b961b5d590b89fd8f45c0ca5769688;p=pandora-kernel.git

DMA: PL08x: fix infinite wait when terminating transfers

If we try to pause a channel when terminating a transfer, we could end
up spinning for it to become inactive indefinitely, and can result in
an uninterruptible wait requiring a reset to recover from.

Terminating a transfer is supposed to take effect immediately, but may
result in data loss.

To make this clear, rename the function to pl08x_terminate_phy_chan().
Also, make sure it is always consistently called - with the spinlock
held and IRQs disabled, and ensure that the TC and ERR interrupt status
is always cleared.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
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