mmc: sh_mmcif: fix I/O errors
authorGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Wed, 12 Dec 2012 14:38:17 +0000 (15:38 +0100)
committerChris Ball <cjb@laptop.org>
Mon, 11 Feb 2013 18:28:38 +0000 (13:28 -0500)
commit276bc96b2abfa2a6bb219aa4eda13c4c331c53eb
tree4edc707d40597d431acfe8dd99ae1f9d62a78574
parent90f1cb438e33bb88036649665c2165155561b54f
mmc: sh_mmcif: fix I/O errors

The INT_BUFWEN IRQ often arrives with other bits set too. If they are not
cleared, an additional IRQ can be triggered, sometimes also after the MMC
request has already been completed. This leads to block I/O errors. Earlier
Teppei Kamijou also observed these additional interrupts and proposed to
explicitly wait for them. This patch chooses an alternative approach of
clearing all active bits immediately, when processing the main interrupt.

Reported-by: Teppei Kamijou <teppei.kamijou.yb@renesas.com>
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
drivers/mmc/host/sh_mmcif.c