Sergei Shtylyov c0da08882e mmc: tmio_mmc_dma: fix PIO fallback on SDHI ...

commit f936f9b67b upstream.

I'm testing SH-Mobile SDHI driver in DMA mode with  a new DMA controller  using
'bonnie++' and getting DMA error after which the tmio_mmc_dma.c code falls back
to PIO but all commands time out after that.  It turned out that the fallback
code calls tmio_mmc_enable_dma() with RX/TX channels already freed and pointers
to them cleared, so that the function bails out early instead  of clearing the
DMA bit in the CTL_DMA_ENABLE register. The regression was introduced by commit
162f43e31c (mmc: tmio: fix a deadlock).
Moving tmio_mmc_enable_dma() calls to the top of the PIO fallback code in
tmio_mmc_start_dma_{rx|tx}() helps.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Acked-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

2013-09-26 17:18:29 -07:00

..

card

block_device_operations->release() should return void

2013-05-07 02:16:21 -04:00

core

Merge tag 'mmc-updates-for-3.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc

2013-05-04 13:45:17 -07:00

host

mmc: tmio_mmc_dma: fix PIO fallback on SDHI

2013-09-26 17:18:29 -07:00

Kconfig

…

Makefile

mmc: sdhci-pci: add platform data

2012-01-11 23:58:47 -05:00