linux/drivers/mmc
Sergei Shtylyov f936f9b67b mmc: tmio_mmc_dma: fix PIO fallback on SDHI
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>
Cc: stable@vger.kernel.org # 3.1+
Signed-off-by: Chris Ball <cjb@laptop.org>
2013-08-24 23:38:15 -04:00
..
card mmc: fix null pointer use in mmc_blk_remove_req 2013-08-24 23:22:04 -04:00
core mmc: core: Set data timeout for mmc bus test commands (CMD14 and CMD19). 2013-08-24 23:25:36 -04:00
host mmc: tmio_mmc_dma: fix PIO fallback on SDHI 2013-08-24 23:38:15 -04:00
Kconfig mmc: explicitly mention SDIO support in Kconfig 2008-10-12 11:04:36 +02:00
Makefile mmc: sdhci-pci: add platform data 2012-01-11 23:58:47 -05:00