mmc: atmel-mci: pio hang on block errors
authorTerry Barnaby <terry@beam.ltd.uk>
Mon, 8 Apr 2013 16:05:47 +0000 (12:05 -0400)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 8 May 2013 03:33:15 +0000 (20:33 -0700)
commitef9f29d9fbaac4f5aa560eff12a32e3b4f46b88f
tree0ca6697fb0cd1d408ad5b38d3b9f71efdb4c8534
parentf730f28bae56a56e2ec46ba3eb41bbddd4af57b5
mmc: atmel-mci: pio hang on block errors

commit bdbc5d0c60f3e9de3eeccf1c1a18bdc11dca62cc upstream.

The driver is doing, by default, multi-block reads. When a block error
occurs, card/block.c instigates a single block read: "mmcblk0: retrying
using single block read".  It leaves the sg chain intact and just changes
the length attribute for the first sg entry and the overall sg_len
parameter.  When atmci_read_data_pio is called to read the single block
of data it ignores the sg_len and expects to read more than 512 bytes as
it sees there are multiple items in the sg list. No more data comes as
the controller has only been commanded to get one block.

Signed-off-by: Terry Barnaby <terry@beam.ltd.uk>
Acked-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/mmc/host/atmel-mci.c