linux-wandboard

mmc: block: break out mmc_blk_rw_cmd_abort()

As a first step toward breaking apart the very complex function
mmc_blk_issue_rw_rq() we break out the command abort code.
This code assumes "ret" is != 0 and then repeatedly hammers
blk_end_request() until the request to the block layer to end
the request succeeds.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
(cherry picked from commit 4e1f780032c56894e8d7b6685b029b718588f483)

Conflicts:
	drivers/mmc/core/block.c