tmp_suning_uos_patched/drivers/mmc/card
Ding Wang 29535f7b79 mmc: card: Fixup request missing in mmc_blk_issue_rw_rq
The current handler of MMC_BLK_CMD_ERR in mmc_blk_issue_rw_rq function
may cause new coming request permanent missing when the ongoing
request (previoulsy started) complete end.

The problem scenario is as follows:
(1) Request A is ongoing;
(2) Request B arrived, and finally mmc_blk_issue_rw_rq() is called;
(3) Request A encounters the MMC_BLK_CMD_ERR error;
(4) In the error handling of MMC_BLK_CMD_ERR, suppose mmc_blk_cmd_err()
    end request A completed and return zero. Continue the error handling,
    suppose mmc_blk_reset() reset device success;
(5) Continue the execution, while loop completed because variable ret
    is zero now;
(6) Finally, mmc_blk_issue_rw_rq() return without processing request B.

The process related to the missing request may wait that IO request
complete forever, possibly crashing the application or hanging the system.

Fix this issue by starting new request when reset success.

Signed-off-by: Ding Wang <justin.wang@spreadtrum.com>
Fixes: 67716327ee ("mmc: block: add eMMC hardware reset support")
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
2015-06-16 08:58:36 +02:00
..
block.c mmc: card: Fixup request missing in mmc_blk_issue_rw_rq 2015-06-16 08:58:36 +02:00
Kconfig tty: Added a CONFIG_TTY option to allow removal of TTY 2013-01-18 16:15:27 -08:00
Makefile mmc: Makefile: Fix EXTRA_CFLAGS assignment 2010-10-23 21:11:15 +08:00
mmc_test.c mmc: mmc-test: use swap() in mmc_test_nonblock_transfer() 2015-06-01 09:07:08 +02:00
queue.c mmc: queue: use swap() in mmc_queue_thread() 2015-06-15 10:26:29 +02:00
queue.h mmc: block: Retry errored data requests when re-tuning is needed 2015-06-01 09:06:59 +02:00
sdio_uart.c mmc: Convert pr_warning to pr_warn 2014-09-24 10:13:09 +02:00