mmc: block: fix boot partition switch error path

In the case of a switch error, do not update partition config as though
the switch succeeded, and ensure blk_end_request is called on the
failed request.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Andrei Warkentin <andrey.warkentin@gmail.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 13 insertions, 3 deletions

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 66c7596c5546..d7eb2c082336 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -447,18 +447,23 @@ static inline int mmc_blk_part_switch(struct mmc_card *card,
 {
         int ret;
         struct mmc_blk_data *main_md = mmc_get_drvdata(card);
+
         if (main_md->part_curr == md->part_type)
                 return 0;
 
         if (mmc_card_mmc(card)) {
-                card->ext_csd.part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
-                card->ext_csd.part_config |= md->part_type;
+                u8 part_config = card->ext_csd.part_config;
+
+                part_config &= ~EXT_CSD_PART_CONFIG_ACC_MASK;
+                part_config |= md->part_type;
 
                 ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
-                                 EXT_CSD_PART_CONFIG, card->ext_csd.part_config,
+                                 EXT_CSD_PART_CONFIG, part_config,
                                  card->ext_csd.part_time);
                 if (ret)
                         return ret;
+
+                card->ext_csd.part_config = part_config;
         }
 
         main_md->part_curr = md->part_type;
@@ -1273,6 +1278,11 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)
 
         ret = mmc_blk_part_switch(card, md);
         if (ret) {
+                if (req) {
+                        spin_lock_irq(&md->lock);
+                        __blk_end_request_all(req, -EIO);
+                        spin_unlock_irq(&md->lock);
+                }
                 ret = 0;
                 goto out;
         }