1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 20135a5de748..2cfb963d9f37 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -72,6 +72,7 @@ MODULE_ALIAS("mmc:block");
 #define MMC_BLK_TIMEOUT_MS  (10 * 1000)
 #define MMC_SANITIZE_REQ_TIMEOUT 240000
 #define MMC_EXTRACT_INDEX_FROM_ARG(x) ((x & 0x00FF0000) >> 16)
+#define MMC_EXTRACT_VALUE_FROM_ARG(x) ((x & 0x0000FF00) >> 8)
 
 #define mmc_req_rel_wr(req)     ((req->cmd_flags & REQ_FUA) && \
                                   (rq_data_dir(req) == WRITE))
@@ -587,6 +588,24 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
         }
 
         /*
+         * Make sure the cache of the PARTITION_CONFIG register and
+         * PARTITION_ACCESS bits is updated in case the ioctl ext_csd write
+         * changed it successfully.
+         */
+        if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_PART_CONFIG) &&
+            (cmd.opcode == MMC_SWITCH)) {
+                struct mmc_blk_data *main_md = dev_get_drvdata(&card->dev);
+                u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg);
+
+                /*
+                 * Update cache so the next mmc_blk_part_switch call operates
+                 * on up-to-date data.
+                 */
+                card->ext_csd.part_config = value;
+                main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
+        }
+
+        /*
          * According to the SD specs, some commands require a delay after
          * issuing the command.
          */