[linux-yocto] [PATCH 1/4] mmc: block: Always switch back to main area after RPMB access

[California Sullivan]

From: Adrian Hunter <adrian.hunter at intel.com>

commit 3c866568aff7dcfc0bbd5ffc7fcc34fa8f100f67 upstream.

In preparation to support the use of the RPMB partition with transfer
modes that might require re-tuning, always switch back to the main
area after RPMB access.

RPMB is accessible only via IOCTL so only those paths are affected.

Signed-off-by: Adrian Hunter <adrian.hunter at intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson at linaro.org>
Signed-off-by: California Sullivan <california.l.sullivan at intel.com>
---
 drivers/mmc/card/block.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 553113e..cbc4211 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -624,6 +624,10 @@ static int mmc_blk_ioctl_cmd(struct block_device *bdev,
 
 	ioc_err = __mmc_blk_ioctl_cmd(card, md, idata);
 
+	/* Always switch back to main area after RPMB access */
+	if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
+		mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
+
 	mmc_put_card(card);
 
 	err = mmc_blk_ioctl_copy_to_user(ic_ptr, idata);
@@ -689,6 +693,10 @@ static int mmc_blk_ioctl_multi_cmd(struct block_device *bdev,
 	for (i = 0; i < num_of_cmds && !ioc_err; i++)
 		ioc_err = __mmc_blk_ioctl_cmd(card, md, idata[i]);
 
+	/* Always switch back to main area after RPMB access */
+	if (md->area_type & MMC_BLK_DATA_AREA_RPMB)
+		mmc_blk_part_switch(card, dev_get_drvdata(&card->dev));
+
 	mmc_put_card(card);
 
 	/* copy to user if data and response */
-- 
2.5.5