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mmc: block: fix RPMB device unregister ordering

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Since commit 7852028a35 ("mmc: block: register RPMB partition with
the RPMB subsystem"), each mmc RPMB partition is represented by two
device objects:
 - the mmc-owned device (`rpmb->dev`, backing the legacy /dev/mmcblkXrpmb
   char device) and
 - the rpmb-core device (`rdev`, backing /dev/rpmbN).

The child RPMB device holds a reference to its parent, so the
parent's release callback cannot be invoked if the child device
is still registered.

Remove rpmb_dev_unregister() from the parent release handler and
unregister the child RPMB device in the remove path before tearing
down the parent device.

Also delete the extra blank line between mmc_blk_remove_rpmb_part()
and {.

Fixes: 7852028a35 ("mmc: block: register RPMB partition with the RPMB subsystem")
Cc: stable@vger.kernel.org
Signed-off-by: Jiazi Li <jiazi.li@transsion.com>
Signed-off-by: Ao Sun <ao.sun@transsion.com>
Reviewed-by: Avri Altman <avri.altman@sandisk.com>
Signed-off-by: Ulf Hansson <ulfh@kernel.org>
This commit is contained in:
Ao Sun
2026-07-06 11:43:00 +00:00
committed by Ulf Hansson
parent 718178f524
commit 86152fef52
1 changed files with 1 additions and 2 deletions
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3
drivers/mmc/core/block.c
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@@ -2715,7 +2715,6 @@ static void mmc_blk_rpmb_device_release(struct device *dev)
{
struct mmc_rpmb_data *rpmb = dev_get_drvdata(dev);
rpmb_dev_unregister(rpmb->rdev);
mmc_blk_put(rpmb->md);
ida_free(&mmc_rpmb_ida, rpmb->id);
kfree(rpmb);
@@ -2930,8 +2929,8 @@ static int mmc_blk_alloc_rpmb_part(struct mmc_card *card,
}
static void mmc_blk_remove_rpmb_part(struct mmc_rpmb_data *rpmb)
{
rpmb_dev_unregister(rpmb->rdev);
cdev_device_del(&rpmb->chrdev, &rpmb->dev);
put_device(&rpmb->dev);
}