From: Alexander Kappner agk@godking.net
commit d0a0852b9f81cf5f793bf2eae7336ed40a1a1815 upstream.
Upon module load, mmc_block allocates a bus with bus_registeri() in mmc_blk_init(). This reference never gets freed during module unload, which leads to subsequent re-insertions of the module fails and a WARN() splat is triggered.
Fix the bug by dropping the reference for the bus in mmc_blk_exit().
Signed-off-by: Alexander Kappner agk@godking.net Fixes: 97548575bef3 ("mmc: block: Convert RPMB to a character device") Cc: stable@vger.kernel.org Reviewed-by: Shawn Lin shawn.lin@rock-chips.com Signed-off-by: Ulf Hansson ulf.hansson@linaro.org Cc: Jisheng Zhang Jisheng.Zhang@synaptics.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/mmc/core/block.c | 1 + 1 file changed, 1 insertion(+)
--- a/drivers/mmc/core/block.c +++ b/drivers/mmc/core/block.c @@ -2904,6 +2904,7 @@ static void __exit mmc_blk_exit(void) mmc_unregister_driver(&mmc_driver); unregister_blkdev(MMC_BLOCK_MAJOR, "mmc"); unregister_chrdev_region(mmc_rpmb_devt, MAX_DEVICES); + bus_unregister(&mmc_rpmb_bus_type); }
module_init(mmc_blk_init);