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mmc: core: Prevent bus reference leak in mmc_blk_init()

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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 <[email protected]>
Fixes: 97548575be ("mmc: block: Convert RPMB to a character device")
Cc: <[email protected]>
Reviewed-by: Shawn Lin <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
This commit is contained in:
Alexander Kappner 2018-03-28 15:18:31 -07:00 • committed by Ulf Hansson
commit d0a0852b9f
1 changed files with 1 additions and 0 deletions
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1
drivers/mmc/core/block.c
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@ -3080,6 +3080,7 @@ 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);