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mtd: ubi: Release device reference on busy detach

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ubi_detach_mtd_dev() obtains a device reference through ubi_get_device()
before checking whether the UBI device is busy. The busy return path drops
ubi->ref_count but leaves the device reference held, so the device object
cannot be released after a later detach.

Drop the device reference before returning -EBUSY.

Fixes: 7e84c961b2 ("mtd: ubi: introduce pre-removal notification for UBI volumes")
Signed-off-by: Yuho Choi <dbgh9129@gmail.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
This commit is contained in:
Yuho Choi 2026-08-07 16:45:50 -04:00 committed by Richard Weinberger
parent 5b0a6b554e
commit 31dd710cd8
1 changed files with 1 additions and 0 deletions
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drivers/mtd/ubi/build.c
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@ -1105,6 +1105,7 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
ubi->ref_count -= 1;
if (ubi->ref_count) {
if (!anyway) {
put_device(&ubi->dev);
spin_unlock(&ubi_devices_lock);
return -EBUSY;
}