char: scx200_gpio: check cdev_add() return value

cdev_add() can fail. The driver currently ignores the return value and
reports probe success even when the cdev was not registered, leaving a
chrdev region allocated with no working file operations.

Check the return value, emit an error, and unwind the chrdev region and
platform device on failure.

Fixes: 635adb6cd25c ("[PATCH] scx200_gpio: use 1 cdev for N minors, not N for N")
Signed-off-by: Linkai Gong <gonglinkai@kylinos.cn>
Link: https://patch.msgid.link/20260803015450.2050900-1-gonglinkai@kylinos.cn
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

0 files changed, 0 insertions, 0 deletions