auxdisplay: charlcd: cancel backlight work on registration failure

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With CONFIG_CHARLCD_BL_FLASH, charlcd_init() schedules bl_work before
charlcd_register() calls misc_register(). If registration fails, the
caller frees the charlcd object while delayed work still contains its
address.

Add charlcd_deinit() to cancel the delayed work and turn the backlight
off. Use it for both registration rollback and normal unregistration.

Fixes: 39f8ea4672 ("auxdisplay: charlcd: Extract character LCD core from misc/panel")
Cc: stable@vger.kernel.org
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Hongyan Xu <getshell@seu.edu.cn>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

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Hongyan Xu 2026-08-15 18:59:50 +08:00 • committed by Andy Shevchenko

parent 95545ddcb3

commit e3e3bf4091

1 changed files with 14 additions and 7 deletions

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drivers/auxdisplay/charlcd.c

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