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char: misc: Fix improper and inaccurate error code returned by misc_init()

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misc_init() returns -EIO for __register_chrdev() invocation failure, but:

- -EIO is for I/O error normally, but __register_chrdev() does not do I/O.
- -EIO can not cover various error codes returned by __register_chrdev().

Fix by returning error code of __register_chrdev().

Signed-off-by: Zijun Hu <zijun.hu@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250620-fix_mischar-v1-3-6c2716bbf1fa@oss.qualcomm.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Zijun Hu 2025-06-20 22:35:20 +08:00 committed by Greg Kroah-Hartman
parent 7aecbbdf86
commit 0ef1fe4bc3
1 changed files with 2 additions and 2 deletions
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4
drivers/char/misc.c
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@ -296,8 +296,8 @@ static int __init misc_init(void)
if (err)
goto fail_remove;
err = -EIO;
if (__register_chrdev(MISC_MAJOR, 0, MINORMASK + 1, "misc", &misc_fops))
err = __register_chrdev(MISC_MAJOR, 0, MINORMASK + 1, "misc", &misc_fops);
if (err < 0)
goto fail_printk;
return 0;