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devtmpfs: fix the dangling pointer of global devtmpfsd thread

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When the devtmpfs fails to mount, a dangling pointer still remains in
global. Specifically, the err variable is passed by a pointer to the
devtmpfsd. When the devtmpfsd exits, it sets the error and completes the
setup_done. In this situation, the thread pointer is not set to null.
After the devtmpfsd exited, the devtmpfs can wakes up the destroyed
devtmpfsd thread by wake_up_process if a device change event comes.

Signed-off-by: Yangxi Xiang <xyangxi5@gmail.com>
Link: https://lore.kernel.org/r/20220627120409.11174-1-xyangxi5@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yangxi Xiang 2022-06-27 20:04:09 +08:00 committed by Greg Kroah-Hartman
parent 38a523a294
commit 31c779f293
1 changed files with 1 additions and 0 deletions
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drivers/base/devtmpfs.c
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@ -482,6 +482,7 @@ int __init devtmpfs_init(void)
if (err) {
printk(KERN_ERR "devtmpfs: unable to create devtmpfs %i\n", err);
unregister_filesystem(&dev_fs_type);
thread = NULL;
return err;
}