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fix the deadlock in qib_fs 

get_sb_single() calls fill_super with superblock locked; calling
deactivate_super() will deadlock immedately.  Moreover, if fill_super
callback returns an error, get_sb_single() will release the reference
to superblock itself just fine.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-05-28 21:32:44 -04:00
parent 0abbb609ac
commit 971b2e8a3f
1 changed files with 1 additions and 3 deletions
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4
drivers/infiniband/hw/qib/qib_fs.c
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@ -542,10 +542,8 @@ static int qibfs_fill_super(struct super_block *sb, void *data, int silent)
list_for_each_entry_safe(dd, tmp, &qib_dev_list, list) { list_for_each_entry_safe(dd, tmp, &qib_dev_list, list) {
spin_unlock_irqrestore(&qib_devs_lock, flags); spin_unlock_irqrestore(&qib_devs_lock, flags);
ret = add_cntr_files(sb, dd); ret = add_cntr_files(sb, dd);
if (ret) { if (ret)
deactivate_super(sb);
goto bail; goto bail;
}
spin_lock_irqsave(&qib_devs_lock, flags); spin_lock_irqsave(&qib_devs_lock, flags);
} }