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NFS: Fix wakeup of __nfs_lookup_revalidate() in unblock_revalidate()

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Use store_release_wake_up() to add the appropriate memory barrier before
calling wake_up_var(&dentry->d_fsdata).

Reported-by: Lukáš Hejtmánek<xhejtman@ics.muni.cz>
Suggested-by: Santosh Pradhan <santosh.pradhan@gmail.com>
Link: https://lore.kernel.org/all/18945D18-3EDB-4771-B019-0335CE671077@ics.muni.cz/
Fixes: 99bc9f2eb3 ("NFS: add barriers when testing for NFS_FSDATA_BLOCKED")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2025-07-18 16:15:27 -07:00
parent f5b3108e6a
commit 1db3a48e83
1 changed files with 1 additions and 3 deletions
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4
fs/nfs/dir.c
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@ -1828,9 +1828,7 @@ static void block_revalidate(struct dentry *dentry)
static void unblock_revalidate(struct dentry *dentry)
{
/* store_release ensures wait_var_event() sees the update */
smp_store_release(&dentry->d_fsdata, NULL);
wake_up_var(&dentry->d_fsdata);
store_release_wake_up(&dentry->d_fsdata, NULL);
}
/*