From: Matthew Wilcox (Oracle) willy@infradead.org
commit 9480b4e75b7108ee68ecf5bc6b4bd68e8031c521 upstream.
If ->readpage returns an error, it has already unlocked the page.
Fixes: 5e929b33c393 ("CacheFiles: Handle truncate unlocking the page we're reading") Cc: stable@vger.kernel.org Signed-off-by: Matthew Wilcox (Oracle) willy@infradead.org Signed-off-by: David Howells dhowells@redhat.com Signed-off-by: Linus Torvalds torvalds@linux-foundation.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- fs/cachefiles/rdwr.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/fs/cachefiles/rdwr.c +++ b/fs/cachefiles/rdwr.c @@ -121,7 +121,7 @@ static int cachefiles_read_reissue(struc _debug("reissue read"); ret = bmapping->a_ops->readpage(NULL, backpage); if (ret < 0) - goto unlock_discard; + goto discard; }
/* but the page may have been read before the monitor was installed, so @@ -138,6 +138,7 @@ static int cachefiles_read_reissue(struc
unlock_discard: unlock_page(backpage); +discard: spin_lock_irq(&object->work_lock); list_del(&monitor->op_link); spin_unlock_irq(&object->work_lock);