fuse: request_end(): do once
When the connection is aborted it is possible that request_end() will be called twice. Use atomic test and set to do the actual ending only once. test_and_set_bit() also provides the necessary barrier semantics so no explicit smp_wmb() is necessary. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Reviewed-by: Ashish Samant <ashish.samant@oracle.com>
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@ -384,14 +384,18 @@ __releases(fc->lock)
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{
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struct fuse_iqueue *fiq = &fc->iq;
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void (*end) (struct fuse_conn *, struct fuse_req *) = req->end;
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if (test_and_set_bit(FR_FINISHED, &req->flags)) {
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spin_unlock(&fc->lock);
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return;
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}
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req->end = NULL;
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spin_lock(&fiq->waitq.lock);
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list_del_init(&req->intr_entry);
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spin_unlock(&fiq->waitq.lock);
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WARN_ON(test_bit(FR_PENDING, &req->flags));
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WARN_ON(test_bit(FR_SENT, &req->flags));
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smp_wmb();
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set_bit(FR_FINISHED, &req->flags);
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if (test_bit(FR_BACKGROUND, &req->flags)) {
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clear_bit(FR_BACKGROUND, &req->flags);
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if (fc->num_background == fc->max_background)
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