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9p: forgetting to cancel request on interrupted zero-copy RPC

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commit a84b69cb6e0a41e86bc593904faa6def3b957343 upstream.

If we'd already sent a request and decide to abort it, we *must*
issue TFLUSH properly and not just blindly reuse the tag, or
we'll get seriously screwed when response eventually arrives
and we confuse it for response to later request that had reused
the same tag.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Al Viro 2015-07-04 16:04:19 -04:00 committed by Zefan Li
parent 8d6a97ca45
commit 22b1c30792
1 changed files with 2 additions and 1 deletions
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1
net/9p/client.c
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@ -833,6 +833,7 @@ static struct p9_req_t *p9_client_zc_rpc(struct p9_client *c, int8_t type,
if (err < 0) {
if (err == -EIO)
c->status = Disconnected;
if (err != -ERESTARTSYS)
goto reterr;
}
if (req->status == REQ_STATUS_ERROR) {