On Thu, Jul 02, 2015 at 05:43:32PM +0100, Al Viro wrote:
> req->tc->tag = tag-1;
> + if (req->status != REQ_STATUS_IDLE)
> + pr_err("using tag %d with odd status (%d)", tag, req->status);
Should be tag - 1 here, actually.
diff --git a/net/9p/client.c b/net/9p/client.c
index 6f4c4c8..9719886 100644
--- a/net/9p/client.c
+++ b/net/9p/client.c
@@ -248,6 +248,9 @@ p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
/* check again since original check was outside of lock */
while (tag >= c->max_tag) {
row = (tag / P9_ROW_MAXTAG);
+
+ WARN_ON_ONCE(c->reqs[row]); // are we about to leak?
+
c->reqs[row] = kcalloc(P9_ROW_MAXTAG,
sizeof(struct p9_req_t), GFP_ATOMIC);
@@ -286,6 +289,8 @@ p9_tag_alloc(struct p9_client *c, u16 tag, unsigned int max_size)
p9pdu_reset(req->rc);
req->tc->tag = tag-1;
+ if (req->status != REQ_STATUS_IDLE)
+ pr_err("using tag %d with odd status (%d)", tag - 1, req->status);
req->status = REQ_STATUS_ALLOC;
return req;
@@ -425,6 +430,8 @@ void p9_client_cb(struct p9_client *c, struct p9_req_t *req, int status)
* the other thread wakes up will indeed be seen by the waiting side.
*/
smp_wmb();
+ if (req->status == REQ_STATUS_IDLE)
+ pr_err("late delivery, tag %d already freed", req->tc->tag);
req->status = status;
wake_up(req->wq);
@@ -693,6 +700,10 @@ static struct p9_req_t *p9_client_prepare_req(struct p9_client *c,
tag = p9_idpool_get(c->tagpool);
if (tag < 0)
return ERR_PTR(-ENOMEM);
+ if (WARN_ON_ONCE(tag != (u16)tag)) { // wrapped around?
+ p9_idpool_put(tag, c->tagpool);
+ return ERR_PTR(-ENOMEM);
+ }
}
req = p9_tag_alloc(c, tag, req_size);
@@ -1647,7 +1658,10 @@ p9_client_write(struct p9_fid *fid, u64 offset, struct iov_iter *from, int *err)
if (*err) {
trace_9p_protocol_dump(clnt, req->rc);
p9_free_req(clnt, req);
+ break;
}
+ if (rsize < count)
+ pr_err("mismatched reply [tag = %d]\n", req->tc->tag);
p9_debug(P9_DEBUG_9P, "<<< RWRITE count %d\n", count);
--
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