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[PATCH] IB: allow NULL sa_query callbacks 

Check if a client passes a NULL callback into an SA query, and if so, never
call back.  This fixes an oops if someone unloads ib_ipoib and ib_sa in
rapid succession.  ib_ipoib does an MCMember delete with a NULL callback
and 0 timeout on unload, which is usually fine since the delete completes
successfully.  However, if ib_sa is unloaded immediately afterwards, the
delete will be canceled and ib_sa will try to call the (now already
unloaded) ib_ipoib module back with the cancel completion, which triggers
the oops.

Signed-off-by: Roland Dreier <roland@topspin.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Roland Dreier 2005-05-25 12:31:29 -07:00 committed by Linus Torvalds
parent 4f60fdf613
commit e4f50f003d
1 changed files with 18 additions and 17 deletions
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7
drivers/infiniband/core/sa_query.c
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@ -587,7 +587,7 @@ int ib_sa_path_rec_get(struct ib_device *device, u8 port_num,
init_mad(query->sa_query.mad, agent);
query->sa_query.callback = ib_sa_path_rec_callback;
query->sa_query.callback = callback ? ib_sa_path_rec_callback : NULL;
query->sa_query.release = ib_sa_path_rec_release;
query->sa_query.port = port;
query->sa_query.mad->mad_hdr.method = IB_MGMT_METHOD_GET;
@ -663,7 +663,7 @@ int ib_sa_mcmember_rec_query(struct ib_device *device, u8 port_num,
init_mad(query->sa_query.mad, agent);
query->sa_query.callback = ib_sa_mcmember_rec_callback;
query->sa_query.callback = callback ? ib_sa_mcmember_rec_callback : NULL;
query->sa_query.release = ib_sa_mcmember_rec_release;
query->sa_query.port = port;
query->sa_query.mad->mad_hdr.method = method;
@ -698,6 +698,7 @@ static void send_handler(struct ib_mad_agent *agent,
if (!query)
return;
if (query->callback)
switch (mad_send_wc->status) {
case IB_WC_SUCCESS:
/* No callback -- already got recv */
@ -736,7 +737,7 @@ static void recv_handler(struct ib_mad_agent *mad_agent,
query = idr_find(&query_idr, mad_recv_wc->wc->wr_id);
spin_unlock_irqrestore(&idr_lock, flags);
if (query) {
if (query && query->callback) {
if (mad_recv_wc->wc->status == IB_WC_SUCCESS)
query->callback(query,
mad_recv_wc->recv_buf.mad->mad_hdr.status ?