Avoid that running xfstests on top of the SRP initiator triggers
the call trace below. This patch has been tested by running the
following shell command on an initiator system that has access
to 3200 SRP LUNs:
/etc/init.d/multipathd start
while true; do
/etc/init.d/srpd start
sleep 400
/etc/init.d/srpd stop
for p in /sys/class/srp_remote_ports/*; do
echo 1 >$p/delete &
done
wait
dmsetup remove_all
done
BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffffa0918bb1>] srp_claim_req+0x31/0x90 [ib_srp]
Call Trace:
<IRQ>
[<ffffffffa091c096>] srp_process_rsp+0xa6/0x2a0 [ib_srp]
[<ffffffffa091c5ec>] srp_handle_recv+0x16c/0x340 [ib_srp]
[<ffffffffa091c7f9>] srp_recv_completion+0x39/0x70 [ib_srp]
[<ffffffffa0184442>] mlx4_ib_cq_comp+0x12/0x20 [mlx4_ib]
[<ffffffffa005e86d>] mlx4_cq_completion+0x3d/0x80 [mlx4_core]
[<ffffffffa006002b>] mlx4_eq_int+0x53b/0xd50 [mlx4_core]
[<ffffffffa006084f>] mlx4_msi_x_interrupt+0xf/0x20 [mlx4_core]
[<ffffffff810b67e0>] handle_irq_event_percpu+0x40/0x110
[<ffffffff810b68ef>] handle_irq_event+0x3f/0x70
[<ffffffff810ba829>] handle_edge_irq+0x79/0x120
[<ffffffff81007f2d>] handle_irq+0x5d/0x130
[<ffffffff810071ed>] do_IRQ+0x6d/0x130
[<ffffffff8151c104>] common_interrupt+0x84/0x84
<EOI>
Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Sagi Grimberg <sagi@xxxxxxxxxxx>
Cc: Laurence Oberman <loberman@xxxxxxxxxx>
---
drivers/infiniband/ulp/srp/ib_srp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index caefd1a..f4003f6 100644
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1814,7 +1814,8 @@ static void srp_process_rsp(struct srp_rdma_ch *ch, struct srp_rsp *rsp)
scmnd = scsi_host_find_tag(target->scsi_host, rsp->tag);
if (scmnd) {
req = (void *)scmnd->host_scribble;
- scmnd = srp_claim_req(ch, req, NULL, scmnd);
+ scmnd = req ? srp_claim_req(ch, req, NULL, scmnd) :
+ NULL;
}
if (!scmnd) {
shost_printk(KERN_ERR, target->scsi_host,
--
2.8.1
--
To unsubscribe from this list: send the line "unsubscribe linux-rdma" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
