[PATCH for-next v2] IB/core: Fix for core panic

Dennis Dalessandro
2017-08-31T16:30:34Z

From: Alex Estrin <alex.estrin-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

Build with the latest patches resulted in panic:
11384.486289] BUG: unable to handle kernel NULL pointer dereference at
(null)
[11384.486293] IP: (null)
[11384.486295] PGD 0
[11384.486295] P4D 0
[11384.486296]
[11384.486299] Oops: 0010 [#1] SMP
......... snip ......
[11384.486401] CPU: 0 PID: 968 Comm: kworker/0:1H Tainted: G W O
4.13.0-a-stream-20170825 #1
[11384.486402] Hardware name: Intel Corporation S2600WT2R/S2600WT2R,
BIOS SE5C610.86B.01.01.0014.121820151719 12/18/2015
[11384.486418] Workqueue: ib-comp-wq ib_cq_poll_work [ib_core]
[11384.486419] task: ffff880850579680 task.stack: ffffc90007fec000
[11384.486420] RIP: 0010: (null)
[11384.486420] RSP: 0018:ffffc90007fef970 EFLAGS: 00010206
[11384.486421] RAX: ffff88084cfe8000 RBX: ffff88084dce4000 RCX:
ffffc90007fef978
[11384.486422] RDX: 0000000000000000 RSI: 0000000000000001 RDI:
ffff88084cfe8000
[11384.486422] RBP: ffffc90007fefab0 R08: 0000000000000000 R09:
ffff88084dce4080
[11384.486423] R10: ffffffffa02d7f60 R11: 0000000000000000 R12:
ffff88105af65a00
[11384.486423] R13: ffff88084dce4000 R14: 000000000000c000 R15:
000000000000c000
[11384.486424] FS: 0000000000000000(0000) GS:ffff88085f400000(0000)
knlGS:0000000000000000
[11384.486425] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[11384.486425] CR2: 0000000000000000 CR3: 0000000001c09000 CR4:
00000000001406f0
[11384.486426] Call Trace:
[11384.486431] ? is_valid_mcast_lid.isra.21+0xfb/0x110 [ib_core]
[11384.486436] ib_attach_mcast+0x6f/0xa0 [ib_core]
[11384.486441] ipoib_mcast_attach+0x81/0x190 [ib_ipoib]
[11384.486443] ipoib_mcast_join_complete+0x354/0xb40 [ib_ipoib]
[11384.486448] mcast_work_handler+0x330/0x6c0 [ib_core]
[11384.486452] join_handler+0x101/0x220 [ib_core]
[11384.486455] ib_sa_mcmember_rec_callback+0x54/0x80 [ib_core]
[11384.486459] recv_handler+0x3a/0x60 [ib_core]
[11384.486462] ib_mad_recv_done+0x423/0x9b0 [ib_core]
[11384.486466] __ib_process_cq+0x5d/0xb0 [ib_core]
[11384.486469] ib_cq_poll_work+0x20/0x60 [ib_core]
[11384.486472] process_one_work+0x149/0x360
[11384.486474] worker_thread+0x4d/0x3c0
[11384.486487] kthread+0x109/0x140
[11384.486488] ? rescuer_thread+0x380/0x380
[11384.486489] ? kthread_park+0x60/0x60
[11384.486490] ? kthread_park+0x60/0x60
[11384.486493] ret_from_fork+0x25/0x30
[11384.486493] Code: Bad RIP value.
[11384.486493] Code: Bad RIP value.
[11384.486496] RIP: (null) RSP: ffffc90007fef970
[11384.486497] CR2: 0000000000000000
[11384.486531] ---[ end trace b1acec6fb4ff6e75 ]---
[11384.532133] Kernel panic - not syncing: Fatal exception
[11384.536541] Kernel Offset: disabled
[11384.969491] ---[ end Kernel panic - not syncing: Fatal exception
[11384.976875] sched: Unexpected reschedule of offline CPU#1!
[11384.983646] ------------[ cut here ]------------

Rdma device driver may not have implemented (*get_link_layer)()
so it can not be called directly. Should use appropriate helper function.

Reviewed-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
Fixes: 523633359224 ("IB/core: Fix the validations of a multicast LID in attach or detach operations")
Reviewed-by: Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Alex Estrin <alex.estrin-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>

---
changes from v1:
* Incorporate Leon's comment
* Update commit message with Yuval review-by
* Add panic trace to commit message
---
drivers/infiniband/core/verbs.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index ee9e27d..de57d6c 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1646,7 +1646,7 @@ static bool is_valid_mcast_lid(struct ib_qp *qp, u16 lid)
*/
if (!ib_query_qp(qp, &attr, IB_QP_STATE | IB_QP_PORT, &init_attr)) {
if (attr.qp_state >= IB_QPS_INIT) {
- if (qp->device->get_link_layer(qp->device, attr.port_num) !=
+ if (rdma_port_get_link_layer(qp->device, attr.port_num) !=
IB_LINK_LAYER_INFINIBAND)
return true;
goto lid_check;
@@ -1655,7 +1655,7 @@ static bool is_valid_mcast_lid(struct ib_qp *qp, u16 lid)

/* Can't get a quick answer, iterate over all ports */
for (port = 0; port < qp->device->phys_port_cnt; port++)
- if (qp->device->get_link_layer(qp->device, port) !=
+ if (rdma_port_get_link_layer(qp->device, port) !=
IB_LINK_LAYER_INFINIBAND)
num_eth_ports++;

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