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IB/srp: Avoid that a cable pull can trigger a kernel crash

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This patch fixes the following kernel crash:

general protection fault: 0000 [#1] PREEMPT SMP
Workqueue: ib_mad2 timeout_sends [ib_core]
Call Trace:
 ib_sa_path_rec_callback+0x1c4/0x1d0 [ib_core]
 send_handler+0xb2/0xd0 [ib_core]
 timeout_sends+0x14d/0x220 [ib_core]
 process_one_work+0x200/0x630
 worker_thread+0x4e/0x3b0
 kthread+0x113/0x150

Fixes: commit aef9ec39c4 ("IB: Add SCSI RDMA Protocol (SRP) initiator")
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Cc: <stable@vger.kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2017-10-11 10:27:26 -07:00 • committed by Doug Ledford
parent dea262094c
commit 8a0d18c621
1 changed files with 19 additions and 6 deletions
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25
drivers/infiniband/ulp/srp/ib_srp.c
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@ -665,12 +665,19 @@ static void srp_path_rec_completion(int status,
static int srp_lookup_path(struct srp_rdma_ch *ch) static int srp_lookup_path(struct srp_rdma_ch *ch)
{ {
struct srp_target_port *target = ch->target; struct srp_target_port *target = ch->target;
int ret; int ret = -ENODEV;
ch->path.numb_path = 1; ch->path.numb_path = 1;
init_completion(&ch->done); init_completion(&ch->done);
/*
* Avoid that the SCSI host can be removed by srp_remove_target()
* before srp_path_rec_completion() is called.
*/
if (!scsi_host_get(target->scsi_host))
goto out;
ch->path_query_id = ib_sa_path_rec_get(&srp_sa_client, ch->path_query_id = ib_sa_path_rec_get(&srp_sa_client,
target->srp_host->srp_dev->dev, target->srp_host->srp_dev->dev,
target->srp_host->port, target->srp_host->port,
@ -684,18 +691,24 @@ static int srp_lookup_path(struct srp_rdma_ch *ch)
GFP_KERNEL, GFP_KERNEL,
srp_path_rec_completion, srp_path_rec_completion,
ch, &ch->path_query); ch, &ch->path_query);
if (ch->path_query_id < 0) ret = ch->path_query_id;
return ch->path_query_id; if (ret < 0)
goto put;
ret = wait_for_completion_interruptible(&ch->done); ret = wait_for_completion_interruptible(&ch->done);
if (ret < 0) if (ret < 0)
return ret; goto put;
if (ch->status < 0) ret = ch->status;
if (ret < 0)
shost_printk(KERN_WARNING, target->scsi_host, shost_printk(KERN_WARNING, target->scsi_host,
PFX "Path record query failed\n"); PFX "Path record query failed\n");
return ch->status; put:
scsi_host_put(target->scsi_host);
out:
return ret;
} }
static int srp_send_req(struct srp_rdma_ch *ch, bool multich) static int srp_send_req(struct srp_rdma_ch *ch, bool multich)