On 01/08/2018 07:50 PM, Bart Van Assche wrote:
> The previous two patches guarantee that srp_queuecommand() does not get
> invoked while reconnecting occurs. Hence remove the code from
> srp_queuecommand() that prevents command queueing while reconnecting.
> This patch avoids that the following can appear in the kernel log:
>
> BUG: sleeping function called from invalid context at kernel/locking/mutex.c:747
> in_atomic(): 1, irqs_disabled(): 0, pid: 5600, name: scsi_eh_9
> 1 lock held by scsi_eh_9/5600:
> #0: (rcu_read_lock){....}, at: [<00000000cbb798c7>] __blk_mq_run_hw_queue+0xf1/0x1e0
> Preemption disabled at:
> [<00000000139badf2>] __blk_mq_delay_run_hw_queue+0x78/0xf0
> CPU: 9 PID: 5600 Comm: scsi_eh_9 Tainted: G W 4.15.0-rc4-dbg+ #1
> Hardware name: Dell Inc. PowerEdge R720/0VWT90, BIOS 2.5.4 01/22/2016
> Call Trace:
> dump_stack+0x67/0x99
> ___might_sleep+0x16a/0x250 [ib_srp]
> __mutex_lock+0x46/0x9d0
> srp_queuecommand+0x356/0x420 [ib_srp]
> scsi_dispatch_cmd+0xf6/0x3f0
> scsi_queue_rq+0x4a8/0x5f0
> blk_mq_dispatch_rq_list+0x73/0x440
> blk_mq_sched_dispatch_requests+0x109/0x1a0
> __blk_mq_run_hw_queue+0x131/0x1e0
> __blk_mq_delay_run_hw_queue+0x9a/0xf0
> blk_mq_run_hw_queue+0xc0/0x1e0
> blk_mq_start_hw_queues+0x2c/0x40
> scsi_run_queue+0x18e/0x2d0
> scsi_run_host_queues+0x22/0x40
> scsi_error_handler+0x18d/0x5f0
> kthread+0x11c/0x140
> ret_from_fork+0x24/0x30
>
> Signed-off-by: Bart Van Assche <bart.vanassche@xxxxxxx>
> Cc: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
> Cc: Doug Ledford <dledford@xxxxxxxxxx>
> ---
> drivers/infiniband/ulp/srp/ib_srp.c | 21 ++-------------------
> 1 file changed, 2 insertions(+), 19 deletions(-)
>
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Cheers,
Hannes
--
Dr. Hannes Reinecke Teamlead Storage & Networking
hare@xxxxxxx +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
