Re: kernel 5.0 blk_clear_pm_only triggers a warning during resume

[Jisheng Zhang <Jisheng.Zhang@synaptics.com>]

On Wed, 13 Mar 2019 10:18:41 +0800 Jisheng Zhang wrote:

> On Tue, 12 Mar 2019 07:58:19 -0700 Bart Van Assche wrote:
> 
> > CAUTION: Email originated externally, do not click links or open attachments unless you recognize the sender and know the content is safe.
> > 
> > 
> > On Tue, 2019-03-12 at 05:35 +0000, Jisheng Zhang wrote:  
> > > I got below warning during resume:
> > >
> > > [  673.658888] sd 0:0:0:0: [sda] Starting disk
> > > [  673.658899] WARNING: CPU: 3 PID: 1039 at blk_clear_pm_only+0x2a/0x30
> > > [  673.658902] CPU: 3 PID: 1039 Comm: kworker/u8:49 Not tainted 5.0.0+ #1
> > > [  673.658902] sd 2:0:0:0: [sdb] Starting disk
> > > [  673.658903] Hardware name: LENOVO 4180F42/4180F42, BIOS 83ET75WW (1.45 ) 05/10/2013
> > > [  673.658906] Workqueue: events_unbound async_run_entry_fn
> > > [  673.658909] RIP: 0010:blk_clear_pm_only+0x2a/0x30
> > > [  673.658911] Code: b8 ff ff ff ff f0 0f c1 87 80 00 00 00 83 e8 01 78 18 74 01 c3 48 81 c7 58 05 00 00 31 c9 31 d2 be 03 00 00 00 e9 36 97 e2 ff <0f> 0b c3 0f 1f 00 48 81 c7 90 00 00 00 e9 04 01
> > > 3a 00 0f 1f 40 00
> > > [  673.658911] RSP: 0000:ffff8881115a7e48 EFLAGS: 00010297
> > > [  673.658913] RAX: 00000000ffffffff RBX: ffff888118d42800 RCX: ffff8881194c9a00
> > > [  673.658914] RDX: ffff888118ab1a00 RSI: 0000000000000000 RDI: ffff888117e70000
> > > [  673.658915] RBP: ffff888118d42f90 R08: 0000000000000004 R09: 000000000001f900
> > > [  673.658915] R10: 0000000045698a8e R11: 0000000000000010 R12: ffff888119421000
> > > [  673.658916] R13: 0000000000000000 R14: ffff88800030ea80 R15: 0ffff88811942100
> > > [  673.658918] FS:  0000000000000000(0000) GS:ffff88811a180000(0000) knlGS:0000000000000000
> > > [  673.658918] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > > [  673.658919] CR2: 0000000000000000 CR3: 000000000200c001 CR4: 00000000000606e0
> > > [  673.658920] Call Trace:
> > > [  673.658924]  ? scsi_device_resume+0x28/0x50
> > > [  673.658926]  ? scsi_dev_type_resume+0x2b/0x80
> > > [  673.658927]  ? async_run_entry_fn+0x2c/0xd0
> > > [  673.658930]  ? process_one_work+0x1f0/0x3f0
> > > [  673.658932]  ? worker_thread+0x28/0x3c0
> > > [  673.658933]  ? process_one_work+0x3f0/0x3f0
> > > [  673.658935]  ? kthread+0x10c/0x130
> > > [  673.658936]  ? __kthread_create_on_node+0x150/0x150
> > > [  673.658938]  ? ret_from_fork+0x1f/0x30
> > > [  673.658940] ---[ end trace ce18772de33e283e ]---    
> > 
> > Hi Jisheng,  
> 
> Hi Bart,
> 
> > 
> > Is this something that occurred once or is this something that you can reproduce  
> 
> It's 100% reproduced on my home's laptop PC.
> 
> > easily? In the latter case, can you verify whether the patch below is sufficient
> > to make this warning disappear?  
> 
> Thanks for the patch. I will test it this night.

Good news. The patch fix the warning. So 

Tested-by: Jisheng Zhang <Jisheng.Zhang@synaptics.com>

Thanks

> 
> > 
> > Thanks,
> > 
> > Bart.
> > 
> > ---
> >  drivers/scsi/scsi_lib.c | 6 ++++--
> >  1 file changed, 4 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> > index f3f24dfd8fd5..33e1a72d47fa 100644
> > --- a/drivers/scsi/scsi_lib.c
> > +++ b/drivers/scsi/scsi_lib.c
> > @@ -2540,8 +2540,10 @@ void scsi_device_resume(struct scsi_device *sdev)
> >          * device deleted during suspend)
> >          */
> >         mutex_lock(&sdev->state_mutex);
> > -       sdev->quiesced_by = NULL;
> > -       blk_clear_pm_only(sdev->request_queue);
> > +       if (sdev->quiesced_by) {
> > +               sdev->quiesced_by = NULL;
> > +               blk_clear_pm_only(sdev->request_queue);
> > +       }
> >         if (sdev->sdev_state == SDEV_QUIESCE)
> >                 scsi_device_set_state(sdev, SDEV_RUNNING);
> >         mutex_unlock(&sdev->state_mutex);
> >   
>