linux-kernel - Re: [PATCH] scsi: sd: add runtime pm to open / release

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Date:   Tue, 30 Jun 2020 09:38:16 -0400
From:   Alan Stern <stern@...land.harvard.edu>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>
Cc:     Bart Van Assche <bvanassche@....org>, jejb@...ux.ibm.com,
        Can Guo <cang@...eaurora.org>, martin.petersen@...cle.com,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel@...i.sm
Subject: Re: [PATCH] scsi: sd: add runtime pm to open / release

On Tue, Jun 30, 2020 at 05:33:25AM +0200, Martin Kepplinger wrote:
> > Martin, does this fix the problem?
> > 
> 
> not quite: mounting works and resuming itself indeed happens now when
> copying a file, but the I/O itself doesn't, but says "device offline or
> changed":
> 
> [  167.167615] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result:
> hostbyte=0x00 driverbyte=0x08 cmd_age=0s
> [  167.167630] sd 0:0:0:0: [sda] tag#0 Sense Key : 0x6 [current]
> [  167.167638] sd 0:0:0:0: [sda] tag#0 ASC=0x28 ASCQ=0x0

That code stands for "Not-ready to ready transition".  It isn't really an 
error, just a notification.  The command should have been retried.

> [  167.167648] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 00 24
> c2 00 00 01 00
> [  167.167658] blk_update_request: I/O error, dev sda, sector 9410 op
> 0x0:(READ) flags 0x0 phys_seg 1 prio class 0
> [  167.178327] FAT-fs (sda1): FAT read failed (blocknr 1218)

And it should not have failed.  Martin or James, any ideas about this?

> [  167.183895] sd 0:0:0:0: [sda] tag#0 device offline or changed
> [  167.189695] blk_update_request: I/O error, dev sda, sector 5101888 op
> 0x0:(READ) flags 0x80700 phys_seg 8 prio class 0
> [  167.200510] sd 0:0:0:0: [sda] tag#0 device offline or changed
> 
> 
> and a later try to copy a file only yields (mostly my own debug prints):
> 
> 
> [  371.110798] blk_queue_enter: wait_event: pm=0
> [  371.300666] scsi_runtime_resume
> [  371.303834] scsi_runtime_resume
> [  371.307007] scsi_runtime_resume
> [  371.310213] sd 0:0:0:0: [sda] tag#0 device offline or changed
> [  371.316011] blk_update_request: I/O error, dev sda, sector 5101888 op
> 0x0:(READ) flags 0x0 phys_seg 1 prio class 0

No way to tell from the log what caused this error.

> [  372.560690] scsi_runtime_suspend
> [  372.563968] scsi_runtime_suspend
> [  372.567237] scsi_runtime_suspend
> 
> thanks Alan for taking the time and trying to fix this! you're close.
> what is missing?

At this point I don't know.

Alan Stern