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Date:   Wed, 29 Jul 2020 10:56:56 -0400
From:   Alan Stern <stern@rowland.harvard.edu>
To:     "Martin K. Petersen" <martin.petersen@oracle.com>
Cc:     Martin Kepplinger <martin.kepplinger@puri.sm>,
        Bart Van Assche <bvanassche@acm.org>, jejb@linux.ibm.com,
        Can Guo <cang@codeaurora.org>, linux-scsi@vger.kernel.org,
        linux-kernel@vger.kernel.org, kernel@puri.sm
Subject: Re: [PATCH] scsi: sd: add runtime pm to open / release
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On Wed, Jul 29, 2020 at 10:44:26AM -0400, Martin K. Petersen wrote:
> 
> Alan,
> 
> >> [   77.474632] sd 0:0:0:0: [sda] tag#0 UNKNOWN(0x2003) Result:
> >> hostbyte=0x00 driverbyte=0x08 cmd_age=0s
> >> [   77.474647] sd 0:0:0:0: [sda] tag#0 Sense Key : 0x6 [current]
> >> [   77.474655] sd 0:0:0:0: [sda] tag#0 ASC=0x28 ASCQ=0x0
> >> [   77.474667] sd 0:0:0:0: [sda] tag#0 CDB: opcode=0x28 28 00 00 00 60
> >> 40 00 00 01 00
> >
> > This error report comes from the SCSI layer, not the block layer.
> 
> This the device telling us that the media (SD card?) has changed.

Ah yes, thank you.  I knew that SK=6 ASC=0x28 meant "Not Ready to Ready 
Transition", but I had forgotten the "(Media May Have Changed)" part.

This makes sense and is a reasonable thing to see, since many SD card 
readers lose track of whether or not the card has been changed when they 
go into suspend.

Alan Stern