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

Alan Stern
2020-07-29T14:57:00Z

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