Re: [PATCH] sym53c500_cs PCMCIA SCSI driver (round 3 - the charm?)

Bob Tracy
2004-04-25T21:26:37Z

Russell King wrote:
> Hmm, so what happens if you're in the middle of a transaction, and
> you receive a CS_EVENT_CARD_RESET. What happens to the command in
> progress ?

Candidly, I don't know. A fair question to ask in return is, under
what circumstances might a PCMCIA driver see a CS_EVENT_CARD_RESET?

None of the existing PCMCIA SCSI drivers I saw do anything other than
reset the hardware: evidently the assumption is there's no command in
progress at that point, or we don't care. The nsp_cs driver toggles a
stop flag in the per-instance data to indicate the host is accepting
I/O: the flag is set to block I/O upon receipt of a suspend, physical
reset, or card removal event. The card reset code in the nsp_cs driver,
as in mine, is a subset of (fall-through case for) the resume logic.

Given the above, I'm tempted to believe the mid and/or upper driver
layers are handling the "command in progress" issue, but I haven't
delved into that code deeply enough to know.