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SubjectRe: [PATCH] scsi: libiscsi: fix shifting of DID_REQUEUE host byte
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Use wrapper functions to advertize their use in an attempt to avoid 
wrong shifting in the future?

On 10/09/2017 01:33 PM, Johannes Thumshirn wrote:
> The SCSI host byte should be shifted left by 16 in order to have
> scsi_decide_disposition() do the right thing (.i.e. requeue the command).
>
> Signed-off-by: Johannes Thumshirn <jthumshirn@suse.de>
> Fixes: 661134ad3765 ("[SCSI] libiscsi, bnx2i: make bound ep check common")
> Cc: Lee Duncan <lduncan@suse.com>
> Cc: Hannes Reinecke <hare@suse.de>
> Cc: Bart Van Assche <Bart.VanAssche@sandisk.com>
> Cc: Chris Leech <cleech@redhat.com>
> ---
> drivers/scsi/libiscsi.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
> index bd4605a34f54..9cba4913b43c 100644
> --- a/drivers/scsi/libiscsi.c
> +++ b/drivers/scsi/libiscsi.c
> @@ -1728,7 +1728,7 @@ int iscsi_queuecommand(struct Scsi_Host *host, struct scsi_cmnd *sc)
>
> if (test_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx)) {
> reason = FAILURE_SESSION_IN_RECOVERY;
> - sc->result = DID_REQUEUE;
> + sc->result = DID_REQUEUE << 16;

not sure if this really wants to reset the other parts of result, but if
so (and they are not 0 already anyway), preceed the set_host_byte() by:
sc->result = 0;

set_host_byte(sc, DID_REQUEUE);

> goto fault;
> }
>

--
Mit freundlichen Grüßen / Kind regards
Steffen Maier

Linux on z Systems Development

IBM Deutschland Research & Development GmbH
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