Re: [PATCH v3 35/77] ncr5380: Dont wait for BUS FREE after disconnect

[Hannes Reinecke]

On 12/22/2015 02:18 AM, Finn Thain wrote:
> When there is a queued command and no connected command, NCR5380_select()
> is called and arbitration begins. The chip waits for BUS FREE once the
> MR_ARBITRATE bit in the mode register is enabled. That means there is
> no need to wait for BUS FREE after disconnecting.
>
> There is presently no polling for BUS FREE after sending an ABORT or
> other message that might lead to disconnection. It only happens after
> COMMAND COMPLETE or DISCONNECT messages, which seems inconsistent.
> Remove the polling for !BSY in the COMMAND COMPLETE and DISCONNECT
> cases.
>
> BTW, the comments say "avoid nasty timeouts" and perhaps BUS FREE polling
> was somehow helpful back in Linux v0.99.14u, when it was introduced.
> The relevant timeout is presently 1 second (for bus arbitration).
>
> Signed-off-by: Finn Thain <fthain@xxxxxxxxxxxxxxxxxxx>
>
> ---
>   drivers/scsi/NCR5380.c       |    7 -------
>   drivers/scsi/atari_NCR5380.c |   11 -----------
>   2 files changed, 18 deletions(-)
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke		      zSeries & Storage
hare@xxxxxxx			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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