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Date: Tue, 10 Oct 2017 16:02:04 +0000
From: Bart Van Assche <Bart.VanAssche@....com>
To: "jthumshirn@...e.de" <jthumshirn@...e.de>,
"martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC: "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"tj@...nel.org" <tj@...nel.org>,
Bart Van Assche <Bart.VanAssche@....com>,
"maier@...ux.vnet.ibm.com" <maier@...ux.vnet.ibm.com>,
"stern@...land.harvard.edu" <stern@...land.harvard.edu>,
"oneukum@...e.com" <oneukum@...e.com>
Subject: Re: [PATCH] scsi: use set_host_byte instead of open-coding it
On Tue, 2017-10-10 at 17:29 +0200, Johannes Thumshirn wrote:
> Call set_host_byte() instead of open-coding it.
>
> Converted using this simple Coccinelle spatch
>
> <SmPL>
> @@
> local idexpression struct scsi_cmnd *c;
> expression E1;
> @@
>
> - c->result = E1 << 16;
> + set_host_byte(c, E1);
> </SmPL>
This is useful but I think we should take this a step further. How
about the following approach:
- Introduce four enumeration types - one for the msg byte codes, one
for the host byte codes, one for the driver byte codes and one for
SCSI sense codes.
- Update the signatures of functions that store or extract these four
bytes.
- Change the data type of scsi_cmnd.result into something that makes
regular assignments trigger a compiler error.
I'm proposing this because there are several drivers that do not assign the
SCSI host byte correctly:
$ git grep -nH '>result = DID_' | grep -v '<< *16' | grep -v ': \*'
drivers/scsi/ips.c:953: scsi_cmd->result = DID_ERROR;
drivers/scsi/ips.c:2657: SC->result = DID_OK;
drivers/scsi/libiscsi.c:1731: sc->result = DID_REQUEUE;
drivers/scsi/qla2xxx/qla_bsg.c:152: bsg_reply->result = DID_OK;
drivers/scsi/qla2xxx/qla_bsg.c:167: bsg_reply->result = DID_OK;
drivers/scsi/qla2xxx/qla_bsg.c:184: bsg_reply->result = DID_OK;
drivers/scsi/qla2xxx/qla_bsg.c:236: bsg_reply->result = DID_OK;
drivers/scsi/qla2xxx/qla_bsg.c:976: bsg_reply->result = DID_OK;
drivers/scsi/qla2xxx/qla_bsg.c:1078: bsg_reply->result = DID_OK;
drivers/scsi/qla2xxx/qla_bsg.c:1261: bsg_reply->result = DID_OK;
drivers/scsi/qla2xxx/qla_bsg.c:1375: bsg_reply->result = DID_OK;
drivers/scsi/qla2xxx/qla_bsg.c:1480: bsg_reply->result = DID_OK;
drivers/scsi/qla2xxx/qla_bsg.c:1516: bsg_reply->result = DID_OK;
drivers/scsi/qlogicpti.c:1049: Cmnd->result = DID_BUS_BUSY;
drivers/scsi/stex.c:615: cmd->result = DID_NO_CONNECT;
Bart.
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