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Subject[PATCH] qla2xxx: Do not consume srb greedily
Date
qla2xx_process_get_sp_from_handle() will clear the slot which the
current srb is stored. So this function has a side effect. Therefore,
we can't use it in qla24xx_process_mbx_iocb_response() to check
for consistency and later again in qla24xx_mbx_iocb_entry().

Let's move the consistency check directly into
qla24xx_mbx_iocb_entry() and avoid the double call or any open coding
of the qla2xx_process_get_sp_from_handle() functionality.

Fixes: 31a3271ff11b ("scsi: qla2xxx: Handle incorrect entry_type entries")
Signed-off-by: Daniel Wagner <dwagner@suse.de>
---
Hi,

Brown bag for me please. My test patch had an open coded version of
qla2xx_process_get_sp_from_handle() which didn't consume the srb. When
I prepared it for sending it out, I 'cleaned' it up by using
qla2xx_process_get_sp_from_handle() twice.

Sorry,
Daniel

drivers/scsi/qla2xxx/qla_isr.c | 42 +++++++++++++++---------------------------
1 file changed, 15 insertions(+), 27 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
index 96811354f78a..2baba87c4e0c 100644
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -1839,6 +1839,7 @@ qla24xx_mbx_iocb_entry(scsi_qla_host_t *vha, struct req_que *req,
struct mbx_24xx_entry *pkt)
{
const char func[] = "MBX-IOCB2";
+ struct qla_hw_data *ha = vha->hw;
srb_t *sp;
struct srb_iocb *si;
u16 sz, i;
@@ -1848,6 +1849,18 @@ qla24xx_mbx_iocb_entry(scsi_qla_host_t *vha, struct req_que *req,
if (!sp)
return;

+ if (sp->type == SRB_SCSI_CMD ||
+ sp->type == SRB_NVME_CMD ||
+ sp->type == SRB_TM_CMD) {
+ ql_log(ql_log_warn, vha, 0x509d,
+ "Inconsistent event entry type %d\n", sp->type);
+ if (IS_P3P_TYPE(ha))
+ set_bit(FCOE_CTX_RESET_NEEDED, &vha->dpc_flags);
+ else
+ set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
+ return;
+ }
+
si = &sp->u.iocb_cmd;
sz = min(ARRAY_SIZE(pkt->mb), ARRAY_SIZE(sp->u.iocb_cmd.u.mbx.in_mb));

@@ -3406,32 +3419,6 @@ void qla24xx_nvme_ls4_iocb(struct scsi_qla_host *vha,
sp->done(sp, comp_status);
}

-static void qla24xx_process_mbx_iocb_response(struct scsi_qla_host *vha,
- struct rsp_que *rsp, struct sts_entry_24xx *pkt)
-{
- struct qla_hw_data *ha = vha->hw;
- srb_t *sp;
- static const char func[] = "MBX-IOCB2";
-
- sp = qla2x00_get_sp_from_handle(vha, func, rsp->req, pkt);
- if (!sp)
- return;
-
- if (sp->type == SRB_SCSI_CMD ||
- sp->type == SRB_NVME_CMD ||
- sp->type == SRB_TM_CMD) {
- ql_log(ql_log_warn, vha, 0x509d,
- "Inconsistent event entry type %d\n", sp->type);
- if (IS_P3P_TYPE(ha))
- set_bit(FCOE_CTX_RESET_NEEDED, &vha->dpc_flags);
- else
- set_bit(ISP_ABORT_NEEDED, &vha->dpc_flags);
- return;
- }
-
- qla24xx_mbx_iocb_entry(vha, rsp->req, (struct mbx_24xx_entry *)pkt);
-}
-
/**
* qla24xx_process_response_queue() - Process response queue entries.
* @vha: SCSI driver HA context
@@ -3539,7 +3526,8 @@ void qla24xx_process_response_queue(struct scsi_qla_host *vha,
(struct abort_entry_24xx *)pkt);
break;
case MBX_IOCB_TYPE:
- qla24xx_process_mbx_iocb_response(vha, rsp, pkt);
+ qla24xx_mbx_iocb_entry(vha, rsp->req,
+ (struct mbx_24xx_entry *)pkt);
break;
case VP_CTRL_IOCB_TYPE:
qla_ctrlvp_completed(vha, rsp->req,
--
2.16.4
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