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Subject[049/145] SCSI: qla2xxx: Obtain proper host structure during response-queue processing.
2.6.32-stable review patch.  If anyone has any objections, please let me know.

----------------
From: Anirban Chakraborty <anirban.chakraborty@qlogic.com>

commit a67093d46e3caed1a42d694a7de452b61db30562 upstream.

Original code incorrectly assumed only status-type-0
IOCBs would be queued to the response-queue, and thus all
entries would safely reference a VHA from the IOCB
'handle.'

Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>


---
drivers/scsi/qla2xxx/qla_gbl.h | 1 -
drivers/scsi/qla2xxx/qla_isr.c | 29 +----------------------------
drivers/scsi/qla2xxx/qla_mid.c | 6 +++++-
3 files changed, 6 insertions(+), 30 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_gbl.h
+++ b/drivers/scsi/qla2xxx/qla_gbl.h
@@ -453,6 +453,5 @@ extern void qla24xx_wrt_req_reg(struct q
extern void qla25xx_wrt_req_reg(struct qla_hw_data *, uint16_t, uint16_t);
extern void qla25xx_wrt_rsp_reg(struct qla_hw_data *, uint16_t, uint16_t);
extern void qla24xx_wrt_rsp_reg(struct qla_hw_data *, uint16_t, uint16_t);
-extern struct scsi_qla_host * qla25xx_get_host(struct rsp_que *);

#endif /* _QLA_GBL_H */
--- a/drivers/scsi/qla2xxx/qla_isr.c
+++ b/drivers/scsi/qla2xxx/qla_isr.c
@@ -2018,7 +2018,7 @@ qla24xx_msix_rsp_q(int irq, void *dev_id

spin_lock_irq(&ha->hardware_lock);

- vha = qla25xx_get_host(rsp);
+ vha = pci_get_drvdata(ha->pdev);
qla24xx_process_response_queue(vha, rsp);
if (!ha->mqenable) {
WRT_REG_DWORD(&reg->hccr, HCCRX_CLR_RISC_INT);
@@ -2357,30 +2357,3 @@ int qla25xx_request_irq(struct rsp_que *
msix->rsp = rsp;
return ret;
}
-
-struct scsi_qla_host *
-qla25xx_get_host(struct rsp_que *rsp)
-{
- srb_t *sp;
- struct qla_hw_data *ha = rsp->hw;
- struct scsi_qla_host *vha = NULL;
- struct sts_entry_24xx *pkt;
- struct req_que *req;
- uint16_t que;
- uint32_t handle;
-
- pkt = (struct sts_entry_24xx *) rsp->ring_ptr;
- que = MSW(pkt->handle);
- handle = (uint32_t) LSW(pkt->handle);
- req = ha->req_q_map[que];
- if (handle < MAX_OUTSTANDING_COMMANDS) {
- sp = req->outstanding_cmds[handle];
- if (sp)
- return sp->fcport->vha;
- else
- goto base_que;
- }
-base_que:
- vha = pci_get_drvdata(ha->pdev);
- return vha;
-}
--- a/drivers/scsi/qla2xxx/qla_mid.c
+++ b/drivers/scsi/qla2xxx/qla_mid.c
@@ -638,11 +638,15 @@ failed:

static void qla_do_work(struct work_struct *work)
{
+ unsigned long flags;
struct rsp_que *rsp = container_of(work, struct rsp_que, q_work);
struct scsi_qla_host *vha;
+ struct qla_hw_data *ha = rsp->hw;

- vha = qla25xx_get_host(rsp);
+ spin_lock_irqsave(&rsp->hw->hardware_lock, flags);
+ vha = pci_get_drvdata(ha->pdev);
qla24xx_process_response_queue(vha, rsp);
+ spin_unlock_irqrestore(&rsp->hw->hardware_lock, flags);
}

/* create response queue */



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