[PATCH v2 11/13] scsi: fnic: Use fnic_lock to protect fnic structures in queuecommand

Karan Tilak Kumar
2023-10-27T18:04:08Z

fnic does not use host_lock. fnic uses fnic_lock.
Use fnic lock to protect fnic members in fnic_queuecommand.
Add log messages in error cases.

Reviewed-by: Sesidhar Baddela <sebaddel@cisco.com>
Reviewed-by: Arulprabhu Ponnusamy <arulponn@cisco.com>
Signed-off-by: Karan Tilak Kumar <kartilak@cisco.com>
---
drivers/scsi/fnic/fnic_scsi.c | 28 +++++++++++++++++++++++++---
1 file changed, 25 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/fnic/fnic_scsi.c b/drivers/scsi/fnic/fnic_scsi.c
index 9a1beb3e7269..ffdbdbfcdf57 100644
--- a/drivers/scsi/fnic/fnic_scsi.c
+++ b/drivers/scsi/fnic/fnic_scsi.c
@@ -424,14 +424,27 @@ static int fnic_queuecommand_lck(struct scsi_cmnd *sc)
int io_lock_acquired = 0;
struct fc_rport_libfc_priv *rp;

- if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED)))
+ spin_lock_irqsave(&fnic->fnic_lock, flags);
+
+ if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_IO_BLOCKED))) {
+ spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+ FNIC_SCSI_DBG(KERN_ERR, fnic->lport->host,
+ "fnic<%d>: %s: %d: fnic IO blocked flags: 0x%lx. Returning SCSI_MLQUEUE_HOST_BUSY\n",
+ fnic->fnic_num, __func__, __LINE__, fnic->state_flags);
return SCSI_MLQUEUE_HOST_BUSY;
+ }

- if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_FWRESET)))
+ if (unlikely(fnic_chk_state_flags_locked(fnic, FNIC_FLAGS_FWRESET))) {
+ spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+ FNIC_SCSI_DBG(KERN_ERR, fnic->lport->host,
+ "fnic<%d>: %s: %d: fnic flags: 0x%lx. Returning SCSI_MLQUEUE_HOST_BUSY\n",
+ fnic->fnic_num, __func__, __LINE__, fnic->state_flags);
return SCSI_MLQUEUE_HOST_BUSY;
+ }

rport = starget_to_rport(scsi_target(sc->device));
if (!rport) {
+ spin_unlock_irqrestore(&fnic->fnic_lock, flags);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"returning DID_NO_CONNECT for IO as rport is NULL\n");
sc->result = DID_NO_CONNECT << 16;
@@ -441,6 +454,7 @@ static int fnic_queuecommand_lck(struct scsi_cmnd *sc)

ret = fc_remote_port_chkready(rport);
if (ret) {
+ spin_unlock_irqrestore(&fnic->fnic_lock, flags);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"rport is not ready\n");
atomic64_inc(&fnic_stats->misc_stats.rport_not_ready);
@@ -451,6 +465,7 @@ static int fnic_queuecommand_lck(struct scsi_cmnd *sc)

rp = rport->dd_data;
if (!rp || rp->rp_state == RPORT_ST_DELETE) {
+ spin_unlock_irqrestore(&fnic->fnic_lock, flags);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"rport 0x%x removed, returning DID_NO_CONNECT\n",
rport->port_id);
@@ -462,6 +477,7 @@ static int fnic_queuecommand_lck(struct scsi_cmnd *sc)
}

if (rp->rp_state != RPORT_ST_READY) {
+ spin_unlock_irqrestore(&fnic->fnic_lock, flags);
FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
"rport 0x%x in state 0x%x, returning DID_IMM_RETRY\n",
rport->port_id, rp->rp_state);
@@ -471,11 +487,17 @@ static int fnic_queuecommand_lck(struct scsi_cmnd *sc)
return 0;
}

- if (lp->state != LPORT_ST_READY || !(lp->link_up))
+ if (lp->state != LPORT_ST_READY || !(lp->link_up)) {
+ spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+ FNIC_SCSI_DBG(KERN_ERR, fnic->lport->host,
+ "fnic<%d>: %s: %d: state not ready: %d/link not up: %d Returning HOST_BUSY\n",
+ fnic->fnic_num, __func__, __LINE__, lp->state, lp->link_up);
return SCSI_MLQUEUE_HOST_BUSY;
+ }

atomic_inc(&fnic->in_flight);

+ spin_unlock_irqrestore(&fnic->fnic_lock, flags);
fnic_priv(sc)->state = FNIC_IOREQ_NOT_INITED;
fnic_priv(sc)->flags = FNIC_NO_FLAGS;

--
2.31.1