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Subject[PATCH 07/12] qla2xxx: Convert to host_lock less w/ interrupts disabled externally
Date
From: Nicholas Bellinger <nab@linux-iscsi.org>

This patch converts qla2xxx to run in host_lock less mode with the new
IRQ_DISABLE_SCSI_QCMD() that disables interrupts while calling ->queuecommand()
dispatch. It also drops the legacy host_lock unlock optimization.

Signed-off-by: Nicholas A. Bellinger <nab@linux-iscsi.org>
---
drivers/scsi/qla2xxx/qla_os.c | 11 +++--------
1 files changed, 3 insertions(+), 8 deletions(-)

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 2c0876c..c6cdfeb 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -534,7 +534,8 @@ qla2x00_get_new_sp(scsi_qla_host_t *vha, fc_port_t *fcport,
}

static int
-qla2xxx_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
+qla2xxx_queuecommand_irq_disable(struct scsi_cmnd *cmd,
+ void (*done)(struct scsi_cmnd *))
{
scsi_qla_host_t *vha = shost_priv(cmd->device->host);
fc_port_t *fcport = (struct fc_port *) cmd->device->hostdata;
@@ -544,7 +545,6 @@ qla2xxx_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)
srb_t *sp;
int rval;

- spin_unlock_irq(vha->host->host_lock);
if (ha->flags.eeh_busy) {
if (ha->flags.pci_channel_io_perm_failure)
cmd->result = DID_NO_CONNECT << 16;
@@ -585,8 +585,6 @@ qla2xxx_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *)
if (rval != QLA_SUCCESS)
goto qc24_host_busy_free_sp;

- spin_lock_irq(vha->host->host_lock);
-
return 0;

qc24_host_busy_free_sp:
@@ -594,21 +592,18 @@ qc24_host_busy_free_sp:
mempool_free(sp, ha->srb_mempool);

qc24_host_busy_lock:
- spin_lock_irq(vha->host->host_lock);
return SCSI_MLQUEUE_HOST_BUSY;

qc24_target_busy:
- spin_lock_irq(vha->host->host_lock);
return SCSI_MLQUEUE_TARGET_BUSY;

qc24_fail_command:
- spin_lock_irq(vha->host->host_lock);
done(cmd);

return 0;
}

-static DEF_SCSI_QCMD(qla2xxx_queuecommand)
+static IRQ_DISABLE_SCSI_QCMD(qla2xxx_queuecommand)


/*
--
1.7.3.4


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