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scsi: pm8001: Simplify pm8001_task_exec()

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The main part of the pm8001_task_exec() function uses a do {} while(0) loop
that is useless and only makes the code harder to read. Remove this
loop. The unnecessary local variable t is also removed.

Additionally, avoid repeatedly declaring "struct task_status_struct *ts" to
handle error cases by declaring this variable for the entire function
scope. This allows simplifying the error cases, and together with the
addition of blank lines make the code more readable.

Finally, handling of the running_req counter is fixed to avoid decrementing
it without a corresponding incrementation in the case of an invalid task
protocol.

Link: https://lore.kernel.org/r/20220220031810.738362-29-damien.lemoal@opensource.wdc.com
Reviewed-by: John Garry <john.garry@huawei.com>
Reviewed-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Damien Le Moal 2022-02-20 12:18:07 +09:00 committed by Martin K. Petersen
parent f91767a35f
commit e29c47fe89
1 changed files with 83 additions and 97 deletions
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180
drivers/scsi/pm8001/pm8001_sas.c
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@ -375,128 +375,114 @@ static int sas_find_local_port_id(struct domain_device *dev)
*/
int pm8001_queue_command(struct sas_task *task, gfp_t gfp_flags)
{
struct task_status_struct *ts = &task->task_status;
enum sas_protocol task_proto = task->task_proto;
struct domain_device *dev = task->dev;
struct pm8001_device *pm8001_dev = dev->lldd_dev;
struct pm8001_hba_info *pm8001_ha;
struct pm8001_device *pm8001_dev;
struct pm8001_port *port = NULL;
struct sas_task *t = task;
struct pm8001_ccb_info *ccb;
u32 rc = 0, n_elem = 0;
unsigned long flags = 0;
enum sas_protocol task_proto = t->task_proto;
struct sas_tmf_task *tmf = task->tmf;
int is_tmf = !!task->tmf;
unsigned long flags;
u32 n_elem = 0;
int rc = 0;
if (!dev->port) {
struct task_status_struct *tsm = &t->task_status;
tsm->resp = SAS_TASK_UNDELIVERED;
tsm->stat = SAS_PHY_DOWN;
if (dev->dev_type != SAS_SATA_DEV)
t->task_done(t);
return 0;
}
pm8001_ha = pm8001_find_ha_by_dev(task->dev);
if (pm8001_ha->controller_fatal_error) {
struct task_status_struct *ts = &t->task_status;
ts->resp = SAS_TASK_UNDELIVERED;
t->task_done(t);
ts->stat = SAS_PHY_DOWN;
if (dev->dev_type != SAS_SATA_DEV)
task->task_done(task);
return 0;
}
pm8001_ha = pm8001_find_ha_by_dev(dev);
if (pm8001_ha->controller_fatal_error) {
ts->resp = SAS_TASK_UNDELIVERED;
task->task_done(task);
return 0;
}
pm8001_dbg(pm8001_ha, IO, "pm8001_task_exec device\n");
spin_lock_irqsave(&pm8001_ha->lock, flags);
do {
dev = t->dev;
pm8001_dev = dev->lldd_dev;
port = &pm8001_ha->port[sas_find_local_port_id(dev)];
if (DEV_IS_GONE(pm8001_dev) || !port->port_attached) {
if (sas_protocol_ata(task_proto)) {
struct task_status_struct *ts = &t->task_status;
ts->resp = SAS_TASK_UNDELIVERED;
ts->stat = SAS_PHY_DOWN;
spin_unlock_irqrestore(&pm8001_ha->lock, flags);
t->task_done(t);
spin_lock_irqsave(&pm8001_ha->lock, flags);
continue;
} else {
struct task_status_struct *ts = &t->task_status;
ts->resp = SAS_TASK_UNDELIVERED;
ts->stat = SAS_PHY_DOWN;
t->task_done(t);
continue;
}
}
pm8001_dev = dev->lldd_dev;
port = &pm8001_ha->port[sas_find_local_port_id(dev)];
ccb = pm8001_ccb_alloc(pm8001_ha, pm8001_dev, t);
if (!ccb) {
rc = -SAS_QUEUE_FULL;
goto err_out;
}
if (!sas_protocol_ata(task_proto)) {
if (t->num_scatter) {
n_elem = dma_map_sg(pm8001_ha->dev,
t->scatter,
t->num_scatter,
t->data_dir);
if (!n_elem) {
rc = -ENOMEM;
goto err_out_ccb;
}
}
if (DEV_IS_GONE(pm8001_dev) || !port->port_attached) {
ts->resp = SAS_TASK_UNDELIVERED;
ts->stat = SAS_PHY_DOWN;
if (sas_protocol_ata(task_proto)) {
spin_unlock_irqrestore(&pm8001_ha->lock, flags);
task->task_done(task);
spin_lock_irqsave(&pm8001_ha->lock, flags);
} else {
n_elem = t->num_scatter;
task->task_done(task);
}
rc = -ENODEV;
goto err_out;
}
t->lldd_task = ccb;
ccb->n_elem = n_elem;
ccb = pm8001_ccb_alloc(pm8001_ha, pm8001_dev, task);
if (!ccb) {
rc = -SAS_QUEUE_FULL;
goto err_out;
}
switch (task_proto) {
case SAS_PROTOCOL_SMP:
atomic_inc(&pm8001_dev->running_req);
rc = pm8001_task_prep_smp(pm8001_ha, ccb);
break;
case SAS_PROTOCOL_SSP:
atomic_inc(&pm8001_dev->running_req);
if (is_tmf)
rc = pm8001_task_prep_ssp_tm(pm8001_ha,
ccb, tmf);
else
rc = pm8001_task_prep_ssp(pm8001_ha, ccb);
break;
case SAS_PROTOCOL_SATA:
case SAS_PROTOCOL_STP:
atomic_inc(&pm8001_dev->running_req);
rc = pm8001_task_prep_ata(pm8001_ha, ccb);
break;
default:
dev_printk(KERN_ERR, pm8001_ha->dev,
"unknown sas_task proto: 0x%x\n", task_proto);
rc = -EINVAL;
break;
if (!sas_protocol_ata(task_proto)) {
if (task->num_scatter) {
n_elem = dma_map_sg(pm8001_ha->dev, task->scatter,
task->num_scatter, task->data_dir);
if (!n_elem) {
rc = -ENOMEM;
goto err_out_ccb;
}
}
} else {
n_elem = task->num_scatter;
}
if (rc) {
pm8001_dbg(pm8001_ha, IO, "rc is %x\n", rc);
atomic_dec(&pm8001_dev->running_req);
goto err_out_ccb;
}
/* TODO: select normal or high priority */
} while (0);
rc = 0;
goto out_done;
task->lldd_task = ccb;
ccb->n_elem = n_elem;
atomic_inc(&pm8001_dev->running_req);
switch (task_proto) {
case SAS_PROTOCOL_SMP:
rc = pm8001_task_prep_smp(pm8001_ha, ccb);
break;
case SAS_PROTOCOL_SSP:
if (is_tmf)
rc = pm8001_task_prep_ssp_tm(pm8001_ha, ccb, tmf);
else
rc = pm8001_task_prep_ssp(pm8001_ha, ccb);
break;
case SAS_PROTOCOL_SATA:
case SAS_PROTOCOL_STP:
rc = pm8001_task_prep_ata(pm8001_ha, ccb);
break;
default:
dev_printk(KERN_ERR, pm8001_ha->dev,
"unknown sas_task proto: 0x%x\n", task_proto);
rc = -EINVAL;
break;
}
if (rc) {
atomic_dec(&pm8001_dev->running_req);
if (!sas_protocol_ata(task_proto) && n_elem)
dma_unmap_sg(pm8001_ha->dev, task->scatter,
task->num_scatter, task->data_dir);
err_out_ccb:
pm8001_ccb_free(pm8001_ha, ccb);
pm8001_ccb_free(pm8001_ha, ccb);
err_out:
dev_printk(KERN_ERR, pm8001_ha->dev, "pm8001 exec failed[%d]!\n", rc);
if (!sas_protocol_ata(task_proto))
if (n_elem)
dma_unmap_sg(pm8001_ha->dev, t->scatter, t->num_scatter,
t->data_dir);
out_done:
pm8001_dbg(pm8001_ha, IO, "pm8001_task_exec failed[%d]!\n", rc);
}
spin_unlock_irqrestore(&pm8001_ha->lock, flags);
return rc;
}