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[libata] ata_tf_to_host cleanups

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Integrate ata_exec() and ata_tf_to_host() into their only caller,
ata_bus_edd().

Rename ata_tf_to_host_nolock() to ata_tf_to_host().

This makes locking a bit easier to review, and may help pave the way for
future changes.
This commit is contained in:
Jeff Garzik 2005-10-30 21:37:17 -05:00
parent 6e9d6b8ee4
commit e533825447
2 changed files with 10 additions and 48 deletions
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57
drivers/scsi/libata-core.c
View file

@ -294,28 +294,6 @@ void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *tf)
ata_exec_command_pio(ap, tf);
}
/**
* ata_exec - issue ATA command to host controller
* @ap: port to which command is being issued
* @tf: ATA taskfile register set
*
* Issues PIO/MMIO write to ATA command register, with proper
* synchronization with interrupt handler / other threads.
*
* LOCKING:
* Obtains host_set lock.
*/
static inline void ata_exec(struct ata_port *ap, const struct ata_taskfile *tf)
{
unsigned long flags;
DPRINTK("ata%u: cmd 0x%X\n", ap->id, tf->command);
spin_lock_irqsave(&ap->host_set->lock, flags);
ap->ops->exec_command(ap, tf);
spin_unlock_irqrestore(&ap->host_set->lock, flags);
}
/**
* ata_tf_to_host - issue ATA taskfile to host controller
* @ap: port to which command is being issued
@ -326,30 +304,11 @@ static inline void ata_exec(struct ata_port *ap, const struct ata_taskfile *tf)
* other threads.
*
* LOCKING:
* Obtains host_set lock.
*/
static void ata_tf_to_host(struct ata_port *ap, const struct ata_taskfile *tf)
{
ap->ops->tf_load(ap, tf);
ata_exec(ap, tf);
}
/**
* ata_tf_to_host_nolock - issue ATA taskfile to host controller
* @ap: port to which command is being issued
* @tf: ATA taskfile register set
*
* Issues ATA taskfile register set to ATA host controller,
* with proper synchronization with interrupt handler and
* other threads.
*
* LOCKING:
* spin_lock_irqsave(host_set lock)
*/
void ata_tf_to_host_nolock(struct ata_port *ap, const struct ata_taskfile *tf)
static inline void ata_tf_to_host(struct ata_port *ap,
const struct ata_taskfile *tf)
{
ap->ops->tf_load(ap, tf);
ap->ops->exec_command(ap, tf);
@ -1912,12 +1871,14 @@ static void ata_bus_post_reset(struct ata_port *ap, unsigned int devmask)
*
* LOCKING:
* PCI/etc. bus probe sem.
* Obtains host_set lock.
*
*/
static unsigned int ata_bus_edd(struct ata_port *ap)
{
struct ata_taskfile tf;
unsigned long flags;
/* set up execute-device-diag (bus reset) taskfile */
/* also, take interrupts to a known state (disabled) */
@ -1928,7 +1889,9 @@ static unsigned int ata_bus_edd(struct ata_port *ap)
tf.protocol = ATA_PROT_NODATA;
/* do bus reset */
spin_lock_irqsave(&ap->host_set->lock, flags);
ata_tf_to_host(ap, &tf);
spin_unlock_irqrestore(&ap->host_set->lock, flags);
/* spec says at least 2ms. but who knows with those
* crazy ATAPI devices...
@ -3555,7 +3518,7 @@ int ata_qc_issue_prot(struct ata_queued_cmd *qc)
switch (qc->tf.protocol) {
case ATA_PROT_NODATA:
ata_tf_to_host_nolock(ap, &qc->tf);
ata_tf_to_host(ap, &qc->tf);
break;
case ATA_PROT_DMA:
@ -3566,20 +3529,20 @@ int ata_qc_issue_prot(struct ata_queued_cmd *qc)
case ATA_PROT_PIO: /* load tf registers, initiate polling pio */
ata_qc_set_polling(qc);
ata_tf_to_host_nolock(ap, &qc->tf);
ata_tf_to_host(ap, &qc->tf);
ap->hsm_task_state = HSM_ST;
queue_work(ata_wq, &ap->pio_task);
break;
case ATA_PROT_ATAPI:
ata_qc_set_polling(qc);
ata_tf_to_host_nolock(ap, &qc->tf);
ata_tf_to_host(ap, &qc->tf);
queue_work(ata_wq, &ap->packet_task);
break;
case ATA_PROT_ATAPI_NODATA:
ap->flags |= ATA_FLAG_NOINTR;
ata_tf_to_host_nolock(ap, &qc->tf);
ata_tf_to_host(ap, &qc->tf);
queue_work(ata_wq, &ap->packet_task);
break;

1
drivers/scsi/libata.h
View file

@ -48,7 +48,6 @@ extern int ata_qc_issue(struct ata_queued_cmd *qc);
extern int ata_check_atapi_dma(struct ata_queued_cmd *qc);
extern void ata_dev_select(struct ata_port *ap, unsigned int device,
unsigned int wait, unsigned int can_sleep);
extern void ata_tf_to_host_nolock(struct ata_port *ap, const struct ata_taskfile *tf);
extern void swap_buf_le16(u16 *buf, unsigned int buf_words);
extern int ata_task_ioctl(struct scsi_device *scsidev, void __user *arg);
extern int ata_cmd_ioctl(struct scsi_device *scsidev, void __user *arg);