[libata] ata_tf_to_host cleanups

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.

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 8be7dc0..a17e120 100644 (file)
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -295,28 +295,6 @@ void ata_exec_command(struct ata_port *ap, const struct ata_taskfile *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
  *     @tf: ATA taskfile register set
@@ -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;
 

diff --git a/drivers/scsi/libata.h b/drivers/scsi/libata.h
index 10ecd9e..fad051c 100644 (file)
--- a/drivers/scsi/libata.h
+++ b/drivers/scsi/libata.h
@@ -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);