ide: add ide_execute_pkt_cmd() helper

Add ide_execute_pkt_cmd() helper for executing PACKET command,
then convert ATAPI device drivers to use it.

As a nice side-effect this fixes ide-{floppy,tape,scsi} w.r.t.
ide_lock taking (ide-cd was OK).
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

drivers/ide/ide-cd.c

@@ -555,14 +555,7 @@ static ide_startstop_t cdrom_start_packet_command(ide_drive_t *drive,
 				    ATAPI_WAIT_PC, cdrom_timer_expiry);
 		return ide_started;
 	} else {
-		unsigned long flags;
-
-		/* packet command */
-		spin_lock_irqsave(&ide_lock, flags);
-		hwif->OUTBSYNC(drive, WIN_PACKETCMD,
-			       hwif->io_ports.command_addr);
-		ndelay(400);
-		spin_unlock_irqrestore(&ide_lock, flags);
+		ide_execute_pkt_cmd(drive);
 
 		return (*handler) (drive);
 	}

drivers/ide/ide-floppy.c

@@ -696,9 +696,7 @@ static ide_startstop_t idefloppy_issue_pc(ide_drive_t *drive,
 		return ide_started;
 	} else {
 		/* Issue the packet command */
-		hwif->OUTBSYNC(drive, WIN_PACKETCMD,
-			       hwif->io_ports.command_addr);
-		ndelay(400);
+		ide_execute_pkt_cmd(drive);
 		return (*pkt_xfer_routine) (drive);
 	}
 }

drivers/ide/ide-iops.c

@@ -801,9 +801,19 @@ void ide_execute_command(ide_drive_t *drive, u8 cmd, ide_handler_t *handler,
 	ndelay(400);
 	spin_unlock_irqrestore(&ide_lock, flags);
 }
-
 EXPORT_SYMBOL(ide_execute_command);
 
+void ide_execute_pkt_cmd(ide_drive_t *drive)
+{
+	ide_hwif_t *hwif = drive->hwif;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ide_lock, flags);
+	hwif->OUTBSYNC(drive, WIN_PACKETCMD, hwif->io_ports.command_addr);
+	ndelay(400);
+	spin_unlock_irqrestore(&ide_lock, flags);
+}
+EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
 
 /* needed below */
 static ide_startstop_t do_reset1 (ide_drive_t *, int);

drivers/ide/ide-tape.c

@@ -1056,9 +1056,7 @@ static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
 				    IDETAPE_WAIT_CMD, NULL);
 		return ide_started;
 	} else {
-		hwif->OUTBSYNC(drive, WIN_PACKETCMD,
-			       hwif->io_ports.command_addr);
-		ndelay(400);
+		ide_execute_pkt_cmd(drive);
 		return idetape_transfer_pc(drive);
 	}
 }

drivers/scsi/ide-scsi.c

@@ -574,9 +574,7 @@ static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
 		return ide_started;
 	} else {
 		/* Issue the packet command */
-		hwif->OUTBSYNC(drive, WIN_PACKETCMD,
-			       hwif->io_ports.command_addr);
-		ndelay(400);
+		ide_execute_pkt_cmd(drive);
 		return idescsi_transfer_pc(drive);
 	}
 }

include/linux/ide.h

@@ -822,6 +822,8 @@ extern void ide_set_handler (ide_drive_t *drive, ide_handler_t *handler, unsigne
 void ide_execute_command(ide_drive_t *, u8, ide_handler_t *, unsigned int,
 			 ide_expiry_t *);
 
+void ide_execute_pkt_cmd(ide_drive_t *);
+
 ide_startstop_t __ide_error(ide_drive_t *, struct request *, u8, u8);
 
 ide_startstop_t ide_error (ide_drive_t *drive, const char *msg, byte stat);