ide: allow ide_dev_read_id() to be called from the IRQ context

* Un-static __ide_wait_stat().

* Allow ide_dev_read_id() helper to be called from the IRQ context by
  adding irq_ctx flag and using mdelay()/__ide_wait_stat() when needed.

* Switch ide_driveid_update() to set irq_ctx flag.

This change is needed for the consecutive patch which fixes races in
handling of user-space SET XFER commands but for improved bisectability
and clarity it is better to do it in a separate patch.
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/ide/ide-iops.c

@@ -102,7 +102,7 @@ EXPORT_SYMBOL(ide_fixstring);
  * setting a timer to wake up at half second intervals thereafter,
  * until timeout is achieved, before timing out.
  */
-static int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
+int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
 		    unsigned long timeout, u8 *rstat)
 {
 	ide_hwif_t *hwif = drive->hwif;
@@ -316,7 +316,7 @@ int ide_driveid_update(ide_drive_t *drive)
 		return 0;
 
 	SELECT_MASK(drive, 1);
-	rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id);
+	rc = ide_dev_read_id(drive, ATA_CMD_ID_ATA, id, 1);
 	SELECT_MASK(drive, 0);
 
 	if (rc)

drivers/ide/ide-probe.c

@@ -238,6 +238,7 @@ static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
  *	@drive: drive to identify
  *	@cmd: command to use
  *	@id: buffer for IDENTIFY data
+ *	@irq_ctx: flag set when called from the IRQ context
  *
  *	Sends an ATA(PI) IDENTIFY request to a drive and waits for a response.
  *
@@ -246,7 +247,7 @@ static void do_identify(ide_drive_t *drive, u8 cmd, u16 *id)
  *			2  device aborted the command (refused to identify itself)
  */
 
-int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id)
+int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id, int irq_ctx)
 {
 	ide_hwif_t *hwif = drive->hwif;
 	struct ide_io_ports *io_ports = &hwif->io_ports;
@@ -263,6 +264,9 @@ int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id)
 		tp_ops->write_devctl(hwif, ATA_NIEN | ATA_DEVCTL_OBS);
 
 	/* take a deep breath */
+	if (irq_ctx)
+		mdelay(50);
+	else
 		msleep(50);
 
 	if (io_ports->ctl_addr &&
@@ -295,12 +299,19 @@ int ide_dev_read_id(ide_drive_t *drive, u8 cmd, u16 *id)
 
 	timeout = ((cmd == ATA_CMD_ID_ATA) ? WAIT_WORSTCASE : WAIT_PIDENTIFY) / 2;
 
-	if (ide_busy_sleep(drive, timeout, use_altstatus))
+	/* wait for IRQ and ATA_DRQ */
+	if (irq_ctx) {
+		rc = __ide_wait_stat(drive, ATA_DRQ, BAD_R_STAT, timeout, &s);
+		if (rc)
+			return 1;
+	} else {
+		rc = ide_busy_sleep(drive, timeout, use_altstatus);
+		if (rc)
 			return 1;
 
-	/* wait for IRQ and ATA_DRQ */
 		msleep(50);
 		s = tp_ops->read_status(hwif);
+	}
 
 	if (OK_STAT(s, ATA_DRQ, BAD_R_STAT)) {
 		/* drive returned ID */
@@ -406,10 +417,10 @@ static int do_probe (ide_drive_t *drive, u8 cmd)
 
 	if (OK_STAT(stat, ATA_DRDY, ATA_BUSY) ||
 	    present || cmd == ATA_CMD_ID_ATAPI) {
-		rc = ide_dev_read_id(drive, cmd, id);
+		rc = ide_dev_read_id(drive, cmd, id, 0);
 		if (rc)
 			/* failed: try again */
-			rc = ide_dev_read_id(drive, cmd, id);
+			rc = ide_dev_read_id(drive, cmd, id, 0);
 
 		stat = tp_ops->read_status(hwif);
 
@@ -424,7 +435,7 @@ static int do_probe (ide_drive_t *drive, u8 cmd)
 			msleep(50);
 			tp_ops->exec_command(hwif, ATA_CMD_DEV_RESET);
 			(void)ide_busy_sleep(drive, WAIT_WORSTCASE, 0);
-			rc = ide_dev_read_id(drive, cmd, id);
+			rc = ide_dev_read_id(drive, cmd, id, 0);
 		}
 
 		/* ensure drive IRQ is clear */

include/linux/ide.h

@@ -1081,6 +1081,7 @@ extern void ide_fixstring(u8 *, const int, const int);
 
 int ide_busy_sleep(ide_drive_t *, unsigned long, int);
 
+int __ide_wait_stat(ide_drive_t *, u8, u8, unsigned long, u8 *);
 int ide_wait_stat(ide_startstop_t *, ide_drive_t *, u8, u8, unsigned long);
 
 ide_startstop_t ide_do_park_unpark(ide_drive_t *, struct request *);
@@ -1169,7 +1170,7 @@ int ide_no_data_taskfile(ide_drive_t *, struct ide_cmd *);
 
 int ide_taskfile_ioctl(ide_drive_t *, unsigned long);
 
-int ide_dev_read_id(ide_drive_t *, u8, u16 *);
+int ide_dev_read_id(ide_drive_t *, u8, u16 *, int);
 
 extern int ide_driveid_update(ide_drive_t *);
 extern int ide_config_drive_speed(ide_drive_t *, u8);