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>

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 2892b242bbe1..b99873845d21 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -102,8 +102,8 @@ 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,
-                           unsigned long timeout, u8 *rstat)
+int __ide_wait_stat(ide_drive_t *drive, u8 good, u8 bad,
+                    unsigned long timeout, u8 *rstat)
 {
         ide_hwif_t *hwif = drive->hwif;
         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
@@ -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)