1 files changed, 18 insertions, 3 deletions

diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index a955483d2404..944cd857c90a 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -293,8 +293,8 @@ int ide_driveid_update(ide_drive_t *drive)
         const struct ide_tp_ops *tp_ops = hwif->tp_ops;
         u16 *id;
         unsigned long flags;
-        int rc;
-        u8 uninitialized_var(s);
+        int use_altstatus = 0, rc;
+        u8 a, uninitialized_var(s);
 
         id = kmalloc(SECTOR_SIZE, GFP_ATOMIC);
         if (id == NULL)
@@ -308,9 +308,24 @@ int ide_driveid_update(ide_drive_t *drive)
         SELECT_MASK(drive, 1);
         tp_ops->set_irq(hwif, 0);
         msleep(50);
+
+        if (hwif->io_ports.ctl_addr &&
+            (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) {
+                a = tp_ops->read_altstatus(hwif);
+                s = tp_ops->read_status(hwif);
+                if ((a ^ s) & ~ATA_IDX)
+                        /* ancient Seagate drives, broken interfaces */
+                        printk(KERN_INFO "%s: probing with STATUS(0x%02x) "
+                                         "instead of ALTSTATUS(0x%02x)\n",
+                                         drive->name, s, a);
+                else
+                        /* use non-intrusive polling */
+                        use_altstatus = 1;
+        }
+
         tp_ops->exec_command(hwif, ATA_CMD_ID_ATA);
 
-        if (ide_busy_sleep(hwif, WAIT_WORSTCASE, 1)) {
+        if (ide_busy_sleep(hwif, WAIT_WORSTCASE, use_altstatus)) {
                 rc = 1;
                 goto out_err;
         }