IDE: Report errors during drive reset back to user space

Make sure that each error condition during the execution of an
HDIO_DRIVE_RESET ioctl is actually reported to the calling process.
Also, unify the exit path of reset_pollfunc() when returning ide_stopped
since the need of ->port_ops->reset_poll() to be treated specially has
vanished (way back, it seems).

Signed-off-by: Elias Oltmanns <eo@nebensachen.de>
Cc: "Alan Cox" <alan@lxorguk.ukuu.org.uk>
Cc: "Randy Dunlap" <randy.dunlap@oracle.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

4 files changed, 20 insertions, 13 deletions

diff --git a/Documentation/ioctl/hdio.txt b/Documentation/ioctl/hdio.txt
index 44d283d6b136..91a6ecbae0bb 100644
--- a/Documentation/ioctl/hdio.txt
+++ b/Documentation/ioctl/hdio.txt
@@ -508,6 +508,8 @@ HDIO_DRIVE_RESET		execute a device reset
 
         error returns:
           EACCES        Access denied:  requires CAP_SYS_ADMIN
+          ENXIO         No such device: phy dead or ctl_addr == 0
+          EIO           I/O error:      reset timed out or hardware error
 
         notes:
 
diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c
index 96f63eb12092..44aaec256a30 100644
--- a/drivers/ide/ide-iops.c
+++ b/drivers/ide/ide-iops.c
@@ -905,12 +905,12 @@ void ide_execute_pkt_cmd(ide_drive_t *drive)
 }
 EXPORT_SYMBOL_GPL(ide_execute_pkt_cmd);
 
-static inline void ide_complete_drive_reset(ide_drive_t *drive)
+static inline void ide_complete_drive_reset(ide_drive_t *drive, int err)
 {
         struct request *rq = drive->hwif->hwgroup->rq;
 
         if (rq && blk_special_request(rq) && rq->cmd[0] == REQ_DRIVE_RESET)
-                ide_end_request(drive, 1, 0);
+                ide_end_request(drive, err ? err : 1, 0);
 }
 
 /* needed below */
@@ -948,7 +948,7 @@ static ide_startstop_t atapi_reset_pollfunc (ide_drive_t *drive)
         }
         /* done polling */
         hwgroup->polling = 0;
-        ide_complete_drive_reset(drive);
+        ide_complete_drive_reset(drive, 0);
         return ide_stopped;
 }
 
@@ -964,9 +964,11 @@ static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
         ide_hwif_t *hwif        = HWIF(drive);
         const struct ide_port_ops *port_ops = hwif->port_ops;
         u8 tmp;
+        int err = 0;
 
         if (port_ops && port_ops->reset_poll) {
-                if (port_ops->reset_poll(drive)) {
+                err = port_ops->reset_poll(drive);
+                if (err) {
                         printk(KERN_ERR "%s: host reset_poll failure for %s.\n",
                                 hwif->name, drive->name);
                         goto out;
@@ -983,6 +985,7 @@ static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
                 }
                 printk("%s: reset timed-out, status=0x%02x\n", hwif->name, tmp);
                 drive->failures++;
+                err = -EIO;
         } else  {
                 printk("%s: reset: ", hwif->name);
                 tmp = ide_read_error(drive);
@@ -1009,11 +1012,12 @@ static ide_startstop_t reset_pollfunc (ide_drive_t *drive)
                         if (tmp & 0x80)
                                 printk("; slave: failed");
                         printk("\n");
+                        err = -EIO;
                 }
         }
-        hwgroup->polling = 0;   /* done polling */
 out:
-        ide_complete_drive_reset(drive);
+        hwgroup->polling = 0;   /* done polling */
+        ide_complete_drive_reset(drive, err);
         return ide_stopped;
 }
 
@@ -1120,7 +1124,7 @@ static ide_startstop_t do_reset1 (ide_drive_t *drive, int do_not_try_atapi)
 
         if (io_ports->ctl_addr == 0) {
                 spin_unlock_irqrestore(&ide_lock, flags);
-                ide_complete_drive_reset(drive);
+                ide_complete_drive_reset(drive, -ENXIO);
                 return ide_stopped;
         }
 
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 1ec983b00511..d4a6b102a772 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -529,17 +529,20 @@ static int generic_ide_resume(struct device *dev)
         return err;
 }
 
-static void generic_drive_reset(ide_drive_t *drive)
+static int generic_drive_reset(ide_drive_t *drive)
 {
         struct request *rq;
+        int ret = 0;
 
         rq = blk_get_request(drive->queue, READ, __GFP_WAIT);
         rq->cmd_type = REQ_TYPE_SPECIAL;
         rq->cmd_len = 1;
         rq->cmd[0] = REQ_DRIVE_RESET;
         rq->cmd_flags |= REQ_SOFTBARRIER;
-        blk_execute_rq(drive->queue, NULL, rq, 1);
+        if (blk_execute_rq(drive->queue, NULL, rq, 1))
+                ret = rq->errors;
         blk_put_request(rq);
+        return ret;
 }
 
 int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device *bdev,
@@ -616,8 +619,7 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device
                         if (!capable(CAP_SYS_ADMIN))
                                 return -EACCES;
 
-                        generic_drive_reset(drive);
-                        return 0;
+                        return generic_drive_reset(drive);
 
                 case HDIO_GET_BUSSTATE:
                         if (!capable(CAP_SYS_ADMIN))
diff --git a/drivers/ide/pci/siimage.c b/drivers/ide/pci/siimage.c
index b75e9bb390a7..6e9d7655d89c 100644
--- a/drivers/ide/pci/siimage.c
+++ b/drivers/ide/pci/siimage.c
@@ -421,8 +421,7 @@ static int sil_sata_reset_poll(ide_drive_t *drive)
                 if ((sata_stat & 0x03) != 0x03) {
                         printk(KERN_WARNING "%s: reset phy dead, status=0x%08x\n",
                                             hwif->name, sata_stat);
-                        HWGROUP(drive)->polling = 0;
-                        return ide_started;
+                        return -ENXIO;
                 }
         }