gdrom,viocd: Convert to bdops->check_events()

Convert gdrom and viocd from ->media_changed() to ->check_events().

It's unclear how the conditions are cleared and it's possible that it
may generate spurious events when polled.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Kay Sievers <kay.sievers@vrfy.org>

2 files changed, 20 insertions, 13 deletions

diff --git a/drivers/cdrom/gdrom.c b/drivers/cdrom/gdrom.c
index 64a21461c408..b2b034fea34e 100644
--- a/drivers/cdrom/gdrom.c
+++ b/drivers/cdrom/gdrom.c
@@ -395,10 +395,12 @@ static int gdrom_drivestatus(struct cdrom_device_info *cd_info, int ignore)
         return CDS_NO_INFO;
 }
 
-static int gdrom_mediachanged(struct cdrom_device_info *cd_info, int ignore)
+static unsigned int gdrom_check_events(struct cdrom_device_info *cd_info,
+                                       unsigned int clearing, int ignore)
 {
         /* check the sense key */
-        return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60;
+        return (__raw_readb(GDROM_ERROR_REG) & 0xF0) == 0x60 ?
+                DISK_EVENT_MEDIA_CHANGE : 0;
 }
 
 /* reset the G1 bus */
@@ -483,7 +485,7 @@ static struct cdrom_device_ops gdrom_ops = {
         .open                   = gdrom_open,
         .release                = gdrom_release,
         .drive_status           = gdrom_drivestatus,
-        .media_changed          = gdrom_mediachanged,
+        .check_events           = gdrom_check_events,
         .get_last_session       = gdrom_get_last_session,
         .reset                  = gdrom_hardreset,
         .audio_ioctl            = gdrom_audio_ioctl,
@@ -509,9 +511,10 @@ static int gdrom_bdops_release(struct gendisk *disk, fmode_t mode)
         return 0;
 }
 
-static int gdrom_bdops_mediachanged(struct gendisk *disk)
+static unsigned int gdrom_bdops_check_events(struct gendisk *disk,
+                                             unsigned int clearing)
 {
-        return cdrom_media_changed(gd.cd_info);
+        return cdrom_check_events(gd.cd_info, clearing);
 }
 
 static int gdrom_bdops_ioctl(struct block_device *bdev, fmode_t mode,
@@ -530,7 +533,7 @@ static const struct block_device_operations gdrom_bdops = {
         .owner                  = THIS_MODULE,
         .open                   = gdrom_bdops_open,
         .release                = gdrom_bdops_release,
-        .media_changed          = gdrom_bdops_mediachanged,
+        .check_events           = gdrom_bdops_check_events,
         .ioctl                  = gdrom_bdops_ioctl,
 };
 
@@ -800,6 +803,7 @@ static int __devinit probe_gdrom(struct platform_device *devptr)
                 goto probe_fail_cdrom_register;
         }
         gd.disk->fops = &gdrom_bdops;
+        gd.disk->events = DISK_EVENT_MEDIA_CHANGE;
         /* latch on to the interrupt */
         err = gdrom_set_interrupt_handlers();
         if (err)
diff --git a/drivers/cdrom/viocd.c b/drivers/cdrom/viocd.c
index be73a9b493a6..4e874c5fa605 100644
--- a/drivers/cdrom/viocd.c
+++ b/drivers/cdrom/viocd.c
@@ -186,10 +186,11 @@ static int viocd_blk_ioctl(struct block_device *bdev, fmode_t mode,
         return ret;
 }
 
-static int viocd_blk_media_changed(struct gendisk *disk)
+static unsigned int viocd_blk_check_events(struct gendisk *disk,
+                                           unsigned int clearing)
 {
         struct disk_info *di = disk->private_data;
-        return cdrom_media_changed(&di->viocd_info);
+        return cdrom_check_events(&di->viocd_info, clearing);
 }
 
 static const struct block_device_operations viocd_fops = {
@@ -197,7 +198,7 @@ static const struct block_device_operations viocd_fops = {
         .open =                 viocd_blk_open,
         .release =              viocd_blk_release,
         .ioctl =                viocd_blk_ioctl,
-        .media_changed =        viocd_blk_media_changed,
+        .check_events =         viocd_blk_check_events,
 };
 
 static int viocd_open(struct cdrom_device_info *cdi, int purpose)
@@ -320,7 +321,8 @@ static void do_viocd_request(struct request_queue *q)
         }
 }
 
-static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
+static unsigned int viocd_check_events(struct cdrom_device_info *cdi,
+                                       unsigned int clearing, int disc_nr)
 {
         struct viocd_waitevent we;
         HvLpEvent_Rc hvrc;
@@ -340,7 +342,7 @@ static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
         if (hvrc != 0) {
                 pr_warning("bad rc on HvCallEvent_signalLpEventFast %d\n",
                            (int)hvrc);
-                return -EIO;
+                return 0;
         }
 
         wait_for_completion(&we.com);
@@ -354,7 +356,7 @@ static int viocd_media_changed(struct cdrom_device_info *cdi, int disc_nr)
                 return 0;
         }
 
-        return we.changed;
+        return we.changed ? DISK_EVENT_MEDIA_CHANGE : 0;
 }
 
 static int viocd_lock_door(struct cdrom_device_info *cdi, int locking)
@@ -550,7 +552,7 @@ static int viocd_audio_ioctl(struct cdrom_device_info *cdi, unsigned int cmd,
 static struct cdrom_device_ops viocd_dops = {
         .open = viocd_open,
         .release = viocd_release,
-        .media_changed = viocd_media_changed,
+        .check_events = viocd_check_events,
         .lock_door = viocd_lock_door,
         .generic_packet = viocd_packet,
         .audio_ioctl = viocd_audio_ioctl,
@@ -624,6 +626,7 @@ static int viocd_probe(struct vio_dev *vdev, const struct vio_device_id *id)
         gendisk->queue = q;
         gendisk->fops = &viocd_fops;
         gendisk->flags = GENHD_FL_CD|GENHD_FL_REMOVABLE;
+        gendisk->events = DISK_EVENT_MEDIA_CHANGE;
         set_capacity(gendisk, 0);
         gendisk->private_data = d;
         d->viocd_disk = gendisk;