[PATCH 2/9] scsi/sr: add error handling support for add_disk()

[Luis Chamberlain <mcgrof@xxxxxxxxxx>]

We never checked for errors on add_disk() as this function
returned void. Now that this is fixed, use the shiny new
error handling.

Just put the cdrom kref and have the unwinding be done by
sr_kref_release().

Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
---
 drivers/scsi/sr.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c
index 115f7ef7a5de..4e5515848fa6 100644
--- a/drivers/scsi/sr.c
+++ b/drivers/scsi/sr.c
@@ -728,7 +728,12 @@ static int sr_probe(struct device *dev)
        dev_set_drvdata(dev, cd);
        disk->flags |= GENHD_FL_REMOVABLE;
        sr_revalidate_disk(cd);
-       device_add_disk(&sdev->sdev_gendev, disk, NULL);
+
+       error = device_add_disk(&sdev->sdev_gendev, disk, NULL);
+       if (error) {
+               kref_put(&cd->kref, sr_kref_release);
+               goto fail;
+       }
 
        sdev_printk(KERN_DEBUG, sdev,
                    "Attached scsi CD-ROM %s\n", cd->cdi.name);
-- 
2.30.2