The ioctl can be called prior to full device setup having completed.
Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
drivers/block/xen-blkfront.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- 4.7-rc6-xen.orig/drivers/block/xen-blkfront.c
+++ 4.7-rc6-xen/drivers/block/xen-blkfront.c
@@ -496,12 +496,10 @@ static int blkif_ioctl(struct block_devi
return -EFAULT;
return 0;
- case CDROM_GET_CAPABILITY: {
- struct gendisk *gd = info->gd;
- if (gd->flags & GENHD_FL_CD)
+ case CDROM_GET_CAPABILITY:
+ if (info->gd && (info->gd->flags & GENHD_FL_CD))
return 0;
return -EINVAL;
- }
default:
/*printk(KERN_ALERT "ioctl %08x not supported by Xen blkdev\n",
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