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--- a/drivers/scsi/sd.c
+++ a/drivers/scsi/sd.c
@@ -2362,13 +2362,18 @@ static int sd_try_extended_inquiry(struct scsi_device *sdp)
static int sd_revalidate_disk(struct gendisk *disk)
{
struct scsi_disk *sdkp = scsi_disk(disk);
- struct scsi_device *sdp = sdkp->device;
+ struct scsi_device *sdp;
unsigned char *buffer;
unsigned flush = 0;
SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
"sd_revalidate_disk\n"));
+ if (WARN_ONCE((!sdkp), "Invalid scsi_disk from %p\n", disk))
+ goto out;
+
+ sdp = sdkp->device;
+
/*
* If the device is offline, don't try and read capacity or any
* of the other niceties.
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