2012-02-10 19:56:13 +00:00
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--- a/drivers/scsi/sd.c
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+++ a/drivers/scsi/sd.c
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@@ -2362,13 +2362,18 @@ static int sd_try_extended_inquiry(struct scsi_device *sdp)
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static int sd_revalidate_disk(struct gendisk *disk)
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{
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struct scsi_disk *sdkp = scsi_disk(disk);
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- struct scsi_device *sdp = sdkp->device;
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+ struct scsi_device *sdp;
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unsigned char *buffer;
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unsigned flush = 0;
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SCSI_LOG_HLQUEUE(3, sd_printk(KERN_INFO, sdkp,
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"sd_revalidate_disk\n"));
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2012-02-14 16:01:47 +00:00
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+ if (WARN_ONCE((!sdkp), "Invalid scsi_disk from %p\n", disk))
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2012-02-10 19:56:13 +00:00
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+ goto out;
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+
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+ sdp = sdkp->device;
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+
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/*
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* If the device is offline, don't try and read capacity or any
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* of the other niceties.
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