Uwe, others, does this patch fix your problem?
It will have a few printk's that it spews out, but if it fixes your
problem, at least we know a bit more.
Linus
---
diff --git a/block/scsi_ioctl.c b/block/scsi_ioctl.c
index 2528a0c..f0ff151 100644
--- a/block/scsi_ioctl.c
+++ b/block/scsi_ioctl.c
@@ -333,8 +333,13 @@ static int sg_io(struct file *file, request_queue_t *q,
hdr->sb_len_wr = len;
}
- if (blk_rq_unmap_user(bio))
+ if (rq->bio != bio)
+ printk("rq->bio = %p, bio = %p\n", rq->bio, bio);
+
+ if (blk_rq_unmap_user(rq->bio)) {
+ printk("blk_rq_unmap_user failed!\n");
ret = -EFAULT;
+ }
/* may not have succeeded, but output values written to control
* structure (struct sg_io_hdr). */
-
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