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* [patch 1/2] xen-gntdev: return -EFAULT on copy_to_user failure
@ 2011-03-19  5:44 ` Dan Carpenter
  0 siblings, 0 replies; 5+ messages in thread
From: Dan Carpenter @ 2011-03-19  5:44 UTC (permalink / raw)
  To: Jeremy Fitzhardinge
  Cc: kernel-janitors, xen-devel, virtualization, Konrad Rzeszutek Wilk

copy_to_user() returns the amount of data remaining to be copied.  We
want to return a negative error code here.  The upper layers just
call WARN_ON() if we return non-zero so this doesn't change the
behavior.  But returning -EFAULT is still cleaner.

Signed-off-by: Dan Carpenter <error27@gmail.com>

diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index 017ce60..b0f9e8f 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -273,7 +273,7 @@ static int __unmap_grant_pages(struct grant_map *map, int offset, int pages)
 				map->vma->vm_start + map->notify.addr;
 			err = copy_to_user(tmp, &err, 1);
 			if (err)
-				return err;
+				return -EFAULT;
 			map->notify.flags &= ~UNMAP_NOTIFY_CLEAR_BYTE;
 		} else if (pgno >= offset && pgno < offset + pages) {
 			uint8_t *tmp = kmap(map->pages[pgno]);

^ permalink raw reply related	[flat|nested] 5+ messages in thread

end of thread, other threads:[~2011-03-25 15:04 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2011-03-19  5:44 [patch 1/2] xen-gntdev: return -EFAULT on copy_to_user failure Dan Carpenter
2011-03-19  5:44 ` Dan Carpenter
2011-03-25 15:04 ` [Xen-devel] " Konrad Rzeszutek Wilk
2011-03-25 15:04 ` [Xen-devel] [patch 1/2] xen-gntdev: return -EFAULT on Konrad Rzeszutek Wilk
2011-03-25 15:04   ` [patch 1/2] xen-gntdev: return -EFAULT on copy_to_user failure Konrad Rzeszutek Wilk

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