From: Dan Carpenter <error27@gmail.com>
To: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: kernel-janitors@vger.kernel.org, xen-devel@lists.xensource.com,
virtualization@lists.linux-foundation.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: [patch 1/2] xen-gntdev: return -EFAULT on copy_to_user failure
Date: Sat, 19 Mar 2011 08:44:34 +0300 [thread overview]
Message-ID: <20110319054434.GD2008@bicker> (raw)
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]);
next reply other threads:[~2011-03-19 5:44 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-19 5:44 Dan Carpenter [this message]
2011-03-25 15:04 ` [Xen-devel] [patch 1/2] xen-gntdev: return -EFAULT on copy_to_user failure Konrad Rzeszutek Wilk
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