xenfs/xenbus: report partial reads/writes correctly

copy_(to|from)_user return the number of uncopied bytes, so a successful
return is 0, and any non-zero result indicates some degree of failure.

Reported-by: "Jun Zhu (Intern)" <Jun.Zhu@citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

parent 6280f190

drivers/xen/xenfs/xenbus.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -142,7 +142,7 @@ static ssize_t xenbus_file_read(struct file *filp,
		i += sz - ret;
		rb->cons += sz - ret;

		if (ret != sz) {
		if (ret != 0) {
		if (i == 0)
		i = -EFAULT;
		goto out;
		@@ -453,7 +453,7 @@ static ssize_t xenbus_file_write(struct file *filp,

		ret = copy_from_user(u->u.buffer + u->len, ubuf, len);

		if (ret == len) {
		if (ret != 0) {
		rc = -EFAULT;
		goto out;
		}