watchdog: xen: don't clear is_active when xen_wdt_stop() failed

xen_wdt_release() shouldn't clear is_active even when the watchdog
didn't get stopped (which by itself shouldn't happen, but let's return
a proper error in this case rather than adding a BUG() upon hypercall
failure).

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Wim Van Sebroeck <wim@iguana.be>

1 files changed, 5 insertions, 3 deletions

diff --git a/drivers/watchdog/xen_wdt.c b/drivers/watchdog/xen_wdt.c
index e04fd6cf2121..e4a25b51165c 100644
--- a/drivers/watchdog/xen_wdt.c
+++ b/drivers/watchdog/xen_wdt.c
@@ -132,15 +132,17 @@ static int xen_wdt_open(struct inode *inode, struct file *file)
 
 static int xen_wdt_release(struct inode *inode, struct file *file)
 {
+        int err = 0;
+
         if (expect_release)
-                xen_wdt_stop();
+                err = xen_wdt_stop();
         else {
                 pr_crit("unexpected close, not stopping watchdog!\n");
                 xen_wdt_kick();
         }
-        is_active = false;
+        is_active = err;
         expect_release = false;
-        return 0;
+        return err;
 }
 
 static ssize_t xen_wdt_write(struct file *file, const char __user *data,