[PATCH 2/4] xen/hvc: Fix error cases around HVM_PARAM_CONSOLE_PFN

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

We weren't resetting the parameter to be passed in to a
known default. Nor were we checking the return value of
hvm_get_parameter.

CC: stable@kernel.org
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
 drivers/tty/hvc/hvc_xen.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/tty/hvc/hvc_xen.c b/drivers/tty/hvc/hvc_xen.c
index afc7fc2..3277f0e 100644
--- a/drivers/tty/hvc/hvc_xen.c
+++ b/drivers/tty/hvc/hvc_xen.c
@@ -219,7 +219,8 @@ static int xen_hvm_console_init(void)
 	if (r < 0)
 		goto err;
 	info->evtchn = v;
-	hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
+	v = 0;
+	r = hvm_get_parameter(HVM_PARAM_CONSOLE_PFN, &v);
 	if (r < 0)
 		goto err;
 	mfn = v;
-- 
1.7.7.5