[PATCH] usb: chipidea: core: check before accessing ci_role in ci_role_show

[Michael Thalmeier]

ci_role BUGs when the role is >= CI_ROLE_END.
This is the case while the role is changing.

Signed-off-by: Michael Thalmeier <michael.thalmeier@xxxxxxx>
---
 drivers/usb/chipidea/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 9e217b1..fe4fe24 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -843,7 +843,10 @@ static ssize_t ci_role_show(struct device *dev, struct device_attribute *attr,
 {
 	struct ci_hdrc *ci = dev_get_drvdata(dev);
 
-	return sprintf(buf, "%s\n", ci_role(ci)->name);
+	if (ci->role != CI_ROLE_END)
+		return sprintf(buf, "%s\n", ci_role(ci)->name);
+
+	return 0;
 }
 
 static ssize_t ci_role_store(struct device *dev,
-- 
2.9.2