usb: chipidea: core: check before accessing ci_role in ci_role_show

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@hale.at>
Signed-off-by: Peter Chen <peter.chen@nxp.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index 9e217b1361ea..fe4fe2440729 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,