rtc: Fix ioctl error path return

Bryan Henderson noticed that the  "RTC: Fix rtc driver ioctl specific
shortcutting" commit has a small bug: When an ioctl is called with an
invalid command code and the clock driver does not have an "ioctl"
method, the ioctl returns rc 0 instead of -ENOTTY.

This patch fixes the issue.

CC: Bryan Henderson <bryanh@giraffe-data.com>
CC: Gabor Z. Papp <gzp@papp.hu>
Reported-by: Bryan Henderson <bryanh@giraffe-data.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/rtc/rtc-dev.c b/drivers/rtc/rtc-dev.c
index d0e06edb14c5..cace6d3aed9a 100644
--- a/drivers/rtc/rtc-dev.c
+++ b/drivers/rtc/rtc-dev.c
@@ -421,7 +421,8 @@ static long rtc_dev_ioctl(struct file *file,
                         err = ops->ioctl(rtc->dev.parent, cmd, arg);
                         if (err == -ENOIOCTLCMD)
                                 err = -ENOTTY;
-                }
+                } else
+                        err = -ENOTTY;
                 break;
         }