rtc: omap: fix potential crash on power off

commit 5c8b84f410b3819d14cb1ebf32e4b3714b5a6e0b upstream.

Do not set the system power-off callback and omap power-off rtc pointer
until we're done setting up our device to avoid leaving stale pointers
around after a late probe error.

Fixes: 97ea1906b3c2 ("rtc: omap: Support ext_wakeup configuration")
Cc: stable <stable@vger.kernel.org>     # 4.9
Cc: Marcin Niestroj <m.niestroj@grinn-global.com>
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/rtc/rtc-omap.c b/drivers/rtc/rtc-omap.c
index 51e5244..bd5ca54 100644 (file)
--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -817,13 +817,6 @@ static int omap_rtc_probe(struct platform_device *pdev)
                        goto err;
        }
 
-       if (rtc->is_pmic_controller) {
-               if (!pm_power_off) {
-                       omap_rtc_power_off_rtc = rtc;
-                       pm_power_off = omap_rtc_power_off;
-               }
-       }
-
        /* Support ext_wakeup pinconf */
        rtc_pinctrl_desc.name = dev_name(&pdev->dev);
 
@@ -833,6 +826,13 @@ static int omap_rtc_probe(struct platform_device *pdev)
                return PTR_ERR(rtc->pctldev);
        }
 
+       if (rtc->is_pmic_controller) {
+               if (!pm_power_off) {
+                       omap_rtc_power_off_rtc = rtc;
+                       pm_power_off = omap_rtc_power_off;
+               }
+       }
+
        return 0;
 
 err: