linux-kernel - [PATCH 4.18 074/145] rtc: omap: fix potential crash on power off

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Date:   Fri,  7 Sep 2018 23:09:00 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Marcin Niestroj <m.niestroj@...nn-global.com>,
        Tony Lindgren <tony@...mide.com>,
        Johan Hovold <johan@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>
Subject: [PATCH 4.18 074/145] rtc: omap: fix potential crash on power off

4.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.org>

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@...r.kernel.org>     # 4.9
Cc: Marcin Niestroj <m.niestroj@...nn-global.com>
Cc: Tony Lindgren <tony@...mide.com>
Signed-off-by: Johan Hovold <johan@...nel.org>
Acked-by: Tony Lindgren <tony@...mide.com>
Reviewed-by: Marcin Niestroj <m.niestroj@...nn-global.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@...tlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/rtc/rtc-omap.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/drivers/rtc/rtc-omap.c
+++ b/drivers/rtc/rtc-omap.c
@@ -861,13 +861,6 @@ static int omap_rtc_probe(struct platfor
 			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);
 
@@ -884,6 +877,13 @@ static int omap_rtc_probe(struct platfor
 
 	rtc_nvmem_register(rtc->rtc, &omap_rtc_nvmem_config);
 
+	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_deregister_pinctrl: