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authorSuman Anna <s-anna@ti.com>2015-03-17 04:14:02 +0300
committerTony Lindgren <tony@atomide.com>2015-03-17 20:44:58 +0300
commita76fc9dda87b51010e4bc60b5e0065a70180b465 (patch)
treeaa4fb16367ba9ebf251145f72a1558f871e46b56 /arch/arm/plat-omap
parente5ed5b60272871786b1c5434079925bc60d771b7 (diff)
downloadlinux-a76fc9dda87b51010e4bc60b5e0065a70180b465.tar.xz
ARM: OMAP: dmtimer: check for pm_runtime_get_sync() failure
The current OMAP dmtimer probe does not check for the return status of pm_runtime_get_sync() before initializing the timer registers. Any timer with missing hwmod data would return a failure here, and the access of registers without enabling the clocks for the timer would trigger a l3_noc interrupt and a kernel boot hang. Add proper checking so that the probe would return a failure graciously without hanging the kernel boot. Signed-off-by: Suman Anna <s-anna@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
Diffstat (limited to 'arch/arm/plat-omap')
-rw-r--r--arch/arm/plat-omap/dmtimer.c13
1 files changed, 12 insertions, 1 deletions
diff --git a/arch/arm/plat-omap/dmtimer.c b/arch/arm/plat-omap/dmtimer.c
index db10169a08de..f32c74c0e1de 100644
--- a/arch/arm/plat-omap/dmtimer.c
+++ b/arch/arm/plat-omap/dmtimer.c
@@ -799,6 +799,7 @@ static int omap_dm_timer_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
const struct of_device_id *match;
const struct dmtimer_platform_data *pdata;
+ int ret;
match = of_match_device(of_match_ptr(omap_timer_match), dev);
pdata = match ? match->data : dev->platform_data;
@@ -860,7 +861,12 @@ static int omap_dm_timer_probe(struct platform_device *pdev)
}
if (!timer->reserved) {
- pm_runtime_get_sync(dev);
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0) {
+ dev_err(dev, "%s: pm_runtime_get_sync failed!\n",
+ __func__);
+ goto err_get_sync;
+ }
__omap_dm_timer_init_regs(timer);
pm_runtime_put(dev);
}
@@ -873,6 +879,11 @@ static int omap_dm_timer_probe(struct platform_device *pdev)
dev_dbg(dev, "Device Probed.\n");
return 0;
+
+err_get_sync:
+ pm_runtime_put_noidle(dev);
+ pm_runtime_disable(dev);
+ return ret;
}
/**