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| author | Suman Anna <s-anna@ti.com> | 2015-03-16 20:14:02 -0500 |
|---|---|---|
| committer | Tony Lindgren <tony@atomide.com> | 2015-03-17 10:44:58 -0700 |
| commit | a76fc9dda87b51010e4bc60b5e0065a70180b465 (patch) | |
| tree | aa4fb16367ba9ebf251145f72a1558f871e46b56 | |
| parent | e5ed5b60272871786b1c5434079925bc60d771b7 (diff) | |
| download | linux-a76fc9dda87b51010e4bc60b5e0065a70180b465.tar.gz linux-a76fc9dda87b51010e4bc60b5e0065a70180b465.tar.bz2 linux-a76fc9dda87b51010e4bc60b5e0065a70180b465.zip | |
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>
| -rw-r--r-- | arch/arm/plat-omap/dmtimer.c | 13 |
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; } /** |