Hi Chanwoo,
On 13.03.2014 09:17, Chanwoo Choi wrote:
This patch fix bug about resource leak when happening probe fail and code clean
to add debug message.
Signed-off-by: Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
---
drivers/devfreq/exynos/exynos4_bus.c | 32 ++++++++++++++++++++++++++------
1 file changed, 26 insertions(+), 6 deletions(-)
diff --git a/drivers/devfreq/exynos/exynos4_bus.c b/drivers/devfreq/exynos/exynos4_bus.c
index a2a3a47..152a3e9 100644
--- a/drivers/devfreq/exynos/exynos4_bus.c
+++ b/drivers/devfreq/exynos/exynos4_bus.c
@@ -1152,8 +1152,11 @@ static int exynos4_busfreq_probe(struct platform_device *pdev)
dev_err(dev, "Cannot determine the device id %d\n", data->type);
err = -EINVAL;
}
- if (err)
+ if (err) {
+ dev_err(dev, "Cannot initialize busfreq table %d\n",
+ data->type);
return err;
+ }
rcu_read_lock();
opp = dev_pm_opp_find_freq_floor(dev,
@@ -1176,7 +1179,7 @@ static int exynos4_busfreq_probe(struct platform_device *pdev)
if (IS_ERR(data->devfreq)) {
dev_err(dev, "Failed to add devfreq device\n");
err = PTR_ERR(data->devfreq);
- goto err_opp;
+ goto err_devfreq;
}
/*
@@ -1185,18 +1188,35 @@ static int exynos4_busfreq_probe(struct platform_device *pdev)
*/
busfreq_mon_reset(data);
- devfreq_register_opp_notifier(dev, data->devfreq);
+ /* Register opp_notifier for Exynos4 busfreq */
+ err = devfreq_register_opp_notifier(dev, data->devfreq);
+ if (err < 0) {
+ dev_err(dev, "Failed to register opp notifier\n");
+ goto err_notifier_opp;
+ }
+ /* Register pm_notifier for Exynos4 busfreq */
err = register_pm_notifier(&data->pm_notifier);
if (err) {
dev_err(dev, "Failed to setup pm notifier\n");
- devfreq_remove_device(data->devfreq);
- return err;
+ goto err_notifier_pm;
}
return 0;
-err_opp:
+err_notifier_pm:
+ devfreq_unregister_opp_notifier(dev, data->devfreq);
+err_notifier_opp:
+ /*
+ * The devfreq_remove_device() would execute finally devfreq->profile
+ * ->exit(). To avoid duplicate resource free operation, return directly
+ * before executing resource free below 'err_devfreq' goto statement.
+ */
I'm not quite sure about this. I believe that in this case
devfreq->profile->exit() would be exynos4_bus_exit() and all it does is
devfreq_unregister_opp_notifier(dev, data->devfreq), so all remaining
resources (regulators, clocks, etc.) would get leaked.
I believe the correct thing to do would be to remove the .exit()
callback from exynos4_devfreq_profile struct and handle all the clean-up
here in error path.
Best regards,
Tomasz
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