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Input: omap4-keypad - fix runtime PM error handling

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[ Upstream commit 59bbf83835f591b95c3bdd09d900f3584fa227af ]

In omap4_keypad_probe, the patch fix several bugs.

  1) pm_runtime_get_sync will increment pm usage counter even it
     failed. Forgetting to pm_runtime_put_noidle will result in
     reference leak.

  2) In err_unmap, forget to disable runtime of device,
     pm_runtime_enable will increase power disable depth. Thus a
     pairing decrement is needed on the error handling path to keep
     it balanced.

  3) In err_pm_disable, it will call pm_runtime_put_sync twice not
     one time.

To fix this we factor out code reading revision and disabling touchpad, and
drop PM reference once we are done talking to the device.

Fixes: f77621cc64 ("Input: omap-keypad - dynamically handle register offsets")
Fixes: 5ad567ffba ("Input: omap4-keypad - wire up runtime PM handling")
Signed-off-by: Zhang Qilong <zhangqilong3@huawei.com>
Link: https://lore.kernel.org/r/20201120133918.2559681-1-zhangqilong3@huawei.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Zhang Qilong 2020-11-20 16:36:49 -08:00 committed by Greg Kroah-Hartman
parent 94268e0c9a
commit 0e8d632e41
1 changed files with 53 additions and 36 deletions
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89
drivers/input/keyboard/omap4-keypad.c
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@ -186,12 +186,8 @@ static int omap4_keypad_open(struct input_dev *input)
return 0;
}
static void omap4_keypad_close(struct input_dev *input)
static void omap4_keypad_stop(struct omap4_keypad *keypad_data)
{
struct omap4_keypad *keypad_data = input_get_drvdata(input);
disable_irq(keypad_data->irq);
/* Disable interrupts and wake-up events */
kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQENABLE,
OMAP4_VAL_IRQDISABLE);
@ -200,7 +196,15 @@ static void omap4_keypad_close(struct input_dev *input)
/* clear pending interrupts */
kbd_write_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS,
kbd_read_irqreg(keypad_data, OMAP4_KBD_IRQSTATUS));
}
static void omap4_keypad_close(struct input_dev *input)
{
struct omap4_keypad *keypad_data;
keypad_data = input_get_drvdata(input);
disable_irq(keypad_data->irq);
omap4_keypad_stop(keypad_data);
enable_irq(keypad_data->irq);
pm_runtime_put_sync(input->dev.parent);
@ -223,13 +227,37 @@ static int omap4_keypad_parse_dt(struct device *dev,
return 0;
}
static int omap4_keypad_check_revision(struct device *dev,
struct omap4_keypad *keypad_data)
{
unsigned int rev;
rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
rev &= 0x03 << 30;
rev >>= 30;
switch (rev) {
case KBD_REVISION_OMAP4:
keypad_data->reg_offset = 0x00;
keypad_data->irqreg_offset = 0x00;
break;
case KBD_REVISION_OMAP5:
keypad_data->reg_offset = 0x10;
keypad_data->irqreg_offset = 0x0c;
break;
default:
dev_err(dev, "Keypad reports unsupported revision %d", rev);
return -EINVAL;
}
return 0;
}
static int omap4_keypad_probe(struct platform_device *pdev)
{
struct omap4_keypad *keypad_data;
struct input_dev *input_dev;
struct resource *res;
unsigned int max_keys;
int rev;
int irq;
int error;
@ -269,41 +297,33 @@ static int omap4_keypad_probe(struct platform_device *pdev)
goto err_release_mem;
}
pm_runtime_enable(&pdev->dev);
/*
* Enable clocks for the keypad module so that we can read
* revision register.
*/
pm_runtime_enable(&pdev->dev);
error = pm_runtime_get_sync(&pdev->dev);
if (error) {
dev_err(&pdev->dev, "pm_runtime_get_sync() failed\n");
goto err_unmap;
}
rev = __raw_readl(keypad_data->base + OMAP4_KBD_REVISION);
rev &= 0x03 << 30;
rev >>= 30;
switch (rev) {
case KBD_REVISION_OMAP4:
keypad_data->reg_offset = 0x00;
keypad_data->irqreg_offset = 0x00;
break;
case KBD_REVISION_OMAP5:
keypad_data->reg_offset = 0x10;
keypad_data->irqreg_offset = 0x0c;
break;
default:
dev_err(&pdev->dev,
"Keypad reports unsupported revision %d", rev);
error = -EINVAL;
goto err_pm_put_sync;
pm_runtime_put_noidle(&pdev->dev);
} else {
error = omap4_keypad_check_revision(&pdev->dev,
keypad_data);
if (!error) {
/* Ensure device does not raise interrupts */
omap4_keypad_stop(keypad_data);
}
pm_runtime_put_sync(&pdev->dev);
}
if (error)
goto err_pm_disable;
/* input device allocation */
keypad_data->input = input_dev = input_allocate_device();
if (!input_dev) {
error = -ENOMEM;
goto err_pm_put_sync;
goto err_pm_disable;
}
input_dev->name = pdev->name;
@ -349,28 +369,25 @@ static int omap4_keypad_probe(struct platform_device *pdev)
goto err_free_keymap;
}
device_init_wakeup(&pdev->dev, true);
pm_runtime_put_sync(&pdev->dev);
error = input_register_device(keypad_data->input);
if (error < 0) {
dev_err(&pdev->dev, "failed to register input device\n");
goto err_pm_disable;
goto err_free_irq;
}
device_init_wakeup(&pdev->dev, true);
platform_set_drvdata(pdev, keypad_data);
return 0;
err_pm_disable:
pm_runtime_disable(&pdev->dev);
err_free_irq:
free_irq(keypad_data->irq, keypad_data);
err_free_keymap:
kfree(keypad_data->keymap);
err_free_input:
input_free_device(input_dev);
err_pm_put_sync:
pm_runtime_put_sync(&pdev->dev);
err_unmap:
err_pm_disable:
pm_runtime_disable(&pdev->dev);
iounmap(keypad_data->base);
err_release_mem:
release_mem_region(res->start, resource_size(res));