Currently rbtn_add() in case of failure is leaking resources. Fix this
by adding a proper rollback. Move devm_kzalloc() before rbtn_acquire(),
so it doesn't require rollback in case of failure. While at it, remove
unnecessary assignment of NULL to device->driver_data and unnecessary
whitespace, plus add a break for the default case in a switch.
Suggested-by: Ilpo Järvinen <[email protected]>
Fixes: 817a5cdb40c8 ("dell-rbtn: Dell Airplane Mode Switch driver")
Signed-off-by: Michal Wilczynski <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Rafael J. Wysocki <[email protected]>
---
v2:
- move devm_kzalloc before rbtn_acquire as suggested
drivers/platform/x86/dell/dell-rbtn.c | 13 +++++++------
1 file changed, 7 insertions(+), 6 deletions(-)
diff --git a/drivers/platform/x86/dell/dell-rbtn.c b/drivers/platform/x86/dell/dell-rbtn.c
index aa0e6c907494..c8fcb537fd65 100644
--- a/drivers/platform/x86/dell/dell-rbtn.c
+++ b/drivers/platform/x86/dell/dell-rbtn.c
@@ -395,16 +395,16 @@ static int rbtn_add(struct acpi_device *device)
return -EINVAL;
}
+ rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL);
+ if (!rbtn_data)
+ return -ENOMEM;
+
ret = rbtn_acquire(device, true);
if (ret < 0) {
dev_err(&device->dev, "Cannot enable device\n");
return ret;
}
- rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL);
- if (!rbtn_data)
- return -ENOMEM;
-
rbtn_data->type = type;
device->driver_data = rbtn_data;
@@ -420,10 +420,12 @@ static int rbtn_add(struct acpi_device *device)
break;
default:
ret = -EINVAL;
+ break;
}
+ if (ret)
+ rbtn_acquire(device, false);
return ret;
-
}
static void rbtn_remove(struct acpi_device *device)
@@ -442,7 +444,6 @@ static void rbtn_remove(struct acpi_device *device)
}
rbtn_acquire(device, false);
- device->driver_data = NULL;
}
static void rbtn_notify(struct acpi_device *device, u32 event)
--
2.41.0
Hi,
On 6/13/23 10:43, Michal Wilczynski wrote:
> Currently rbtn_add() in case of failure is leaking resources. Fix this
> by adding a proper rollback. Move devm_kzalloc() before rbtn_acquire(),
> so it doesn't require rollback in case of failure. While at it, remove
> unnecessary assignment of NULL to device->driver_data and unnecessary
> whitespace, plus add a break for the default case in a switch.
>
> Suggested-by: Ilpo Järvinen <[email protected]>
> Fixes: 817a5cdb40c8 ("dell-rbtn: Dell Airplane Mode Switch driver")
> Signed-off-by: Michal Wilczynski <[email protected]>
> Reviewed-by: Andy Shevchenko <[email protected]>
> Acked-by: Rafael J. Wysocki <[email protected]>
> ---
> v2:
> - move devm_kzalloc before rbtn_acquire as suggested
Thank you for your patch, I've applied this patch to my review-hans
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans
Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.
Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.
Regards,
Hans
> drivers/platform/x86/dell/dell-rbtn.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/platform/x86/dell/dell-rbtn.c b/drivers/platform/x86/dell/dell-rbtn.c
> index aa0e6c907494..c8fcb537fd65 100644
> --- a/drivers/platform/x86/dell/dell-rbtn.c
> +++ b/drivers/platform/x86/dell/dell-rbtn.c
> @@ -395,16 +395,16 @@ static int rbtn_add(struct acpi_device *device)
> return -EINVAL;
> }
>
> + rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL);
> + if (!rbtn_data)
> + return -ENOMEM;
> +
> ret = rbtn_acquire(device, true);
> if (ret < 0) {
> dev_err(&device->dev, "Cannot enable device\n");
> return ret;
> }
>
> - rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL);
> - if (!rbtn_data)
> - return -ENOMEM;
> -
> rbtn_data->type = type;
> device->driver_data = rbtn_data;
>
> @@ -420,10 +420,12 @@ static int rbtn_add(struct acpi_device *device)
> break;
> default:
> ret = -EINVAL;
> + break;
> }
> + if (ret)
> + rbtn_acquire(device, false);
>
> return ret;
> -
> }
>
> static void rbtn_remove(struct acpi_device *device)
> @@ -442,7 +444,6 @@ static void rbtn_remove(struct acpi_device *device)
> }
>
> rbtn_acquire(device, false);
> - device->driver_data = NULL;
> }
>
> static void rbtn_notify(struct acpi_device *device, u32 event)
On Tue, Jun 13, 2023 at 11:43:10AM +0300, Michal Wilczynski wrote:
> Currently rbtn_add() in case of failure is leaking resources. Fix this
> by adding a proper rollback. Move devm_kzalloc() before rbtn_acquire(),
> so it doesn't require rollback in case of failure. While at it, remove
> unnecessary assignment of NULL to device->driver_data and unnecessary
> whitespace, plus add a break for the default case in a switch.
> Suggested-by: Ilpo J?rvinen <[email protected]>
Isn't also suggested by Pali?
> Fixes: 817a5cdb40c8 ("dell-rbtn: Dell Airplane Mode Switch driver")
> Signed-off-by: Michal Wilczynski <[email protected]>
> Reviewed-by: Andy Shevchenko <[email protected]>
> Acked-by: Rafael J. Wysocki <[email protected]>
...
Hans, can it (an additional tag) be folded into applied change?
--
With Best Regards,
Andy Shevchenko
On 6/13/2023 5:12 PM, Andy Shevchenko wrote:
> On Tue, Jun 13, 2023 at 11:43:10AM +0300, Michal Wilczynski wrote:
>> Currently rbtn_add() in case of failure is leaking resources. Fix this
>> by adding a proper rollback. Move devm_kzalloc() before rbtn_acquire(),
>> so it doesn't require rollback in case of failure. While at it, remove
>> unnecessary assignment of NULL to device->driver_data and unnecessary
>> whitespace, plus add a break for the default case in a switch.
>> Suggested-by: Ilpo Järvinen <[email protected]>
> Isn't also suggested by Pali?
Oh yeah, should have added a tag for Pali as well
>
>> Fixes: 817a5cdb40c8 ("dell-rbtn: Dell Airplane Mode Switch driver")
>> Signed-off-by: Michal Wilczynski <[email protected]>
>> Reviewed-by: Andy Shevchenko <[email protected]>
>> Acked-by: Rafael J. Wysocki <[email protected]>
> ...
>
> Hans, can it (an additional tag) be folded into applied change?
>
Hi,
On 6/13/23 17:12, Andy Shevchenko wrote:
> On Tue, Jun 13, 2023 at 11:43:10AM +0300, Michal Wilczynski wrote:
>> Currently rbtn_add() in case of failure is leaking resources. Fix this
>> by adding a proper rollback. Move devm_kzalloc() before rbtn_acquire(),
>> so it doesn't require rollback in case of failure. While at it, remove
>> unnecessary assignment of NULL to device->driver_data and unnecessary
>> whitespace, plus add a break for the default case in a switch.
>
>> Suggested-by: Ilpo Järvinen <[email protected]>
>
> Isn't also suggested by Pali?
>
>> Fixes: 817a5cdb40c8 ("dell-rbtn: Dell Airplane Mode Switch driver")
>> Signed-off-by: Michal Wilczynski <[email protected]>
>> Reviewed-by: Andy Shevchenko <[email protected]>
>> Acked-by: Rafael J. Wysocki <[email protected]>
>
> ...
>
> Hans, can it (an additional tag) be folded into applied change?
Done and pushed to review-hans.
Regards,
Hans
On Tuesday 13 June 2023 11:43:10 Michal Wilczynski wrote:
> Currently rbtn_add() in case of failure is leaking resources. Fix this
> by adding a proper rollback. Move devm_kzalloc() before rbtn_acquire(),
> so it doesn't require rollback in case of failure. While at it, remove
> unnecessary assignment of NULL to device->driver_data and unnecessary
> whitespace, plus add a break for the default case in a switch.
>
> Suggested-by: Ilpo Järvinen <[email protected]>
> Fixes: 817a5cdb40c8 ("dell-rbtn: Dell Airplane Mode Switch driver")
> Signed-off-by: Michal Wilczynski <[email protected]>
> Reviewed-by: Andy Shevchenko <[email protected]>
> Acked-by: Rafael J. Wysocki <[email protected]>
Looks good,
Reviewed-by: Pali Rohár <[email protected]>
> ---
> v2:
> - move devm_kzalloc before rbtn_acquire as suggested
>
> drivers/platform/x86/dell/dell-rbtn.c | 13 +++++++------
> 1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/platform/x86/dell/dell-rbtn.c b/drivers/platform/x86/dell/dell-rbtn.c
> index aa0e6c907494..c8fcb537fd65 100644
> --- a/drivers/platform/x86/dell/dell-rbtn.c
> +++ b/drivers/platform/x86/dell/dell-rbtn.c
> @@ -395,16 +395,16 @@ static int rbtn_add(struct acpi_device *device)
> return -EINVAL;
> }
>
> + rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL);
> + if (!rbtn_data)
> + return -ENOMEM;
> +
> ret = rbtn_acquire(device, true);
> if (ret < 0) {
> dev_err(&device->dev, "Cannot enable device\n");
> return ret;
> }
>
> - rbtn_data = devm_kzalloc(&device->dev, sizeof(*rbtn_data), GFP_KERNEL);
> - if (!rbtn_data)
> - return -ENOMEM;
> -
> rbtn_data->type = type;
> device->driver_data = rbtn_data;
>
> @@ -420,10 +420,12 @@ static int rbtn_add(struct acpi_device *device)
> break;
> default:
> ret = -EINVAL;
> + break;
> }
> + if (ret)
> + rbtn_acquire(device, false);
>
> return ret;
> -
> }
>
> static void rbtn_remove(struct acpi_device *device)
> @@ -442,7 +444,6 @@ static void rbtn_remove(struct acpi_device *device)
> }
>
> rbtn_acquire(device, false);
> - device->driver_data = NULL;
> }
>
> static void rbtn_notify(struct acpi_device *device, u32 event)
> --
> 2.41.0
>