[PATCH v4 1/3] driver core: Provide device_match_acpi_handle() helper

[PATCH v4 1/3] driver core: Provide device_match_acpi_handle() helper

[Andy Shevchenko]

We have a couple of users of this helper, make it available for them.

The prototype for the helper is specifically crafted in order to be
easily used with bus_find_device() call. That's why its location is
in the driver core rather than ACPI.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v4: amended changelog to clarify implementation details (Rafael)
 drivers/base/core.c        | 6 ++++++
 include/linux/device/bus.h | 1 +
 2 files changed, 7 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index b67ebe6a323c..fd034d742447 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -4838,6 +4838,12 @@ int device_match_acpi_dev(struct device *dev, const void *adev)
 }
 EXPORT_SYMBOL(device_match_acpi_dev);
 
+int device_match_acpi_handle(struct device *dev, const void *handle)
+{
+	return ACPI_HANDLE(dev) == handle;
+}
+EXPORT_SYMBOL(device_match_acpi_handle);
+
 int device_match_any(struct device *dev, const void *unused)
 {
 	return 1;
diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h
index 062777a45a74..a039ab809753 100644
--- a/include/linux/device/bus.h
+++ b/include/linux/device/bus.h
@@ -143,6 +143,7 @@ int device_match_of_node(struct device *dev, const void *np);
 int device_match_fwnode(struct device *dev, const void *fwnode);
 int device_match_devt(struct device *dev, const void *pdevt);
 int device_match_acpi_dev(struct device *dev, const void *adev);
+int device_match_acpi_handle(struct device *dev, const void *handle);
 int device_match_any(struct device *dev, const void *unused);
 
 /* iterator helpers for buses */
-- 
2.33.0

[PATCH v4 2/3] i2c: acpi: Replace custom function with device_match_acpi_handle()

[Andy Shevchenko]

Since driver core provides a generic device_match_acpi_handle()
we may replace the custom one with it. This unifies code to find
an adapter with the similar one which finds a client.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Wolfram Sang <wsa@kernel.org>
---
v4: added tag (Wolfram)
 drivers/i2c/i2c-core-acpi.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/drivers/i2c/i2c-core-acpi.c b/drivers/i2c/i2c-core-acpi.c
index 7ea2ac712a57..0aea776cd4c9 100644
--- a/drivers/i2c/i2c-core-acpi.c
+++ b/drivers/i2c/i2c-core-acpi.c
@@ -398,24 +398,20 @@ u32 i2c_acpi_find_bus_speed(struct device *dev)
 }
 EXPORT_SYMBOL_GPL(i2c_acpi_find_bus_speed);
 
-static int i2c_acpi_find_match_adapter(struct device *dev, const void *data)
-{
-	struct i2c_adapter *adapter = i2c_verify_adapter(dev);
-
-	if (!adapter)
-		return 0;
-
-	return ACPI_HANDLE(dev) == (acpi_handle)data;
-}
-
 struct i2c_adapter *i2c_acpi_find_adapter_by_handle(acpi_handle handle)
 {
+	struct i2c_adapter *adapter;
 	struct device *dev;
 
-	dev = bus_find_device(&i2c_bus_type, NULL, handle,
-			      i2c_acpi_find_match_adapter);
+	dev = bus_find_device(&i2c_bus_type, NULL, handle, device_match_acpi_handle);
+	if (!dev)
+		return NULL;
+
+	adapter = i2c_verify_adapter(dev);
+	if (!adapter)
+		put_device(dev);
 
-	return dev ? i2c_verify_adapter(dev) : NULL;
+	return adapter;
 }
 EXPORT_SYMBOL_GPL(i2c_acpi_find_adapter_by_handle);
 
-- 
2.33.0

[PATCH v4 3/3] gpiolib: acpi: Replace custom code with device_match_acpi_handle()

[Andy Shevchenko]

Since driver core provides a generic device_match_acpi_handle()
we may replace the custom code with it.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
---
v4: no changes
 drivers/gpio/gpiolib-acpi.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
index 47712b6903b5..985e8589c58b 100644
--- a/drivers/gpio/gpiolib-acpi.c
+++ b/drivers/gpio/gpiolib-acpi.c
@@ -95,10 +95,7 @@ static bool acpi_gpio_deferred_req_irqs_done;
 
 static int acpi_gpiochip_find(struct gpio_chip *gc, void *data)
 {
-	if (!gc->parent)
-		return false;
-
-	return ACPI_HANDLE(gc->parent) == data;
+	return gc->parent && device_match_acpi_handle(gc->parent, data);
 }
 
 /**
-- 
2.33.0

Re: [PATCH v4 1/3] driver core: Provide device_match_acpi_handle() helper

[Rafael J. Wysocki]

On Thu, Oct 14, 2021 at 3:48 PM Andy Shevchenko
<andriy.shevchenko@linux.intel.com> wrote:
>
> We have a couple of users of this helper, make it available for them.
>
> The prototype for the helper is specifically crafted in order to be
> easily used with bus_find_device() call. That's why its location is
> in the driver core rather than ACPI.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>

OK, please feel free to add

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

to all of the patches in this series.

> ---
> v4: amended changelog to clarify implementation details (Rafael)
>  drivers/base/core.c        | 6 ++++++
>  include/linux/device/bus.h | 1 +
>  2 files changed, 7 insertions(+)
>
> diff --git a/drivers/base/core.c b/drivers/base/core.c
> index b67ebe6a323c..fd034d742447 100644
> --- a/drivers/base/core.c
> +++ b/drivers/base/core.c
> @@ -4838,6 +4838,12 @@ int device_match_acpi_dev(struct device *dev, const void *adev)
>  }
>  EXPORT_SYMBOL(device_match_acpi_dev);
>
> +int device_match_acpi_handle(struct device *dev, const void *handle)
> +{
> +       return ACPI_HANDLE(dev) == handle;
> +}
> +EXPORT_SYMBOL(device_match_acpi_handle);
> +
>  int device_match_any(struct device *dev, const void *unused)
>  {
>         return 1;
> diff --git a/include/linux/device/bus.h b/include/linux/device/bus.h
> index 062777a45a74..a039ab809753 100644
> --- a/include/linux/device/bus.h
> +++ b/include/linux/device/bus.h
> @@ -143,6 +143,7 @@ int device_match_of_node(struct device *dev, const void *np);
>  int device_match_fwnode(struct device *dev, const void *fwnode);
>  int device_match_devt(struct device *dev, const void *pdevt);
>  int device_match_acpi_dev(struct device *dev, const void *adev);
> +int device_match_acpi_handle(struct device *dev, const void *handle);
>  int device_match_any(struct device *dev, const void *unused);
>
>  /* iterator helpers for buses */
> --
> 2.33.0
>

Re: [PATCH v4 1/3] driver core: Provide device_match_acpi_handle() helper

[Andy Shevchenko]

On Fri, Oct 15, 2021 at 01:42:37PM +0200, Rafael J. Wysocki wrote:
> On Thu, Oct 14, 2021 at 3:48 PM Andy Shevchenko
> <andriy.shevchenko@linux.intel.com> wrote:
> >
> > We have a couple of users of this helper, make it available for them.
> >
> > The prototype for the helper is specifically crafted in order to be
> > easily used with bus_find_device() call. That's why its location is
> > in the driver core rather than ACPI.
> >
> > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> 
> OK, please feel free to add
> 
> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> to all of the patches in this series.

Thank you, Rafael!

Greg, can it be applied now?

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH v4 1/3] driver core: Provide device_match_acpi_handle() helper

[Greg Kroah-Hartman]

On Tue, Oct 19, 2021 at 03:01:14PM +0300, Andy Shevchenko wrote:
> On Fri, Oct 15, 2021 at 01:42:37PM +0200, Rafael J. Wysocki wrote:
> > On Thu, Oct 14, 2021 at 3:48 PM Andy Shevchenko
> > <andriy.shevchenko@linux.intel.com> wrote:
> > >
> > > We have a couple of users of this helper, make it available for them.
> > >
> > > The prototype for the helper is specifically crafted in order to be
> > > easily used with bus_find_device() call. That's why its location is
> > > in the driver core rather than ACPI.
> > >
> > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> > 
> > OK, please feel free to add
> > 
> > Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> > 
> > to all of the patches in this series.
> 
> Thank you, Rafael!
> 
> Greg, can it be applied now?

Yes, will go do so now, thanks.

greg k-h