diff mbox series

[v1,05/16] USB: ACPI: Use acpi_find_child_by_adr()

Message ID 3459925.iIbC2pHGDl@kreacher
State New
Headers show
Series ACPI: Get rid of the list of children in struct acpi_device | expand

Commit Message

Rafael J. Wysocki June 9, 2022, 1:56 p.m. UTC 
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Instead of walking the list of children of an ACPI device directly
in order to find the child matching a given bus address, use
acpi_find_child_by_adr() for this purpose.

Apart from simplifying the code, this will help to eliminate the
children list head from struct acpi_device as it is redundant and it
is used in questionable ways in some places (in particular, locking is
needed for walking the list pointed to it safely, but it is often
missing).

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/usb/core/usb-acpi.c |    9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

Comments

Heikki Krogerus June 10, 2022, 6:47 a.m. UTC | #1 
On Thu, Jun 09, 2022 at 03:56:42PM +0200, Rafael J. Wysocki wrote:
> From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> 
> Instead of walking the list of children of an ACPI device directly
> in order to find the child matching a given bus address, use
> acpi_find_child_by_adr() for this purpose.
> 
> Apart from simplifying the code, this will help to eliminate the
> children list head from struct acpi_device as it is redundant and it
> is used in questionable ways in some places (in particular, locking is
> needed for walking the list pointed to it safely, but it is often
> missing).
> 
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
> ---
>  drivers/usb/core/usb-acpi.c |    9 +--------
>  1 file changed, 1 insertion(+), 8 deletions(-)
> 
> Index: linux-pm/drivers/usb/core/usb-acpi.c
> ===================================================================
> --- linux-pm.orig/drivers/usb/core/usb-acpi.c
> +++ linux-pm/drivers/usb/core/usb-acpi.c
> @@ -127,17 +127,10 @@ out:
>  static struct acpi_device *usb_acpi_find_port(struct acpi_device *parent,
>  					      int raw)
>  {
> -	struct acpi_device *adev;
> -
>  	if (!parent)
>  		return NULL;
>  
> -	list_for_each_entry(adev, &parent->children, node) {
> -		if (acpi_device_adr(adev) == raw)
> -			return adev;
> -	}
> -
> -	return acpi_find_child_device(parent, raw, false);
> +	return acpi_find_child_by_adr(parent, raw);
>  }
>  
>  static struct acpi_device *

I think usb_acpi_find_port() can also be dropped now.

thanks,
diff mbox series

Patch

Index: linux-pm/drivers/usb/core/usb-acpi.c
===================================================================
--- linux-pm.orig/drivers/usb/core/usb-acpi.c
+++ linux-pm/drivers/usb/core/usb-acpi.c
@@ -127,17 +127,10 @@  out:
 static struct acpi_device *usb_acpi_find_port(struct acpi_device *parent,
 					      int raw)
 {
-	struct acpi_device *adev;
-
 	if (!parent)
 		return NULL;
 
-	list_for_each_entry(adev, &parent->children, node) {
-		if (acpi_device_adr(adev) == raw)
-			return adev;
-	}
-
-	return acpi_find_child_device(parent, raw, false);
+	return acpi_find_child_by_adr(parent, raw);
 }
 
 static struct acpi_device *