From: Michal Nazarewicz <mina86@xxxxxxxxxx>
The usb_create_sysfs_intf_files() function always returned zero even
if it failed to create sysfs fails. Since this is a desired behaviour
there is no need to return return code at all. This commit changes
function's return type (form int) to void.
Signed-off-by: Michal Nazarewicz <mina86@xxxxxxxxxx>
Cc: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx>
---
drivers/usb/core/sysfs.c | 7 +++----
drivers/usb/core/usb.c | 3 +--
drivers/usb/core/usb.h | 2 +-
3 files changed, 5 insertions(+), 7 deletions(-)
The below patch has not been tested (not even compiled), just a quick scatch.
> On Thu, 24 Mar 2011, Sergey Senozhatsky wrote:
>> I just noticed that usb_create_sysfs_intf_files() ignores
>> device_create_file() return code and sets intf->sysfs_files_created
>> to 1, even if sysfs_add_file_mode() returned -ENOMEM (or later
>> sysfs_add_one() returned -EEXIST).
>>
>> Shouldn't we check retval for 0 before setting
>> intf->sysfs_files_created?
On Thu, 24 Mar 2011 15:55:08 +0100, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> No. We want this routine to succeed even if the sysfs files can't be
> created. The interface string attribute is more or less optional.
>
> It would be okay to add a comment explaining this, so that other people
> don't make the same mistake (which has already happened -- you're not
> the first).
Can we also drop the return value completely then?
diff --git a/drivers/usb/core/sysfs.c b/drivers/usb/core/sysfs.c
index 6781c36..e729480 100644
--- a/drivers/usb/core/sysfs.c
+++ b/drivers/usb/core/sysfs.c
@@ -842,11 +842,10 @@ const struct attribute_group *usb_interface_groups[] = {
NULL
};
-int usb_create_sysfs_intf_files(struct usb_interface *intf)
+void usb_create_sysfs_intf_files(struct usb_interface *intf)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_host_interface *alt = intf->cur_altsetting;
- int retval;
if (intf->sysfs_files_created || intf->unregistering)
return 0;
@@ -855,9 +854,9 @@ int usb_create_sysfs_intf_files(struct usb_interface *intf)
!(udev->quirks & USB_QUIRK_CONFIG_INTF_STRINGS))
alt->string = usb_cache_string(udev, alt->desc.iInterface);
if (alt->string)
- retval = device_create_file(&intf->dev, &dev_attr_interface);
+ /* We don't care if the function actually fails. */
+ device_create_file(&intf->dev, &dev_attr_interface);
intf->sysfs_files_created = 1;
- return 0;
}
void usb_remove_sysfs_intf_files(struct usb_interface *intf)
diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
index 079cb57..08b74f8 100644
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -948,8 +948,7 @@ static int usb_bus_notify(struct notifier_block *nb, unsigned long action,
if (dev->type == &usb_device_type)
(void) usb_create_sysfs_dev_files(to_usb_device(dev));
else if (dev->type == &usb_if_device_type)
- (void) usb_create_sysfs_intf_files(
- to_usb_interface(dev));
+ usb_create_sysfs_intf_files(to_usb_interface(dev));
break;
case BUS_NOTIFY_DEL_DEVICE:
diff --git a/drivers/usb/core/usb.h b/drivers/usb/core/usb.h
index a9cf484..d51ab6a 100644
--- a/drivers/usb/core/usb.h
+++ b/drivers/usb/core/usb.h
@@ -4,7 +4,7 @@
extern int usb_create_sysfs_dev_files(struct usb_device *dev);
extern void usb_remove_sysfs_dev_files(struct usb_device *dev);
-extern int usb_create_sysfs_intf_files(struct usb_interface *intf);
+extern void usb_create_sysfs_intf_files(struct usb_interface *intf);
extern void usb_remove_sysfs_intf_files(struct usb_interface *intf);
extern int usb_create_ep_devs(struct device *parent,
struct usb_host_endpoint *endpoint,
--
1.7.3.1
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