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usb: Clarify expected behavior of dev_bin_attrs_are_visible() 

The commit "usb: Export BOS descriptor to sysfs" added a binary attribute
group to sysfs. It doesn't check if the descriptors attribute should be
visible, which is by design and not an oversight. Update a comment so that
it better explains this in the dev_bin_attrs_are_visible() function.

Signed-off-by: Elbert Mai <code@elbertmai.com>
Link: https://lore.kernel.org/r/20240306001503.313028-1-code@elbertmai.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Elbert Mai 2024-03-05 16:15:03 -08:00 committed by Greg Kroah-Hartman
parent 28cbed4960
commit dfea18989a
1 changed files with 5 additions and 2 deletions
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7
drivers/usb/core/sysfs.c
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@ -929,8 +929,11 @@ static umode_t dev_bin_attrs_are_visible(struct kobject *kobj,
struct device *dev = kobj_to_dev(kobj);
struct usb_device *udev = to_usb_device(dev);
/* All USB devices have a device descriptor, so the descriptors
* attribute always exists. No need to check for its visibility.
/*
* There's no need to check if the descriptors attribute should
* be visible because all devices have a device descriptor. The
* bos_descriptors attribute should be visible if and only if
* the device has a BOS, so check if it exists here.
*/
if (a == &bin_attr_bos_descriptors) {
if (udev->bos == NULL)