driver core: Move the "removable" attribute from USB to core

Move the "removable" attribute from USB to core in order to allow it to be
supported by other subsystem / buses. Individual buses that want to support
this attribute can populate the removable property of the device while
enumerating it with the 3 possible values -
 - "unknown"
 - "fixed"
 - "removable"
Leaving the field unchanged (i.e. "not supported") would mean that the
attribute would not show up in sysfs for that device. The UAPI (location,
symantics etc) for the attribute remains unchanged.

Move the "removable" attribute from USB to the device core so it can be
used by other subsystems / buses.

By default, devices do not have a "removable" attribute in sysfs.

If a subsystem or bus driver wants to support a "removable" attribute, it
should call device_set_removable() before calling device_register() or
device_add(), e.g.:

    device_set_removable(dev, DEVICE_REMOVABLE);
    device_register(dev);

The possible values and the resulting sysfs attribute contents are:

    DEVICE_REMOVABLE_UNKNOWN  ->  "unknown"
    DEVICE_REMOVABLE          ->  "removable"
    DEVICE_FIXED              ->  "fixed"

Convert the USB "removable" attribute to use this new device core
functionality.  There should be no user-visible change in the location or
semantics of attribute for USB devices.

Reviewed-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Rajat Jain <rajatja@google.com>
Link: https://lore.kernel.org/r/20210524171812.18095-1-rajatja@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 7 deletions

diff --git a/include/linux/usb.h b/include/linux/usb.h
index 4db6b824af5c..7ccaa76a9a96 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -473,12 +473,6 @@ struct usb_dev_state;
 
 struct usb_tt;
 
-enum usb_device_removable {
-	USB_DEVICE_REMOVABLE_UNKNOWN = 0,
-	USB_DEVICE_REMOVABLE,
-	USB_DEVICE_FIXED,
-};
-
 enum usb_port_connect_type {
 	USB_PORT_CONNECT_TYPE_UNKNOWN = 0,
 	USB_PORT_CONNECT_TYPE_HOT_PLUG,
@@ -703,7 +697,6 @@ struct usb_device {
 #endif
 	struct wusb_dev *wusb_dev;
 	int slot_id;
-	enum usb_device_removable removable;
 	struct usb2_lpm_parameters l1_params;
 	struct usb3_lpm_parameters u1_params;
 	struct usb3_lpm_parameters u2_params;