linux-kernel - [PATCH] usb: core: Remove the useless struct usb

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Message-ID: <1d818575ff7a1e8317674aecf761ee23c89fdc84.1714815990.git.christophe.jaillet@wanadoo.fr>
Date: Sat,  4 May 2024 11:47:05 +0200
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	linux-usb@...r.kernel.org
Subject: [PATCH] usb: core: Remove the useless struct usb_devmap which is just a bitmap

struct usb_devmap is really just a bitmap. No need to have a dedicated
structure for that.

Simplify code and use DECLARE_BITMAP() directly instead.

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested only.

I've re-used the comment related to struct usb_devmap for the devmap field
in struct usb_bus, because it sounds better to me.
---
 drivers/usb/core/hcd.c | 4 ++--
 drivers/usb/core/hub.c | 9 ++++-----
 include/linux/usb.h    | 7 +------
 3 files changed, 7 insertions(+), 13 deletions(-)

diff --git a/drivers/usb/core/hcd.c b/drivers/usb/core/hcd.c
index c0e005670d67..e3366f4d82b9 100644
--- a/drivers/usb/core/hcd.c
+++ b/drivers/usb/core/hcd.c
@@ -866,7 +866,7 @@ static int usb_rh_urb_dequeue(struct usb_hcd *hcd, struct urb *urb, int status)
  */
 static void usb_bus_init (struct usb_bus *bus)
 {
-	memset (&bus->devmap, 0, sizeof(struct usb_devmap));
+	memset(&bus->devmap, 0, sizeof(bus->devmap));
 
 	bus->devnum_next = 1;
 
@@ -962,7 +962,7 @@ static int register_root_hub(struct usb_hcd *hcd)
 
 	usb_dev->devnum = devnum;
 	usb_dev->bus->devnum_next = devnum + 1;
-	set_bit (devnum, usb_dev->bus->devmap.devicemap);
+	set_bit(devnum, usb_dev->bus->devmap);
 	usb_set_device_state(usb_dev, USB_STATE_ADDRESS);
 
 	mutex_lock(&usb_bus_idr_lock);
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 8939f1410644..4b93c0bd1d4b 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -2207,13 +2207,12 @@ static void choose_devnum(struct usb_device *udev)
 	mutex_lock(&bus->devnum_next_mutex);
 
 	/* Try to allocate the next devnum beginning at bus->devnum_next. */
-	devnum = find_next_zero_bit(bus->devmap.devicemap, 128,
-			bus->devnum_next);
+	devnum = find_next_zero_bit(bus->devmap, 128, bus->devnum_next);
 	if (devnum >= 128)
-		devnum = find_next_zero_bit(bus->devmap.devicemap, 128, 1);
+		devnum = find_next_zero_bit(bus->devmap, 128, 1);
 	bus->devnum_next = (devnum >= 127 ? 1 : devnum + 1);
 	if (devnum < 128) {
-		set_bit(devnum, bus->devmap.devicemap);
+		set_bit(devnum, bus->devmap);
 		udev->devnum = devnum;
 	}
 	mutex_unlock(&bus->devnum_next_mutex);
@@ -2222,7 +2221,7 @@ static void choose_devnum(struct usb_device *udev)
 static void release_devnum(struct usb_device *udev)
 {
 	if (udev->devnum > 0) {
-		clear_bit(udev->devnum, udev->bus->devmap.devicemap);
+		clear_bit(udev->devnum, udev->bus->devmap);
 		udev->devnum = -1;
 	}
 }
diff --git a/include/linux/usb.h b/include/linux/usb.h
index 9e52179872a5..1913a13833f2 100644
--- a/include/linux/usb.h
+++ b/include/linux/usb.h
@@ -440,11 +440,6 @@ int __usb_get_extra_descriptor(char *buffer, unsigned size,
 
 /* ----------------------------------------------------------------------- */
 
-/* USB device number allocation bitmap */
-struct usb_devmap {
-	unsigned long devicemap[128 / (8*sizeof(unsigned long))];
-};
-
 /*
  * Allocated per bus (tree of devices) we have:
  */
@@ -472,7 +467,7 @@ struct usb_bus {
 					 * round-robin allocation */
 	struct mutex devnum_next_mutex; /* devnum_next mutex */
 
-	struct usb_devmap devmap;	/* device address allocation map */
+	DECLARE_BITMAP(devmap, 128);	/* USB device number allocation bitmap */
 	struct usb_device *root_hub;	/* Root hub */
 	struct usb_bus *hs_companion;	/* Companion EHCI bus, if any */
 
-- 
2.45.0