UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

HID: usbhid: Simplify code in hid_submit_ctrl() 

This patch makes a small simplification to the code in
hid_submit_ctrl().  The test for maxpacket being > 0 is unnecessary,
because endpoint 0 always has a maxpacket value which is >= 8.

Furthermore, endpoint 0's maxpacket value is always a power of 2, so
instead of open-coding the round-to-next-multiple computation we can
call the optimized round_up() routine.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Tested-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Acked-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Alan Stern 2021-09-01 12:36:06 -04:00 committed by Jiri Kosina
parent 0a824efdb7
commit d2f311ec91
1 changed files with 4 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/hid/usbhid/hid-core.c
View File

@ -388,14 +388,10 @@ static int hid_submit_ctrl(struct hid_device *hid)
usbhid->urbctrl->pipe = usb_rcvctrlpipe(hid_to_usb_dev(hid), 0);
maxpacket = usb_maxpacket(hid_to_usb_dev(hid),
usbhid->urbctrl->pipe, 0);
if (maxpacket > 0) {
len += (len == 0); /* Don't allow 0-length reports */
len = DIV_ROUND_UP(len, maxpacket);
len *= maxpacket;
if (len > usbhid->bufsize)
len = usbhid->bufsize;
} else
len = 0;
len += (len == 0); /* Don't allow 0-length reports */
len = round_up(len, maxpacket);
if (len > usbhid->bufsize)
len = usbhid->bufsize;
}
usbhid->urbctrl->transfer_buffer_length = len;
usbhid->urbctrl->dev = hid_to_usb_dev(hid);