openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

USB: dummy-hcd: accept mismatch between wLength and transfer length 

This patch (as1269) fixes a bug in the way dummy_hcd handles control
URBs.  Currently it returns a -EOVERFLOW error if the wLength value in
the setup packet is different from the URB's transfer_buffer_length.

Other host controller drivers don't do this.  There's no reason the
two length values have to be equal, and in fact they sometimes aren't
-- a driver might set the transfer length to the maxpacket value in
order to handle buggy devices that don't respect wLength.

This patch simply removes the unnecessary check and error return.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2009-07-22 14:44:17 -04:00 committed by Greg Kroah-Hartman
parent 527101ce6a
commit e9238221d3
1 changed files with 0 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/usb/gadget/dummy_hcd.c
View File

@ -1306,11 +1306,6 @@ static void dummy_timer (unsigned long _dum)
setup = *(struct usb_ctrlrequest*) urb->setup_packet;
w_index = le16_to_cpu(setup.wIndex);
w_value = le16_to_cpu(setup.wValue);
if (le16_to_cpu(setup.wLength) !=
urb->transfer_buffer_length) {
status = -EOVERFLOW;
goto return_urb;
}
/* paranoia, in case of stale queued data */
list_for_each_entry (req, &ep->queue, queue) {