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USB: UDC: net22{80,72}: remove mistaken test of req->zero 

The net2280 UDC driver (and also net2272, probably via copy-and-paste)
incorrectly checks the req->zero flag during OUT transfers, after
copying data from the UDC's FIFO into memory.  This makes no sense at
all; the "zero" flag indicates that an extra zero-length packet should
be appended to an IN transfer if the length is an even multiple of the
maxpacket size.  It has nothing to do with OUT transfers.

In practice this doesn't cause any problems because gadget drivers
never set req->zero for OUT transfers anyway.  Still, it is an error
and unnecessary code, so this patch removes the check.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Alan Stern 2019-04-15 13:35:46 -04:00 committed by Felipe Balbi
parent 6574abe699
commit de497f6346
2 changed files with 2 additions and 4 deletions
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3
drivers/usb/gadget/udc/net2272.c
View File

@ -573,8 +573,7 @@ net2272_read_fifo(struct net2272_ep *ep, struct net2272_request *req)
/* completion */
if (unlikely(cleanup || is_short ||
((req->req.actual == req->req.length)
&& !req->req.zero))) {
req->req.actual == req->req.length)) {
if (cleanup) {
net2272_out_flush(ep);

3
drivers/usb/gadget/udc/net2280.c
View File

@ -789,8 +789,7 @@ static int read_fifo(struct net2280_ep *ep, struct net2280_request *req)
(void) readl(&ep->regs->ep_rsp);
}
return is_short || ((req->req.actual == req->req.length) &&
!req->req.zero);
return is_short || req->req.actual == req->req.length;
}
/* fill out dma descriptor to match a given request */