USB: minor fixes for r8a66597 driver

This patch (as967) makes a few relatively minor changes to the
r8a66597 driver:

	finish_request() does nothing but call done(), so merge the
	two routines.

	Detect and report -EOVERFLOW errors.

	Fix the calculation that checks for short packets.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Yoshihiro Shimoda <shimoda.yoshihiro@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/drivers/usb/host/r8a66597-hcd.c b/drivers/usb/host/r8a66597-hcd.c
index 94bb229..49cf998 100644 (file)
--- a/drivers/usb/host/r8a66597-hcd.c
+++ b/drivers/usb/host/r8a66597-hcd.c
@@ -1109,8 +1109,9 @@ static void set_td_timer(struct r8a66597 *r8a66597, struct r8a66597_td *td)
 }
 
 /* this function must be called with interrupt disabled */
-static void done(struct r8a66597 *r8a66597, struct r8a66597_td *td,
-                u16 pipenum, struct urb *urb)
+static void finish_request(struct r8a66597 *r8a66597, struct r8a66597_td *td,
+               u16 pipenum, struct urb *urb)
+__releases(r8a66597->lock) __acquires(r8a66597->lock)
 {
        int restart = 0;
        struct usb_hcd *hcd = r8a66597_to_hcd(r8a66597);
@@ -1151,14 +1152,6 @@ static void done(struct r8a66597 *r8a66597, struct r8a66597_td *td,
        }
 }
 
-/* this function must be called with interrupt disabled */
-static void finish_request(struct r8a66597 *r8a66597, struct r8a66597_td *td,
-                          u16 pipenum, struct urb *urb)
-__releases(r8a66597->lock) __acquires(r8a66597->lock)
-{
-       done(r8a66597, td, pipenum, urb);
-}
-
 static void packet_read(struct r8a66597 *r8a66597, u16 pipenum)
 {
        u16 tmp;
@@ -1167,6 +1160,7 @@ static void packet_read(struct r8a66597 *r8a66597, u16 pipenum)
        struct r8a66597_td *td = r8a66597_get_td(r8a66597, pipenum);
        struct urb *urb;
        int finish = 0;
+       int status = 0;
 
        if (unlikely(!td))
                return;
@@ -1185,7 +1179,6 @@ static void packet_read(struct r8a66597 *r8a66597, u16 pipenum)
 
        /* prepare parameters */
        rcv_len = tmp & DTLN;
-       bufsize = td->maxpacket;
        if (usb_pipeisoc(urb->pipe)) {
                buf = (u16 *)(urb->transfer_buffer +
                                urb->iso_frame_desc[td->iso_cnt].offset);
@@ -1194,25 +1187,30 @@ static void packet_read(struct r8a66597 *r8a66597, u16 pipenum)
                buf = (void *)urb->transfer_buffer + urb->actual_length;
                urb_len = urb->transfer_buffer_length - urb->actual_length;
        }
-       if (rcv_len < bufsize)
-               size = min(rcv_len, urb_len);
-       else
-               size = min(bufsize, urb_len);
+       bufsize = min(urb_len, (int) td->maxpacket);
+       if (rcv_len <= bufsize) {
+               size = rcv_len;
+       } else {
+               size = bufsize;
+               status = -EOVERFLOW;
+               finish = 1;
+       }
 
        /* update parameters */
        urb->actual_length += size;
        if (rcv_len == 0)
                td->zero_packet = 1;
-       if ((size % td->maxpacket) > 0) {
+       if (rcv_len < bufsize) {
                td->short_packet = 1;
                if (urb->transfer_buffer_length != urb->actual_length &&
                    urb->transfer_flags & URB_SHORT_NOT_OK)
-                       td->urb->status = -EREMOTEIO;
+                       status = -EREMOTEIO;
        }
        if (usb_pipeisoc(urb->pipe)) {
                urb->iso_frame_desc[td->iso_cnt].actual_length = size;
-               urb->iso_frame_desc[td->iso_cnt].status = 0;
+               urb->iso_frame_desc[td->iso_cnt].status = status;
                td->iso_cnt++;
+               finish = 0;
        }
 
        /* check transfer finish */
@@ -1233,7 +1231,7 @@ static void packet_read(struct r8a66597 *r8a66597, u16 pipenum)
 
        if (finish && pipenum != 0) {
                if (td->urb->status == -EINPROGRESS)
-                       td->urb->status = 0;
+                       td->urb->status = status;
                finish_request(r8a66597, td, pipenum, urb);
        }
 }
@@ -1807,7 +1805,7 @@ static int r8a66597_urb_dequeue(struct usb_hcd *hcd, struct urb *urb,
                pipe_stop(r8a66597, td->pipe);
                pipe_irq_disable(r8a66597, td->pipenum);
                disable_irq_empty(r8a66597, td->pipenum);
-               done(r8a66597, td, td->pipenum, urb);
+               finish_request(r8a66597, td, td->pipenum, urb);
        }
  done:
        spin_unlock_irqrestore(&r8a66597->lock, flags);
@@ -1841,7 +1839,7 @@ static void r8a66597_endpoint_disable(struct usb_hcd *hcd,
        td = r8a66597_get_td(r8a66597, pipenum);
        if (td)
                urb = td->urb;
-       done(r8a66597, td, pipenum, urb);
+       finish_request(r8a66597, td, pipenum, urb);
        kfree(hep->hcpriv);
        hep->hcpriv = NULL;
        spin_unlock_irqrestore(&r8a66597->lock, flags);