USB:gadget:designware Fix memory nonalignment issue

While receiving packets from FIFO sometimes the buffer provided was
nonaligned. Fix this by taking a temporary aligned buffer and then
copying the content to nonaligned buffer.

Signed-off-by: Shiraz Hashim <shiraz.hashim@st.com>
Signed-off-by: Amit Virdi <amit.virdi@st.com>

diff --git a/drivers/usb/gadget/designware_udc.c b/drivers/usb/gadget/designware_udc.c
index 67cdb29..7e9ccde 100644 (file)
--- a/drivers/usb/gadget/designware_udc.c
+++ b/drivers/usb/gadget/designware_udc.c
@@ -202,6 +202,7 @@ static int usbgetpckfromfifo(int epNum, u8 *bufp, u32 len)
        u32 i, nw, nb;
        u32 *wrdp;
        u8 *bytp;
+       u32 tmp[128];
 
        if (readl(&udc_regs_p->dev_stat) & DEV_STAT_RXFIFO_EMPTY)
                return -1;
@@ -209,7 +210,12 @@ static int usbgetpckfromfifo(int epNum, u8 *bufp, u32 len)
        nw = len / sizeof(u32);
        nb = len % sizeof(u32);
 
-       wrdp = (u32 *)bufp;
+       /* use tmp buf if bufp is not word aligned */
+       if ((int)bufp & 0x3)
+               wrdp = (u32 *)&tmp[0];
+       else
+               wrdp = (u32 *)bufp;
+
        for (i = 0; i < nw; i++) {
                writel(readl(fifo_ptr), wrdp);
                wrdp++;
@@ -223,6 +229,10 @@ static int usbgetpckfromfifo(int epNum, u8 *bufp, u32 len)
        }
        readl(&outep_regs_p[epNum].write_done);
 
+       /* copy back tmp buffer to bufp if bufp is not word aligned */
+       if ((int)bufp & 0x3)
+               memcpy(bufp, tmp, len);
+
        return 0;
 }