usb: isp1760: fix qtd fill length

When trying to send bulks bigger than the biggest block size
we need to split them over several qtd. Fix this limiting the
maximum qtd size to largest block size.

Reported-by: Dietmar Eggemann <[email protected]>
Tested-by: Dietmar Eggemann <[email protected]>
Signed-off-by: Rui Miguel Silva <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: rmsilva

drivers/usb/isp1760/isp1760-hcd.c

@@ -1829,9 +1829,11 @@ static void packetize_urb(struct usb_hcd *hcd,
 			goto cleanup;
 
 		if (len > mem->blocks_size[ISP176x_BLOCK_NUM - 1])
-			len = mem->blocks_size[ISP176x_BLOCK_NUM - 1];
+			this_qtd_len = mem->blocks_size[ISP176x_BLOCK_NUM - 1];
+		else
+			this_qtd_len = len;
 
-		this_qtd_len = qtd_fill(qtd, buf, len);
+		this_qtd_len = qtd_fill(qtd, buf, this_qtd_len);
 		list_add_tail(&qtd->qtd_list, head);
 
 		len -= this_qtd_len;