From: Johan Hovold <johan@kernel.org>
Date: Thu, 23 Apr 2015 14:06:52 +0000 (+0200)
Subject: staging: octeon-usb: fix unaligned isochronous transfers
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b97c3c1a0b538a61fb1cab057738ccb64ae51e4d;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

staging: octeon-usb: fix unaligned isochronous transfers

Make sure to copy the whole transfer buffer when releasing the temporary
buffer used for unaligned isochronous transfers as the data is not
necessarily contiguous in that case.

Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/staging/octeon-usb/octeon-hcd.c b/drivers/staging/octeon-usb/octeon-hcd.c
index 9e5476e352b4..cdb0981be2e9 100644
--- a/drivers/staging/octeon-usb/octeon-hcd.c
+++ b/drivers/staging/octeon-usb/octeon-hcd.c
@@ -499,15 +499,21 @@ static int octeon_alloc_temp_buffer(struct urb *urb, gfp_t mem_flags)
 static void octeon_free_temp_buffer(struct urb *urb)
 {
 	struct octeon_temp_buffer *temp;
+	size_t length;
 
 	if (!(urb->transfer_flags & URB_ALIGNED_TEMP_BUFFER))
 		return;
 
 	temp = container_of(urb->transfer_buffer, struct octeon_temp_buffer,
 			    data);
-	if (usb_urb_dir_in(urb))
-		memcpy(temp->orig_buffer, urb->transfer_buffer,
-		       urb->actual_length);
+	if (usb_urb_dir_in(urb)) {
+		if (usb_pipeisoc(urb->pipe))
+			length = urb->transfer_buffer_length;
+		else
+			length = urb->actual_length;
+
+		memcpy(temp->orig_buffer, urb->transfer_buffer, length);
+	}
 	urb->transfer_buffer = temp->orig_buffer;
 	urb->transfer_flags &= ~URB_ALIGNED_TEMP_BUFFER;
 	kfree(temp);