linux-kernel - [42/65] xHCI: Cleanup isoc transfer ring when TD length mismatch found

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Date:	Wed, 01 Feb 2012 12:56:22 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Andiry Xu <andiry.xu@....com>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Subject: [42/65] xHCI: Cleanup isoc transfer ring when TD length mismatch found

3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Andiry Xu <andiry.xu@....com>

commit cf840551a884360841bd3d3ce1ad0868ff0b759a upstream.

When a TD length mismatch is found during isoc TRB enqueue, it directly
returns -EINVAL. However, isoc transfer is partially enqueued at this time,
and the ring should be cleared.

This should be backported to kernels as old as 2.6.36, which contain the
commit 522989a27c7badb608155b1f1dea3487ed431f74 "xhci: Fix failed
enqueue in the middle of isoch TD."

Signed-off-by: Andiry Xu <andiry.xu@....com>
Signed-off-by: Sarah Sharp <sarah.a.sharp@...ux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/host/xhci-ring.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/usb/host/xhci-ring.c
+++ b/drivers/usb/host/xhci-ring.c
@@ -3382,7 +3382,8 @@ static int xhci_queue_isoc_tx(struct xhc
 		/* Check TD length */
 		if (running_total != td_len) {
 			xhci_err(xhci, "ISOC TD length unmatch\n");
-			return -EINVAL;
+			ret = -EINVAL;
+			goto cleanup;
 		}
 	}
 


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