Patch "staging: fsl-dpaa2/eth: Account for Rx FD buffers on error path" has been added to the 4.14-stable tree

This is a note to let you know that I've just added the patch titled

staging: fsl-dpaa2/eth: Account for Rx FD buffers on error path

to the 4.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
staging-fsl-dpaa2-eth-account-for-rx-fd-buffers-on-error-path.patch
and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Ioana Radulescu <[email protected]>
Date: Wed, 11 Oct 2017 08:29:44 -0500
Subject: staging: fsl-dpaa2/eth: Account for Rx FD buffers on error path

From: Ioana Radulescu <[email protected]>

[ Upstream commit cbb3ea40fc495bf04070200b35c1c4cd05d11bd3 ]

On Rx path, if we fail to build an skb from the incoming FD, we still need to update the channel buffer count accordingly, otherwise we risk depleting the pool while the software counter still sees available buffers.

---
 drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c |   15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

@@ -131,6 +131,8 @@ static struct sk_buff *build_linear_skb(
 	u16 fd_offset = dpaa2_fd_get_offset(fd);
 	u32 fd_length = dpaa2_fd_get_len(fd);
 
+	ch->buf_count--;
+
 	skb = build_skb(fd_vaddr, DPAA2_ETH_RX_BUF_SIZE +
 			SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
 	if (unlikely(!skb))

@@ -139,8 +141,6 @@ static struct sk_buff *build_linear_skb(
 	skb_reserve(skb, fd_offset);
 	skb_put(skb, fd_length);
 
-	ch->buf_count--;
-
 	return skb;
 }
 

@@ -178,8 +178,15 @@ static struct sk_buff *build_frag_skb(st
 			/* We build the skb around the first data buffer */
 			skb = build_skb(sg_vaddr, DPAA2_ETH_RX_BUF_SIZE +
 				SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
-			if (unlikely(!skb))
-				return NULL;
+			if (unlikely(!skb)) {
+				/* We still need to subtract the buffers used
+				 * by this FD from our software counter
+				 */
+				while (!dpaa2_sg_is_final(&sgt[i]) &&
+				       i < DPAA2_ETH_MAX_SG_ENTRIES)
+					i++;
+				break;
+			}
 
 			sg_offset = dpaa2_sg_get_offset(sge);
 			skb_reserve(skb, sg_offset);

Patches currently in stable-queue which might be from [email protected] are

queue-4.14/staging-fsl-dpaa2-eth-account-for-rx-fd-buffers-on-error-path.patch queue-4.14/staging-fsl-mc-dpio-fix-incorrect-comparison.patch