From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
To: netdev@vger.kernel.org
Cc: linux-renesas-soc@vger.kernel.org
Subject: [PATCH 2/2] sh_eth: advance 'rxdesc' later in sh_eth_ring_format()
Date: Tue, 08 Mar 2016 01:37:09 +0300 [thread overview]
Message-ID: <3282122.t8AnRHByyx@wasted.cogentembedded.com> (raw)
In-Reply-To: <4881302.XJJSmqvE1J@wasted.cogentembedded.com>
Iff dma_map_single() fails, 'rxdesc' should point to the last filled RX
descriptor, so that it can be marked as the last one, however the driver
would have already advanced it by that time. In order to fix that, only
fill an RX descriptor once all the data for it is ready.
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
---
drivers/net/ethernet/renesas/sh_eth.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
Index: net/drivers/net/ethernet/renesas/sh_eth.c
===================================================================
--- net.orig/drivers/net/ethernet/renesas/sh_eth.c
+++ net/drivers/net/ethernet/renesas/sh_eth.c
@@ -1136,11 +1136,8 @@ static void sh_eth_ring_format(struct ne
break;
sh_eth_set_receive_align(skb);
- /* RX descriptor */
- rxdesc = &mdp->rx_ring[i];
/* The size of the buffer is a multiple of 32 bytes. */
buf_len = ALIGN(mdp->rx_buf_sz, 32);
- rxdesc->len = cpu_to_le32(buf_len << 16);
dma_addr = dma_map_single(&ndev->dev, skb->data, buf_len,
DMA_FROM_DEVICE);
if (dma_mapping_error(&ndev->dev, dma_addr)) {
@@ -1148,6 +1145,10 @@ static void sh_eth_ring_format(struct ne
break;
}
mdp->rx_skbuff[i] = skb;
+
+ /* RX descriptor */
+ rxdesc = &mdp->rx_ring[i];
+ rxdesc->len = cpu_to_le32(buf_len << 16);
rxdesc->addr = cpu_to_le32(dma_addr);
rxdesc->status = cpu_to_le32(RD_RACT | RD_RFP);
next prev parent reply other threads:[~2016-03-07 22:37 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-07 22:33 [PATCH 0/2] sh_eth: fix couple of bugs in sh_eth_ring_format() Sergei Shtylyov
2016-03-07 22:36 ` [PATCH 1/2] sh_eth: fix NULL pointer dereference " Sergei Shtylyov
2016-03-07 22:37 ` Sergei Shtylyov [this message]
2016-03-10 21:07 ` [PATCH 0/2] sh_eth: fix couple of bugs " David Miller
2016-03-10 22:01 ` Sergei Shtylyov
2016-03-10 22:37 ` David Miller
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