[kernel/f19] Resolves bz 1082266

[Neil Horman]

commit 1e14a4f4f802f8fba229ba3c6d7d73c9a9c7c161
Author: Neil Horman <nhorman at tuxdriver.com>
Date:   Thu May 8 12:40:44 2014 -0400

    Resolves bz 1082266

 jme-fix-dma-unmap-error.patch |  124 +++++++++++++++++++++++++++++++++++++++++
 kernel.spec                   |    8 +++
 2 files changed, 132 insertions(+), 0 deletions(-)
---
diff --git a/jme-fix-dma-unmap-error.patch b/jme-fix-dma-unmap-error.patch
new file mode 100644
index 0000000..2084472
--- /dev/null
+++ b/jme-fix-dma-unmap-error.patch
@@ -0,0 +1,124 @@
+diff -up ./drivers/net/ethernet/jme.c.orig ./drivers/net/ethernet/jme.c
+--- ./drivers/net/ethernet/jme.c.orig	2014-03-30 23:40:15.000000000 -0400
++++ ./drivers/net/ethernet/jme.c	2014-05-08 12:16:52.701746091 -0400
+@@ -1988,7 +1988,7 @@ jme_alloc_txdesc(struct jme_adapter *jme
+ 	return idx;
+ }
+ 
+-static void
++static int
+ jme_fill_tx_map(struct pci_dev *pdev,
+ 		struct txdesc *txdesc,
+ 		struct jme_buffer_info *txbi,
+@@ -2005,6 +2005,9 @@ jme_fill_tx_map(struct pci_dev *pdev,
+ 				len,
+ 				PCI_DMA_TODEVICE);
+ 
++	if (unlikely(pci_dma_mapping_error(pdev, dmaaddr)))
++		return -EINVAL;
++
+ 	pci_dma_sync_single_for_device(pdev,
+ 				       dmaaddr,
+ 				       len,
+@@ -2021,9 +2024,30 @@ jme_fill_tx_map(struct pci_dev *pdev,
+ 
+ 	txbi->mapping = dmaaddr;
+ 	txbi->len = len;
++	return 0;
+ }
+ 
+-static void
++static void jme_drop_tx_map(struct jme_adapter *jme, int startidx, int endidx)
++{
++	struct jme_ring *txring = &(jme->txring[0]);
++	struct jme_buffer_info *txbi = txring->bufinf, *ctxbi;
++	int mask = jme->tx_ring_mask;
++	int j;
++
++	for (j = startidx ; j < endidx ; ++j) {
++		ctxbi = txbi + ((startidx + j + 2) & (mask));
++		pci_unmap_page(jme->pdev,
++				ctxbi->mapping,
++				ctxbi->len,
++				PCI_DMA_TODEVICE);
++
++				ctxbi->mapping = 0;
++				ctxbi->len = 0;
++	}
++
++}
++
++static int
+ jme_map_tx_skb(struct jme_adapter *jme, struct sk_buff *skb, int idx)
+ {
+ 	struct jme_ring *txring = &(jme->txring[0]);
+@@ -2034,25 +2058,37 @@ jme_map_tx_skb(struct jme_adapter *jme,
+ 	int mask = jme->tx_ring_mask;
+ 	const struct skb_frag_struct *frag;
+ 	u32 len;
++	int ret = 0;
+ 
+ 	for (i = 0 ; i < nr_frags ; ++i) {
+ 		frag = &skb_shinfo(skb)->frags[i];
+ 		ctxdesc = txdesc + ((idx + i + 2) & (mask));
+ 		ctxbi = txbi + ((idx + i + 2) & (mask));
+ 
+-		jme_fill_tx_map(jme->pdev, ctxdesc, ctxbi,
++		ret = jme_fill_tx_map(jme->pdev, ctxdesc, ctxbi,
+ 				skb_frag_page(frag),
+ 				frag->page_offset, skb_frag_size(frag), hidma);
++		if (ret) {
++			jme_drop_tx_map(jme, idx, idx+i);
++			goto out;
++		}
++
+ 	}
+ 
+ 	len = skb_is_nonlinear(skb) ? skb_headlen(skb) : skb->len;
+ 	ctxdesc = txdesc + ((idx + 1) & (mask));
+ 	ctxbi = txbi + ((idx + 1) & (mask));
+-	jme_fill_tx_map(jme->pdev, ctxdesc, ctxbi, virt_to_page(skb->data),
++	ret = jme_fill_tx_map(jme->pdev, ctxdesc, ctxbi, virt_to_page(skb->data),
+ 			offset_in_page(skb->data), len, hidma);
++	if (ret)
++		jme_drop_tx_map(jme, idx, idx+i);
++
++out:
++	return ret;
+ 
+ }
+ 
++
+ static int
+ jme_expand_header(struct jme_adapter *jme, struct sk_buff *skb)
+ {
+@@ -2144,6 +2180,7 @@ jme_fill_tx_desc(struct jme_adapter *jme
+ 	struct txdesc *txdesc;
+ 	struct jme_buffer_info *txbi;
+ 	u8 flags;
++	int ret = 0;
+ 
+ 	txdesc = (struct txdesc *)txring->desc + idx;
+ 	txbi = txring->bufinf + idx;
+@@ -2168,7 +2205,10 @@ jme_fill_tx_desc(struct jme_adapter *jme
+ 	if (jme_tx_tso(skb, &txdesc->desc1.mss, &flags))
+ 		jme_tx_csum(jme, skb, &flags);
+ 	jme_tx_vlan(skb, &txdesc->desc1.vlan, &flags);
+-	jme_map_tx_skb(jme, skb, idx);
++	ret = jme_map_tx_skb(jme, skb, idx);
++	if (ret)
++		return ret;
++
+ 	txdesc->desc1.flags = flags;
+ 	/*
+ 	 * Set tx buffer info after telling NIC to send
+@@ -2240,7 +2280,8 @@ jme_start_xmit(struct sk_buff *skb, stru
+ 		return NETDEV_TX_BUSY;
+ 	}
+ 
+-	jme_fill_tx_desc(jme, skb, idx);
++	if (jme_fill_tx_desc(jme, skb, idx))
++		return NETDEV_TX_BUSY;
+ 
+ 	jwrite32(jme, JME_TXCS, jme->reg_txcs |
+ 				TXCS_SELECT_QUEUE0 |
diff --git a/kernel.spec b/kernel.spec
index 8050f9c..9fab223 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -793,6 +793,9 @@ Patch25084: 3-5-net-Add-variants-of-capable-for-use-on-on-sockets.patch
 Patch25085: 4-5-net-Add-variants-of-capable-for-use-on-netlink-messages.patch
 Patch25086: 5-5-net-Use-netlink_ns_capable-to-verify-the-permisions-of-netlink-messages.patch
 
+#rhbz 1082266
+Patch25087: jme-fix-dma-unmap-error.patch
+
 # END OF PATCH DEFINITIONS
 
 %endif
@@ -1529,6 +1532,8 @@ ApplyPatch 3-5-net-Add-variants-of-capable-for-use-on-on-sockets.patch
 ApplyPatch 4-5-net-Add-variants-of-capable-for-use-on-netlink-messages.patch
 ApplyPatch 5-5-net-Use-netlink_ns_capable-to-verify-the-permisions-of-netlink-messages.patch
 
+#rhbz 1082266
+ApplyPatch jme-fix-dma-unmap-error.patch
 
 # END OF PATCH APPLICATIONS
 
@@ -2342,6 +2347,9 @@ fi
 # and build.
 
 %changelog
+* Thu May 08 2014 Neil Horman <nhorman at redhat.com> - 3.14.3-101
+- Fix dma unmap error in jme driver (rhbz 1082266)
+
 * Thu May 08 2014 Justin M. Forbes <jforbes at fedoraproject.org> - 3.14.3-100
 - Linux v3.14.3