commit 70e3bb504ccfe6ba725ab120bdb516d205d834f9
author Divy Le Ray <divy@chelsio.com> Tue Nov 17 16:38:28 2009 +0000
committer David S. Miller <davem@davemloft.net> Wed Nov 18 05:11:14 2009 -0800
tree 901ee7ceb689f00d9fc899b45e1eefb1a238dcfe
parent 4acc5a8eb42c3a5a7df570face5f03fb37fff349

cxgb3: fix premature page unmap

unmap Rx page only when guaranteed that this page won't be
used anymore to allocate rx page chunks.

Signed-off-by: Divy Le Ray <divy@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/cxgb3/sge.c

diff --git a/drivers/net/cxgb3/sge.c b/drivers/net/cxgb3/sge.c
index f866128..6366061 100644
--- a/drivers/net/cxgb3/sge.c
+++ b/drivers/net/cxgb3/sge.c
@@ -879,7 +879,7 @@
 	pci_dma_sync_single_for_cpu(adap->pdev, dma_addr, len,
 				    PCI_DMA_FROMDEVICE);
 	(*sd->pg_chunk.p_cnt)--;
-	if (!*sd->pg_chunk.p_cnt)
+	if (!*sd->pg_chunk.p_cnt && sd->pg_chunk.page != fl->pg_chunk.page)
 		pci_unmap_page(adap->pdev,
 			       sd->pg_chunk.mapping,
 			       fl->alloc_size,
@@ -2088,7 +2088,7 @@
 				    PCI_DMA_FROMDEVICE);
 
 	(*sd->pg_chunk.p_cnt)--;
-	if (!*sd->pg_chunk.p_cnt)
+	if (!*sd->pg_chunk.p_cnt && sd->pg_chunk.page != fl->pg_chunk.page)
 		pci_unmap_page(adap->pdev,
 			       sd->pg_chunk.mapping,
 			       fl->alloc_size,