[PATCH] b44: alternate allocation option for DMA descriptors

This is a (final?) hack to support the odd DMA allocation requirements
of the b44 hardware.  The b44 hardware has a 30-bit DMA mask.  On x86,
anything less than a 32-bit DMA mask forces allocations into the 16MB
GFP_DMA range.  The memory there is somewhat limited, often resulting
in an inability to initialize the b44 driver.

This hack uses streaming DMA allocation APIs in order to provide an
alternative in case the GFP_DMA allocation fails.  It is somewhat ugly,
but not much worse than the similar existing hacks to support SKB
allocations in the same driver.  FWIW, I have received positive
feedback on this from several Fedora users.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/net/b44.h b/drivers/net/b44.h
index 11c40a2e71c..593cb0ad410 100644
--- a/drivers/net/b44.h
+++ b/drivers/net/b44.h
@@ -400,6 +400,8 @@ struct b44 {
 #define B44_FLAG_ADV_100HALF    0x04000000
 #define B44_FLAG_ADV_100FULL    0x08000000
 #define B44_FLAG_INTERNAL_PHY   0x10000000
+#define B44_FLAG_RX_RING_HACK   0x20000000
+#define B44_FLAG_TX_RING_HACK   0x40000000
 
         u32                     rx_offset;