[PATCH] eth1394: workaround limitation in rawiso routines

Work around limitation in rawiso routines.  Required with 1394b cards on
architectures where PAGE_SIZE is 4096.  Based on a previous patch by Ben
Collins.

Signed-off-by: Jody McIntyre <scjody@steamballoon.com>
Cc: Ben Collins <bcollins@debian.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/ieee1394/eth1394.h b/drivers/ieee1394/eth1394.h
index ed8f1c4b7fd8..a77213cfc483 100644
--- a/drivers/ieee1394/eth1394.h
+++ b/drivers/ieee1394/eth1394.h
@@ -44,6 +44,12 @@
 
 #define ETHER1394_GASP_BUFFERS 16
 
+/* rawiso buffer size - due to a limitation in rawiso, we must limit each
+ * GASP buffer to be less than PAGE_SIZE. */
+#define ETHER1394_ISO_BUF_SIZE  ETHER1394_GASP_BUFFERS *                        \
+                                   min((unsigned int)PAGE_SIZE,                 \
+                                       2 * (1U << (priv->host->csr.max_rec + 1)))
+
 /* Node set == 64 */
 #define NODE_SET                        (ALL_NODES + 1)