[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>

diff --git a/drivers/ieee1394/eth1394.c b/drivers/ieee1394/eth1394.c
index cd53c17..4802bbb 100644 (file)
--- a/drivers/ieee1394/eth1394.c
+++ b/drivers/ieee1394/eth1394.c
@@ -89,7 +89,7 @@
 #define TRACE() printk(KERN_ERR "%s:%s[%d] ---- TRACE\n", driver_name, __FUNCTION__, __LINE__)
 
 static char version[] __devinitdata =
-       "$Rev: 1264 $ Ben Collins <bcollins@debian.org>";
+       "$Rev: 1312 $ Ben Collins <bcollins@debian.org>";
 
 struct fragment_info {
        struct list_head list;
@@ -221,9 +221,7 @@ static int ether1394_open (struct net_device *dev)
        if (priv->bc_state == ETHER1394_BC_ERROR) {
                /* we'll try again */
                priv->iso = hpsb_iso_recv_init(priv->host,
-                                              ETHER1394_GASP_BUFFERS * 2 *
-                                              (1 << (priv->host->csr.max_rec +
-                                                     1)),
+                                              ETHER1394_ISO_BUF_SIZE,
                                               ETHER1394_GASP_BUFFERS,
                                               priv->broadcast_channel,
                                               HPSB_ISO_DMA_PACKET_PER_BUFFER,
@@ -635,8 +633,8 @@ static void ether1394_add_host (struct hpsb_host *host)
         * be checked when the eth device is opened. */
        priv->broadcast_channel = host->csr.broadcast_channel & 0x3f;
 
-       priv->iso = hpsb_iso_recv_init(host, (ETHER1394_GASP_BUFFERS * 2 *
-                                             (1 << (host->csr.max_rec + 1))),
+       priv->iso = hpsb_iso_recv_init(host,
+                                      ETHER1394_ISO_BUF_SIZE,
                                       ETHER1394_GASP_BUFFERS,
                                       priv->broadcast_channel,
                                       HPSB_ISO_DMA_PACKET_PER_BUFFER,
@@ -1770,7 +1768,7 @@ fail:
 static void ether1394_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info)
 {
        strcpy (info->driver, driver_name);
-       strcpy (info->version, "$Rev: 1264 $");
+       strcpy (info->version, "$Rev: 1312 $");
        /* FIXME XXX provide sane businfo */
        strcpy (info->bus_info, "ieee1394");
 }

diff --git a/drivers/ieee1394/eth1394.h b/drivers/ieee1394/eth1394.h
index ed8f1c4..a77213c 100644 (file)
--- 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)