[libraw1394 patch] Fix raw1394_channel_modify() on firewire-core

(juju)

Reported by Adrian Knoth:  fw_channel_modify() was unable to allocate
some channels which were actually free.
http://marc.info/?l=linux1394-devel&t=122818128900002

This can be easily fixed by replacing fw_channel_modify() by
ieee1394_channel_modify() because this is highlevel enough to work with
Juju as well.  We only may want a separate fw_channel_modify() in the
future when firewire-core gains a special ioctl() for that.

Also fix a documentation typo:  raw1394_channel_modify() did not show up
in extracted API documentation due to a cut'n'paste typo in raw1394.h.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Dan Dennedy <dan@dennedy.org>

src/dispatch.c

@@ -554,9 +554,6 @@ int raw1394_channel_modify (raw1394handle_t handle, unsigned int channel,
 		errno = EINVAL;
 		return -1;
 	}
-	if (handle->is_fw)
-		return fw_channel_modify(handle, channel, mode);
-	else
 	return ieee1394_channel_modify(handle, channel, mode);
 }
 

src/fw.c

@@ -1342,52 +1342,3 @@ fw_bandwidth_modify (raw1394handle_t handle,
   
         return 0;
 }
-
-int
-fw_channel_modify (raw1394handle_t handle,
-			unsigned int channel,
-			enum raw1394_modify_mode mode)
-{
-        quadlet_t buffer, compare, swap, bit;
-        nodeaddr_t addr;
-        int result;
-        
-	if (channel >= 64)
-		return -1;
-	addr = CSR_REGISTER_BASE +
-		CSR_CHANNELS_AVAILABLE_HI + 4 * (channel / 32);
-	/* Read currently available channels from IRM. */
-        result = raw1394_read(handle, raw1394_get_irm_id (handle), addr, 
-			      sizeof buffer, &buffer);
-        if (result < 0)
-                return -1;
-        
-	/* IEEE numbers bits from MSB (0) to LSB (31). */
-        bit = 1 << (31 - (channel & 31));
-        compare = ntohl(buffer);
-	switch (mode) {
-	case RAW1394_MODIFY_ALLOC:
-                if ((compare & bit) == 0)
-                        return -1;
-                swap = buffer & ~bit;
-		break;
-
-        case RAW1394_MODIFY_FREE:
-                if ((buffer & bit) != 0)
-                        return -1;
-                swap = buffer | bit;
-		break;
-
-	default:
-		return -1;
-        }
-  
-        result = raw1394_lock (handle, raw1394_get_irm_id (handle), addr,
-			       RAW1394_EXTCODE_COMPARE_SWAP,
-			       htonl(swap), htonl(compare), &buffer);
-
-        if (result < 0 || ntohl(buffer) != compare)
-                return -1;
-  
-        return 0;
-}

src/fw.h

@@ -214,9 +214,6 @@ int fw_get_config_rom(fw_handle_t handle, quadlet_t *buffer,
 int fw_bandwidth_modify (raw1394handle_t handle,
 		   unsigned int bandwidth,
 		   enum raw1394_modify_mode mode);
-int fw_channel_modify (raw1394handle_t handle,
-		   unsigned int channel,
-		   enum raw1394_modify_mode mode);
 
 int fw_iso_xmit_start(raw1394handle_t handle, int start_on_cycle,
 			   int prebuffer_packets);

src/raw1394.h

@@ -1203,7 +1203,7 @@ raw1394_bandwidth_modify (raw1394handle_t handle, unsigned int bandwidth,
 	enum raw1394_modify_mode mode);
 
 /**
- * raw1394_bandwidth_modify - allocate or release isochronous channel
+ * raw1394_channel_modify - allocate or release isochronous channel
  * @handle: a libraw1394 handle
  * @channel: isochronous channel
  * @mode: whether to allocate or free