diff --git a/Documentation/i2c/chips/max6875 b/Documentation/i2c/chips/max6875
index 96fec56..a0cd8af 100644
--- a/Documentation/i2c/chips/max6875
+++ b/Documentation/i2c/chips/max6875
@@ -99,7 +99,7 @@
 
   or
 
-  count = i2c_smbus_read_i2c_block_data(fd, 0x84, buffer);
+  count = i2c_smbus_read_i2c_block_data(fd, 0x84, 16, buffer);
 
 The block read should read 16 bytes.
 0x84 is the block read command.
diff --git a/Documentation/i2c/writing-clients b/Documentation/i2c/writing-clients
index 3d8d36b..2c17003 100644
--- a/Documentation/i2c/writing-clients
+++ b/Documentation/i2c/writing-clients
@@ -571,7 +571,7 @@
                                         u8 command, u8 length,
                                         u8 *values);
   extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
-                                           u8 command, u8 *values);
+                                           u8 command, u8 length, u8 *values);
 
 These ones were removed in Linux 2.6.10 because they had no users, but could
 be added back later if needed:
diff --git a/drivers/i2c/busses/i2c-powermac.c b/drivers/i2c/busses/i2c-powermac.c
index 1425d224..0ab4f26 100644
--- a/drivers/i2c/busses/i2c-powermac.c
+++ b/drivers/i2c/busses/i2c-powermac.c
@@ -121,8 +121,7 @@
 		if (rc)
 			goto bail;
 		rc = pmac_i2c_xfer(bus, addrdir, 1, command,
-				   read ? data->block : &data->block[1],
-				   data->block[0]);
+				   &data->block[1], data->block[0]);
 		break;
 
         default:
diff --git a/drivers/i2c/busses/i2c-viapro.c b/drivers/i2c/busses/i2c-viapro.c
index 7a2bc06..a0f7e4a 100644
--- a/drivers/i2c/busses/i2c-viapro.c
+++ b/drivers/i2c/busses/i2c-viapro.c
@@ -235,7 +235,7 @@
 		if (!(vt596_features & FEATURE_I2CBLOCK))
 			goto exit_unsupported;
 		if (read_write == I2C_SMBUS_READ)
-			outb_p(I2C_SMBUS_BLOCK_MAX, SMBHSTDAT0);
+			outb_p(data->block[0], SMBHSTDAT0);
 		/* Fall through */
 	case I2C_SMBUS_BLOCK_DATA:
 		outb_p(command, SMBHSTCMD);
diff --git a/drivers/i2c/busses/scx200_acb.c b/drivers/i2c/busses/scx200_acb.c
index dc64f8b..e6c4a2b 100644
--- a/drivers/i2c/busses/scx200_acb.c
+++ b/drivers/i2c/busses/scx200_acb.c
@@ -310,8 +310,6 @@
 		break;
 
 	case I2C_SMBUS_I2C_BLOCK_DATA:
-		if (rw == I2C_SMBUS_READ)
-			data->block[0] = I2C_SMBUS_BLOCK_MAX; /* For now */
 		len = data->block[0];
 		if (len == 0 || len > I2C_SMBUS_BLOCK_MAX)
 			return -EINVAL;
diff --git a/drivers/i2c/chips/eeprom.c b/drivers/i2c/chips/eeprom.c
index bfce13c..48f857a 100644
--- a/drivers/i2c/chips/eeprom.c
+++ b/drivers/i2c/chips/eeprom.c
@@ -88,8 +88,10 @@
 		dev_dbg(&client->dev, "Starting eeprom update, slice %u\n", slice);
 
 		if (i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
-			for (i = slice << 5; i < (slice + 1) << 5; i += I2C_SMBUS_BLOCK_MAX)
-				if (i2c_smbus_read_i2c_block_data(client, i, data->data + i) != I2C_SMBUS_BLOCK_MAX)
+			for (i = slice << 5; i < (slice + 1) << 5; i += 32)
+				if (i2c_smbus_read_i2c_block_data(client, i,
+							32, data->data + i)
+							!= 32)
 					goto exit;
 		} else {
 			if (i2c_smbus_write_byte(client, slice << 5)) {
diff --git a/drivers/i2c/chips/max6875.c b/drivers/i2c/chips/max6875.c
index 76645c1..e9e9e51 100644
--- a/drivers/i2c/chips/max6875.c
+++ b/drivers/i2c/chips/max6875.c
@@ -106,6 +106,7 @@
 					    I2C_FUNC_SMBUS_READ_I2C_BLOCK)) {
 			if (i2c_smbus_read_i2c_block_data(client,
 							  MAX6875_CMD_BLK_READ,
+							  SLICE_SIZE,
 							  buf) != SLICE_SIZE) {
 				goto exit_up;
 			}
diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
index cccfa86..6971a62 100644
--- a/drivers/i2c/i2c-core.c
+++ b/drivers/i2c/i2c-core.c
@@ -1344,10 +1344,14 @@
 EXPORT_SYMBOL(i2c_smbus_write_block_data);
 
 /* Returns the number of read bytes */
-s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command, u8 *values)
+s32 i2c_smbus_read_i2c_block_data(struct i2c_client *client, u8 command,
+				  u8 length, u8 *values)
 {
 	union i2c_smbus_data data;
 
+	if (length > I2C_SMBUS_BLOCK_MAX)
+		length = I2C_SMBUS_BLOCK_MAX;
+	data.block[0] = length;
 	if (i2c_smbus_xfer(client->adapter,client->addr,client->flags,
 	                      I2C_SMBUS_READ,command,
 	                      I2C_SMBUS_I2C_BLOCK_DATA,&data))
@@ -1468,7 +1472,7 @@
 		break;
 	case I2C_SMBUS_I2C_BLOCK_DATA:
 		if (read_write == I2C_SMBUS_READ) {
-			msg[1].len = I2C_SMBUS_BLOCK_MAX;
+			msg[1].len = data->block[0];
 		} else {
 			msg[0].len = data->block[0] + 1;
 			if (msg[0].len > I2C_SMBUS_BLOCK_MAX + 1) {
@@ -1524,9 +1528,7 @@
 				data->word = msgbuf1[0] | (msgbuf1[1] << 8);
 				break;
 			case I2C_SMBUS_I2C_BLOCK_DATA:
-				/* fixed at 32 for now */
-				data->block[0] = I2C_SMBUS_BLOCK_MAX;
-				for (i = 0; i < I2C_SMBUS_BLOCK_MAX; i++)
+				for (i = 0; i < data->block[0]; i++)
 					data->block[i+1] = msgbuf1[i];
 				break;
 			case I2C_SMBUS_BLOCK_DATA:
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c
index e7a7097..64eee95 100644
--- a/drivers/i2c/i2c-dev.c
+++ b/drivers/i2c/i2c-dev.c
@@ -283,6 +283,7 @@
 		    (data_arg.size != I2C_SMBUS_WORD_DATA) &&
 		    (data_arg.size != I2C_SMBUS_PROC_CALL) &&
 		    (data_arg.size != I2C_SMBUS_BLOCK_DATA) &&
+		    (data_arg.size != I2C_SMBUS_I2C_BLOCK_BROKEN) &&
 		    (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) &&
 		    (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) {
 			dev_dbg(&client->adapter->dev,
@@ -329,10 +330,18 @@
 
 		if ((data_arg.size == I2C_SMBUS_PROC_CALL) ||
 		    (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) ||
+		    (data_arg.size == I2C_SMBUS_I2C_BLOCK_DATA) ||
 		    (data_arg.read_write == I2C_SMBUS_WRITE)) {
 			if (copy_from_user(&temp, data_arg.data, datasize))
 				return -EFAULT;
 		}
+		if (data_arg.size == I2C_SMBUS_I2C_BLOCK_BROKEN) {
+			/* Convert old I2C block commands to the new
+			   convention. This preserves binary compatibility. */
+			data_arg.size = I2C_SMBUS_I2C_BLOCK_DATA;
+			if (data_arg.read_write == I2C_SMBUS_READ)
+				temp.block[0] = I2C_SMBUS_BLOCK_MAX;
+		}
 		res = i2c_smbus_xfer(client->adapter,client->addr,client->flags,
 		      data_arg.read_write,
 		      data_arg.command,data_arg.size,&temp);
diff --git a/drivers/macintosh/windfarm_smu_sat.c b/drivers/macintosh/windfarm_smu_sat.c
index 1043b39..351982b 100644
--- a/drivers/macintosh/windfarm_smu_sat.c
+++ b/drivers/macintosh/windfarm_smu_sat.c
@@ -67,26 +67,6 @@
 	.detach_client	= wf_sat_detach,
 };
 
-/*
- * XXX i2c_smbus_read_i2c_block_data doesn't pass the requested
- * length down to the low-level driver, so we use this, which
- * works well enough with the SMU i2c driver code...
- */
-static int sat_read_block(struct i2c_client *client, u8 command,
-			  u8 *values, int len)
-{
-	union i2c_smbus_data data;
-	int err;
-
-	data.block[0] = len;
-	err = i2c_smbus_xfer(client->adapter, client->addr, client->flags,
-			     I2C_SMBUS_READ, command, I2C_SMBUS_I2C_BLOCK_DATA,
-			     &data);
-	if (!err)
-		memcpy(values, data.block, len);
-	return err;
-}
-
 struct smu_sdbp_header *smu_sat_get_sdb_partition(unsigned int sat_id, int id,
 						  unsigned int *size)
 {
@@ -124,8 +104,8 @@
 		return NULL;
 
 	for (i = 0; i < len; i += 4) {
-		err = sat_read_block(&sat->i2c, 0xa, data, 4);
-		if (err) {
+		err = i2c_smbus_read_i2c_block_data(&sat->i2c, 0xa, 4, data);
+		if (err < 0) {
 			printk(KERN_ERR "smu_sat_get_sdb_part rd err %d\n",
 			       err);
 			goto fail;
@@ -157,8 +137,8 @@
 {
 	int err;
 
-	err = sat_read_block(&sat->i2c, 0x3f, sat->cache, 16);
-	if (err)
+	err = i2c_smbus_read_i2c_block_data(&sat->i2c, 0x3f, 16, sat->cache);
+	if (err < 0)
 		return err;
 	sat->last_read = jiffies;
 #ifdef LOTSA_DEBUG
diff --git a/include/linux/i2c.h b/include/linux/i2c.h
index 44f2ecf..2eaba21 100644
--- a/include/linux/i2c.h
+++ b/include/linux/i2c.h
@@ -90,7 +90,7 @@
 				      const u8 *values);
 /* Returns the number of read bytes */
 extern s32 i2c_smbus_read_i2c_block_data(struct i2c_client * client,
-					 u8 command, u8 *values);
+					 u8 command, u8 length, u8 *values);
 extern s32 i2c_smbus_write_i2c_block_data(struct i2c_client * client,
 					  u8 command, u8 length,
 					  const u8 *values);
@@ -524,8 +524,9 @@
 #define I2C_SMBUS_WORD_DATA	    3
 #define I2C_SMBUS_PROC_CALL	    4
 #define I2C_SMBUS_BLOCK_DATA	    5
-#define I2C_SMBUS_I2C_BLOCK_DATA    6
+#define I2C_SMBUS_I2C_BLOCK_BROKEN  6
 #define I2C_SMBUS_BLOCK_PROC_CALL   7		/* SMBus 2.0 */
+#define I2C_SMBUS_I2C_BLOCK_DATA    8
 
 
 /* ----- commands for the ioctl like i2c_command call: