[PATCH] I2O: handle __copy_from_user

Handle __copy_from_user() return value.

Noticed by inspection, not from build warning.
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Cc: Markus Lidel <Markus.Lidel@shadowconnect.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

drivers/message/i2o/i2o_config.c

@@ -265,7 +265,11 @@ static int i2o_cfg_swdl(unsigned long arg)
 		return -ENOMEM;
 	}
 
-	__copy_from_user(buffer.virt, kxfer.buf, fragsize);
+	if (__copy_from_user(buffer.virt, kxfer.buf, fragsize)) {
+		i2o_msg_nop(c, msg);
+		i2o_dma_free(&c->pdev->dev, &buffer);
+		return -EFAULT;
+	}
 
 	msg->u.head[0] = cpu_to_le32(NINE_WORD_MSG_SIZE | SGL_OFFSET_7);
 	msg->u.head[1] =