X-Git-Url: http://pilppa.org/gitweb/?a=blobdiff_plain;f=block%2Fgenhd.c;h=a9ec910974c1934675b887d2fc8c2d0703579b01;hb=f28ad2c3daf0691081d91488df4d9d101e1a2b5d;hp=d84a7df1e2a094e663f7e1683bb941f1c3562e2d;hpb=74a6d0f064cd9106599ce3f1d924309669e83582;p=linux-2.6-omap-h63xx.git

diff --git a/block/genhd.c b/block/genhd.c
index d84a7df1e2a..a9ec910974c 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -256,6 +256,22 @@ void blkdev_show(struct seq_file *seqf, off_t offset)
 }
 #endif /* CONFIG_PROC_FS */
 
+/**
+ * register_blkdev - register a new block device
+ *
+ * @major: the requested major device number [1..255]. If @major=0, try to
+ *         allocate any unused major number.
+ * @name: the name of the new block device as a zero terminated string
+ *
+ * The @name must be unique within the system.
+ *
+ * The return value depends on the @major input parameter.
+ *  - if a major device number was requested in range [1..255] then the
+ *    function returns zero on success, or a negative error code
+ *  - if any unused major number was requested with @major=0 parameter
+ *    then the return value is the allocated major number in range
+ *    [1..255] or a negative error code otherwise
+ */
 int register_blkdev(unsigned int major, const char *name)
 {
 	struct blk_major_name **n, *p;
@@ -1084,9 +1100,17 @@ dev_t blk_lookup_devt(const char *name, int partno)
 		struct gendisk *disk = dev_to_disk(dev);
 		struct hd_struct *part;
 
-		if (strcmp(dev->bus_id, name))
+		if (strcmp(dev_name(dev), name))
 			continue;
 
+		if (partno < disk->minors) {
+			/* We need to return the right devno, even
+			 * if the partition doesn't exist yet.
+			 */
+			devt = MKDEV(MAJOR(dev->devt),
+				     MINOR(dev->devt) + partno);
+			break;
+		}
 		part = disk_get_part(disk, partno);
 		if (part) {
 			devt = part_devt(part);