2.6.35-longterm review patch.  If anyone has any objections, please let me know.

------------------
From: Namhyung Kim <namhy...@gmail.com>

commit af46566885a373b0a526932484cd8fef8de7b598 upstream.

When finding or allocating a ram disk device, brd_probe() did not take
partition numbers into account so that it can result to a different
device. Consider following example (I set CONFIG_BLK_DEV_RAM_COUNT=4
for simplicity) :

$ sudo modprobe brd max_part=15
$ ls -l /dev/ram*
brw-rw---- 1 root disk 1,  0 2011-05-25 15:41 /dev/ram0
brw-rw---- 1 root disk 1, 16 2011-05-25 15:41 /dev/ram1
brw-rw---- 1 root disk 1, 32 2011-05-25 15:41 /dev/ram2
brw-rw---- 1 root disk 1, 48 2011-05-25 15:41 /dev/ram3
$ sudo mknod /dev/ram4 b 1 64
$ sudo dd if=/dev/zero of=/dev/ram4 bs=4k count=256
256+0 records in
256+0 records out
1048576 bytes (1.0 MB) copied, 0.00215578 s, 486 MB/s
namhyung@leonhard:linux$ ls -l /dev/ram*
brw-rw---- 1 root disk 1,    0 2011-05-25 15:41 /dev/ram0
brw-rw---- 1 root disk 1,   16 2011-05-25 15:41 /dev/ram1
brw-rw---- 1 root disk 1,   32 2011-05-25 15:41 /dev/ram2
brw-rw---- 1 root disk 1,   48 2011-05-25 15:41 /dev/ram3
brw-r--r-- 1 root root 1,   64 2011-05-25 15:45 /dev/ram4
brw-rw---- 1 root disk 1, 1024 2011-05-25 15:44 /dev/ram64

After this patch, /dev/ram4 - instead of /dev/ram64 - was
accessed correctly.

In addition, 'range' passed to blk_register_region() should
include all range of dev_t that RAMDISK_MAJOR can address.
It does not need to be limited by partition numbers unless
'rd_nr' param was specified.

Signed-off-by: Namhyung Kim <namhy...@gmail.com>
Cc: Laurent Vivier <laurent.viv...@bull.net>
Signed-off-by: Jens Axboe <jax...@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gre...@suse.de>
Signed-off-by: Andi Kleen <a...@linux.intel.com>

---
 drivers/block/brd.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

Index: linux-2.6.35.y/drivers/block/brd.c
===================================================================
--- linux-2.6.35.y.orig/drivers/block/brd.c
+++ linux-2.6.35.y/drivers/block/brd.c
@@ -549,7 +549,7 @@ static struct kobject *brd_probe(dev_t d
        struct kobject *kobj;
 
        mutex_lock(&brd_devices_mutex);
-       brd = brd_init_one(dev & MINORMASK);
+       brd = brd_init_one(MINOR(dev) >> part_shift);
        kobj = brd ? get_disk(brd->brd_disk) : ERR_PTR(-ENOMEM);
        mutex_unlock(&brd_devices_mutex);
 
@@ -590,10 +590,10 @@ static int __init brd_init(void)
 
        if (rd_nr) {
                nr = rd_nr;
-               range = rd_nr;
+               range = rd_nr << part_shift;
        } else {
                nr = CONFIG_BLK_DEV_RAM_COUNT;
-               range = 1UL << (MINORBITS - part_shift);
+               range = 1UL << MINORBITS;
        }
 
        if (register_blkdev(RAMDISK_MAJOR, "ramdisk"))
@@ -632,7 +632,7 @@ static void __exit brd_exit(void)
        unsigned long range;
        struct brd_device *brd, *next;
 
-       range = rd_nr ? rd_nr :  1UL << (MINORBITS - part_shift);
+       range = rd_nr ? rd_nr << part_shift : 1UL << MINORBITS;
 
        list_for_each_entry_safe(brd, next, &brd_devices, brd_list)
                brd_del_one(brd);

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