[Armadeus-commitlog] armadeus branch, master, updated. armadeus-5.2-347-g7e97d2c

[Fabien M <fa...@us...>]

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- Log -----------------------------------------------------------------
commit 7e97d2c53099150b57f92e3eafd68e9bb2f211bf
Author: Fabien Marteau <fab...@ar...>
Date:   Thu Aug 1 12:06:49 2013 +0200

    [linux] microSD bug correction (patch 2.6.39-stable backport)

-----------------------------------------------------------------------

Summary of changes:
 ...kdev_get-should-access-bd_disk-only-after.patch |   40 ++++++++++++++++++++
 1 files changed, 40 insertions(+), 0 deletions(-)
 create mode 100644 patches/linux/2.6.38/452-BACKPORT_2_6_39-block-blkdev_get-should-access-bd_disk-only-after.patch

diff --git a/patches/linux/2.6.38/452-BACKPORT_2_6_39-block-blkdev_get-should-access-bd_disk-only-after.patch b/patches/linux/2.6.38/452-BACKPORT_2_6_39-block-blkdev_get-should-access-bd_disk-only-after.patch
new file mode 100644
index 0000000..956b041
--- /dev/null
+++ b/patches/linux/2.6.38/452-BACKPORT_2_6_39-block-blkdev_get-should-access-bd_disk-only-after.patch
@@ -0,0 +1,40 @@
+From 4c49ff3fe128ca68dabd07537415c419ad7f82f9 Mon Sep 17 00:00:00 2001
+From: Tejun Heo <tj...@ke...>
+Date: Wed, 1 Jun 2011 08:27:41 +0200
+Subject: block: blkdev_get() should access ->bd_disk only after
+ success
+
+From: Tejun Heo <tj...@ke...>
+
+commit 4c49ff3fe128ca68dabd07537415c419ad7f82f9 upstream.
+
+d4dc210f69 (block: don't block events on excl write for non-optical
+devices) added dereferencing of bdev->bd_disk to test
+GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE; however, bdev->bd_disk can be
+%NULL if open failed which can lead to an oops.
+
+Test the flag after testing open was successful, not before.
+
+Signed-off-by: Tejun Heo <tj...@ke...>
+Reported-by: David Miller <da...@da...>
+Tested-by: David Miller <da...@da...>
+Signed-off-by: Jens Axboe <ja...@fu...>
+Signed-off-by: Greg Kroah-Hartman <gr...@su...>
+
+---
+ fs/block_dev.c |    4 ++--
+ 1 file changed, 2 insertions(+), 2 deletions(-)
+
+--- a/fs/block_dev.c
++++ b/fs/block_dev.c
+@@ -1272,8 +1272,8 @@ int blkdev_get(struct block_device *bdev
+ 		 * individual writeable reference is too fragile given the
+ 		 * way @mode is used in blkdev_get/put().
+ 		 */
+-		if ((disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE) &&
+-		    !res && (mode & FMODE_WRITE) && !bdev->bd_write_holder) {
++		if (!res && (mode & FMODE_WRITE) && !bdev->bd_write_holder &&
++		    (disk->flags & GENHD_FL_BLOCK_EVENTS_ON_EXCL_WRITE)) {
+ 			bdev->bd_write_holder = true;
+ 			disk_block_events(disk);
+ 		}


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