This is a note to let you know that I've just added the patch titled axonram: Fix gendisk handling to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: axonram-fix-gendisk-handling.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. >From foo@baz Tue Dec 12 13:38:50 CET 2017 From: Jan Kara <jack@xxxxxxx> Date: Wed, 8 Mar 2017 14:56:05 +0100 Subject: axonram: Fix gendisk handling From: Jan Kara <jack@xxxxxxx> [ Upstream commit 672a2c87c83649fb0167202342ce85af9a3b4f1c ] It is invalid to call del_gendisk() when disk->queue is NULL. Fix error handling in axon_ram_probe() to avoid doing that. Also del_gendisk() does not drop a reference to gendisk allocated by alloc_disk(). That has to be done by put_disk(). Add that call where needed. Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx> Signed-off-by: Jan Kara <jack@xxxxxxx> Signed-off-by: Jens Axboe <axboe@xxxxxx> Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- arch/powerpc/sysdev/axonram.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) --- a/arch/powerpc/sysdev/axonram.c +++ b/arch/powerpc/sysdev/axonram.c @@ -276,7 +276,9 @@ failed: if (bank->disk->major > 0) unregister_blkdev(bank->disk->major, bank->disk->disk_name); - del_gendisk(bank->disk); + if (bank->disk->flags & GENHD_FL_UP) + del_gendisk(bank->disk); + put_disk(bank->disk); } device->dev.platform_data = NULL; if (bank->io_addr != 0) @@ -301,6 +303,7 @@ axon_ram_remove(struct platform_device * device_remove_file(&device->dev, &dev_attr_ecc); free_irq(bank->irq_id, device); del_gendisk(bank->disk); + put_disk(bank->disk); iounmap((void __iomem *) bank->io_addr); kfree(bank); Patches currently in stable-queue which might be from jack@xxxxxxx are queue-4.4/axonram-fix-gendisk-handling.patch