Re: [PATCH 09/30] mtd_blkdevs: use blk_mq_alloc_disk

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On Tue, Jun 15, 2021 at 05:47:44PM +0200, Marek Szyprowski wrote:
> Hi,
> 
> On 02.06.2021 08:53, Christoph Hellwig wrote:
> > Use the blk_mq_alloc_disk API to simplify the gendisk and request_queue
> > allocation.
> >
> > Signed-off-by: Christoph Hellwig <hch@xxxxxx>
> 
> This patch landed in linux-next as commit 6966bb921def ("mtd_blkdevs: 
> use blk_mq_alloc_disk"). It causes the following regression on my QEMU 
> arm64 setup:

Please try the patch below:

diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c
index 5dc4c966ea73..6ce4bc57f919 100644
--- a/drivers/mtd/mtd_blkdevs.c
+++ b/drivers/mtd/mtd_blkdevs.c
@@ -382,6 +382,7 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new)
 	}
 
 	new->disk = gd;
+	new->rq = new->disk->queue;
 	gd->private_data = new;
 	gd->major = tr->major;
 	gd->first_minor = (new->devnum) << tr->part_bits;
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