linux-kernel - Re: [PATCH] nvme-pci : rectifying the nvme

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Date:   Thu, 9 Feb 2023 06:17:45 +0100
From:   Christoph Hellwig <hch@....de>
To:     Irvin Cote <irvin.cote@...a-lyon.fr>
Cc:     kbusch@...nel.org, axboe@...com, hch@....de, sagi@...mberg.me,
        kch@...dia.com, linux-nvme@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] nvme-pci : rectifying the nvme_probe teardown path

On Wed, Feb 08, 2023 at 04:38:54PM +0100, Irvin Cote wrote:
> >From ced363dcd3ef076e509bfbb4ce9815ebaff6aee7 Mon Sep 17 00:00:00 2001
> From: Irvin Cote <irvin.cote@...a-lyon.fr>
> Date: Wed, 8 Feb 2023 11:38:39 -0300
> Subject: [PATCH] nvme-pci : rectifying the nvme_probe teardown path
> The nvme_probe teardown path did not account for
> undoing the work of nvme_pci_alloc_dev, which is
> what nvme_pci_free_ctrl seemed to be intended for.
> Thus I displaced the call to nvme_uninit_ctrl
> from nvme_probe to nvme_pci_free_ctrl and added
> a call to the latter in the teardown path of nvme_probe.

Can you explain the problems you are seeing?

> index c734934c407c..db480bc64c7b 100644
> --- a/drivers/nvme/host/pci.c
> +++ b/drivers/nvme/host/pci.c
> @@ -2731,6 +2731,7 @@ static void nvme_pci_free_ctrl(struct nvme_ctrl *ctrl)
>  	struct nvme_dev *dev = to_nvme_dev(ctrl);
> 
>  	nvme_free_tagset(dev);
> +	nvme_uninit_ctrl(ctrl);

->free_ctrl is called for the final put of the ctrl, calling
nvme_uninit_ctrl here does not make sense.

> -out_uninit_ctrl:
> -	nvme_uninit_ctrl(&dev->ctrl);
> +out_unalloc_dev:
> +	nvme_pci_free_ctrl(&dev->ctrl);

Also calling nvme_pci_free_ctrl directly and not through the method
table is also wrong.