Re: Patch "mtd: nand: gpmi: Fix gpmi_nand_init() error path" has been added to the 4.4-stable tree

[Amit Pundir <amit.pundir@linaro.org>]

On 10 April 2018 at 14:34,  <gregkh@linuxfoundation.org> wrote:
>
> This is a note to let you know that I've just added the patch titled
>
>     mtd: nand: gpmi: Fix gpmi_nand_init() error path
>
> 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:
>      mtd-nand-gpmi-fix-gpmi_nand_init-error-path.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@vger.kernel.org> know about it.
>

This patch broke ARM builds at kernelci
https://kernelci.org/build/stable-rc/branch/linux-4.4.y/kernel/v4.4.127-170-g7914585b83e0/

It depends on nand_cleanup() introduced in d44154f969a4 ("mtd: nand:
Provide nand_cleanup() function to free NAND related resources")

Regards,
Amit Pundir

>
> From foo@baz Tue Apr 10 10:31:53 CEST 2018
> From: Boris Brezillon <boris.brezillon@free-electrons.com>
> Date: Mon, 10 Apr 2017 10:35:17 +0200
> Subject: mtd: nand: gpmi: Fix gpmi_nand_init() error path
>
> From: Boris Brezillon <boris.brezillon@free-electrons.com>
>
>
> [ Upstream commit 4d02423e9afe6c46142ce98bbcaf5167316dbfbf ]
>
> The GPMI driver is wrongly assuming that nand_release() can safely be
> called on an uninitialized/unregistered NAND device.
>
> Add a new err_nand_cleanup label in the error path and only execute if
> nand_scan_tail() succeeded.
>
> Note that we now call nand_cleanup() instead of nand_release()
> (nand_release() is actually grouping the mtd_device_unregister() and
> nand_cleanup() in one call) because there's no point in trying to
> unregister a device that has never been registered.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
> Acked-by: Han Xu <han.xu@nxp.com>
> Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> ---
>  drivers/mtd/nand/gpmi-nand/gpmi-nand.c |   10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
>
> --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> @@ -1949,19 +1949,21 @@ static int gpmi_nand_init(struct gpmi_na
>
>         ret = nand_boot_init(this);
>         if (ret)
> -               goto err_out;
> +               goto err_nand_cleanup;
>         ret = chip->scan_bbt(mtd);
>         if (ret)
> -               goto err_out;
> +               goto err_nand_cleanup;
>
>         ppdata.of_node = this->pdev->dev.of_node;
>         ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
>         if (ret)
> -               goto err_out;
> +               goto err_nand_cleanup;
>         return 0;
>
> +err_nand_cleanup:
> +       nand_cleanup(chip);
>  err_out:
> -       gpmi_nand_exit(this);
> +       gpmi_free_dma_buffer(this);
>         return ret;
>  }
>
>
>
> Patches currently in stable-queue which might be from boris.brezillon@free-electrons.com are
>
> queue-4.4/mtd-nand-gpmi-fix-gpmi_nand_init-error-path.patch