linux-kernel - Re: [PATCH] iommu: Fix IOMMU debugfs fallout

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Date:   Thu, 21 Feb 2019 16:22:41 +0000
From:   Gary R Hook <ghook@....com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Joerg Roedel <joro@...tes.org>
CC:     "Hook, Gary" <Gary.Hook@....com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] iommu: Fix IOMMU debugfs fallout

On 2/20/19 7:05 AM, Geert Uytterhoeven wrote:
> A change made in the final version of IOMMU debugfs support replaced the
> public function iommu_debugfs_new_driver_dir() by the public dentry
> iommu_debugfs_dir in <linux/iommu.h>, but forgot to update both the
> implementation in iommu-debugfs.c, and the patch description.
> 
> Fix this by exporting iommu_debugfs_dir, and removing the reference to
> and implementation of iommu_debugfs_new_driver_dir().
> 
> Fixes: bad614b24293ae46 ("iommu: Enable debugfs exposure of IOMMU driver internals")
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>

Acked-by: Gary R Hook <gary.hook@....com>

> ---
>   drivers/iommu/iommu-debugfs.c | 23 ++++-------------------
>   1 file changed, 4 insertions(+), 19 deletions(-)
> 
> diff --git a/drivers/iommu/iommu-debugfs.c b/drivers/iommu/iommu-debugfs.c
> index 3b1bf88fd1b0494a..f0354894209648fd 100644
> --- a/drivers/iommu/iommu-debugfs.c
> +++ b/drivers/iommu/iommu-debugfs.c
> @@ -12,6 +12,7 @@
>   #include <linux/debugfs.h>
>   
>   struct dentry *iommu_debugfs_dir;
> +EXPORT_SYMBOL_GPL(iommu_debugfs_dir);
>   
>   /**
>    * iommu_debugfs_setup - create the top-level iommu directory in debugfs
> @@ -23,9 +24,9 @@ struct dentry *iommu_debugfs_dir;
>    * Emit a strong warning at boot time to indicate that this feature is
>    * enabled.
>    *
> - * This function is called from iommu_init; drivers may then call
> - * iommu_debugfs_new_driver_dir() to instantiate a vendor-specific
> - * directory to be used to expose internal data.
> + * This function is called from iommu_init; drivers may then use
> + * iommu_debugfs_dir to instantiate a vendor-specific directory to be used
> + * to expose internal data.
>    */
>   void iommu_debugfs_setup(void)
>   {
> @@ -48,19 +49,3 @@ void iommu_debugfs_setup(void)
>   		pr_warn("*************************************************************\n");
>   	}
>   }
> -
> -/**
> - * iommu_debugfs_new_driver_dir - create a vendor directory under debugfs/iommu
> - * @vendor: name of the vendor-specific subdirectory to create
> - *
> - * This function is called by an IOMMU driver to create the top-level debugfs
> - * directory for that driver.
> - *
> - * Return: upon success, a pointer to the dentry for the new directory.
> - *         NULL in case of failure.
> - */
> -struct dentry *iommu_debugfs_new_driver_dir(const char *vendor)
> -{
> -	return debugfs_create_dir(vendor, iommu_debugfs_dir);
> -}
> -EXPORT_SYMBOL_GPL(iommu_debugfs_new_driver_dir);
>