netdev - Re: [PATCH net-next 09/10] net/mlx5: Fix global UAR mapping

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Message-Id: <20160228.004340.1152028301149683990.davem@davemloft.net>
Date:	Sun, 28 Feb 2016 00:43:40 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	saeedm@...lanox.com
Cc:	netdev@...r.kernel.org, ogerlitz@...lanox.com, talal@...lanox.com,
	eranbe@...lanox.com, moshel@...lanox.com
Subject: Re: [PATCH net-next 09/10] net/mlx5: Fix global UAR mapping

From: Saeed Mahameed <saeedm@...lanox.com>
Date: Thu, 25 Feb 2016 18:33:19 +0200

> @@ -246,11 +246,11 @@ int mlx5_alloc_map_uar(struct mlx5_core_dev *mdev, struct mlx5_uar *uar)
>  		err = -ENOMEM;
>  		goto err_free_uar;
>  	}
> -
> -	if (mdev->priv.bf_mapping)
> -		uar->bf_map = io_mapping_map_wc(mdev->priv.bf_mapping,
> -						uar->index << PAGE_SHIFT);
> -
> +#ifdef ARCH_HAS_IOREMAP_WC
> +	uar->bf_map = ioremap_wc(pfn << PAGE_SHIFT, PAGE_SIZE);
> +	if (!uar->bf_map)
> +		mlx5_core_warn(mdev, "ioremap_wc() failed\n");
> +#endif

Sorry, this looks very wrong to me.

It makes no sense to only map this resource if ARCH_HAS_IOREMAP_WC
defined.

The interface _always_ exists, and ARCH_HAS_IOREMAP_WC is an internal
symbol that include/asm-generic/iomap.h uses to determine whether to
provide a generic implementation of the interface or not.

I'm not applying this series until you either fix or explain what
you are doing here in the commit message.

Thanks.