linux-kernel - Re: [PATCH] mlxsw: pci: switch from 'pci_' to 'dma

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Date:   Thu, 14 Jan 2021 11:47:07 +0200
From:   Ido Schimmel <idosch@...sch.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     jiri@...dia.com, idosch@...dia.com, davem@...emloft.net,
        kuba@...nel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] mlxsw: pci: switch from 'pci_' to 'dma_' API

On Thu, Jan 14, 2021 at 09:47:57AM +0100, Christophe JAILLET wrote:
> The wrappers in include/linux/pci-dma-compat.h should go away.
> 
> The patch has been generated with the coccinelle script below and has been
> hand modified to replace GFP_ with a correct flag.
> It has been compile tested.
> 
> When memory is allocated in 'mlxsw_pci_queue_init()' and
> 'mlxsw_pci_fw_area_init()' GFP_KERNEL can be used because both functions
> are already using this flag and no lock is acquired.
> 
> When memory is allocated in 'mlxsw_pci_mbox_alloc()' GFP_KERNEL can be used
> because it is only called from the probe function and no lock is acquired
> in the between.
> The call chain is:
>   --> mlxsw_pci_probe()
>     --> mlxsw_pci_cmd_init()
>       --> mlxsw_pci_mbox_alloc()
> 
> While at it, also replace the 'dma_set_mask/dma_set_coherent_mask' sequence
> by a less verbose 'dma_set_mask_and_coherent() call.

[...]

> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>

For net-next:

Tested-by: Ido Schimmel <idosch@...dia.com>

Thanks