linux-kernel - Re: [PATCH v1] can: mcp251xfd: use regmap_bulk

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Date:   Fri, 22 Jan 2021 09:14:25 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     Su <suyanjun218@...il.com>, manivannan.sadhasivam@...aro.org,
        thomas.kopp@...rochip.com, wg@...ndegger.com, davem@...emloft.net,
        kuba@...nel.org, lgirdwood@...il.com, broonie@...nel.org
Cc:     linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] can: mcp251xfd: use regmap_bulk_write for
 compatibility

On 1/22/21 8:59 AM, Su wrote:
> 
> 在 2021/1/22 下午3:26, Marc Kleine-Budde 写道:
>> On 1/22/21 4:02 AM, Su Yanjun wrote:
>>> Recently i use mcp2518fd on 4.x kernel which multiple write is not
>>> backported, regmap_raw_write will cause old kernel crash because the
>>> tx buffer in driver is smaller then 2K. Use regmap_bulk_write instead
>>> for compatibility.
>> Hmmm, this patch will never be backported to any 4.x kernel, as the driver is
>> not available on these kernels. You have to carry patches for these kernels
>> anyway, so I think I'll not take that patch. Sorry. Drop me a note if you are
>> interested in updating your kernel to a recent v5.11 kernel.
> 
> I got it. I have already port it to 4.x kernel. I just want anyone 
> working on old kernels to use the driver more easier.

Ok, you can post a link yo your repo with the patches for the interested reader.

Marc

-- 
Pengutronix e.K.                 | Marc Kleine-Budde           |
Embedded Linux                   | https://www.pengutronix.de  |
Vertretung West/Dortmund         | Phone: +49-231-2826-924     |
Amtsgericht Hildesheim, HRA 2686 | Fax:   +49-5121-206917-5555 |



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