linux-kernel - Re: [PATCH V2 01/12 net-next] qca_spi: Improve SPI thread creation

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Message-ID: <0ecaa500-9dbf-48e1-97a9-13ba7c2563ae@intel.com>
Date: Wed, 20 Dec 2023 15:05:01 -0800
From: Jacob Keller <jacob.e.keller@...el.com>
To: Stefan Wahren <wahrenst@....net>, "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, "Paolo
 Abeni" <pabeni@...hat.com>
CC: <netdev@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 01/12 net-next] qca_spi: Improve SPI thread creation



On 12/18/2023 3:26 PM, Stefan Wahren wrote:
> The qca_spi driver create/stop the SPI kernel thread in case
> of netdev_open/close. This isn't optimal because there is no
> need for such an expensive operation.
> 
> So improve this by moving create/stop of the SPI kernel into
> the init/uninit ops. The open/close ops could just
> 'park/unpark' the SPI kernel thread.
> 

If I understand, this is also important because kthread_stop would
ultimately result in the task being destroyed and thus user space
configuration of the task (priority, pinning, etc) would be lost too.

Reviewed-by: Jacob Keller <jacob.e.keller@...el.com>