linux-kernel - Re: [PATCH v2] media: solo6x10: fix lockup by avoiding delayed register write

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Date:   Mon, 24 Oct 2016 06:57:25 +0200
From:   khalasa@...p.pl (Krzysztof Hałasa)
To:     Andrey Utkin <andrey.utkin@...p.bluecherry.net>
Cc:     mchehab@...nel.org, stable@...r.kernel.org,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        maintainers@...echerrydvr.com, andrey_utkin@...tmail.com,
        ismael@...ev.co.uk, hverkuil@...all.nl, hans.verkuil@...co.com
Subject: Re: [PATCH v2] media: solo6x10: fix lockup by avoiding delayed register write

Andrey Utkin <andrey.utkin@...p.bluecherry.net> writes:

> --- a/drivers/media/pci/solo6x10/solo6x10.h
> +++ b/drivers/media/pci/solo6x10/solo6x10.h
> @@ -284,7 +284,10 @@ static inline u32 solo_reg_read(struct solo_dev *solo_dev, int reg)
>  static inline void solo_reg_write(struct solo_dev *solo_dev, int reg,
>  				  u32 data)
>  {
> +	u16 val;
> +
>  	writel(data, solo_dev->reg_base + reg);
> +	pci_read_config_word(solo_dev->pdev, PCI_STATUS, &val);
>  }
>  
>  static inline void solo_irq_on(struct solo_dev *dev, u32 mask)

This is ok for now. I hope I will find some to refine this, so not all
register writes are done with the penalty - eventually.
-- 
Krzysztof Halasa

Industrial Research Institute for Automation and Measurements PIAP
Al. Jerozolimskie 202, 02-486 Warsaw, Poland