linux-kernel - Re: [PATCH v3 15/23] ata: libahci: Don't read AHCI version twice in the save-config method

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Message-ID: <de7549b5-72f8-9809-a05c-d11f861df79e@suse.de>
Date:   Thu, 12 May 2022 09:00:43 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jens Axboe <axboe@...nel.dk>
Cc:     Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Rob Herring <robh+dt@...nel.org>, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v3 15/23] ata: libahci: Don't read AHCI version twice in
 the save-config method

On 5/12/22 01:18, Serge Semin wrote:
> There is no point in reading the AHCI version all over in the tail of the
> ahci_save_initial_config() method. That register is RO and doesn't change
> its value even after reset. So just reuse the data, which has already been
> read from there earlier in the head of the function.
> 
> Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> ---
>   drivers/ata/libahci.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
> index 000a7072614f..1ffaa5f5f21a 100644
> --- a/drivers/ata/libahci.c
> +++ b/drivers/ata/libahci.c
> @@ -564,7 +564,7 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv)
>   	/* record values to use during operation */
>   	hpriv->cap = cap;
>   	hpriv->cap2 = cap2;
> -	hpriv->version = readl(mmio + HOST_VERSION);
> +	hpriv->version = vers;
>   	hpriv->port_map = port_map;
>   
>   	if (!hpriv->start_engine)

Reviewed-by: Hannes Reinecke <hare@...e.de>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@...e.de			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer