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

[Hannes Reinecke]

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@xxxxxxxxxxxxxxxxxxxx>
> ---
>   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@xxxxxxx>

Cheers,

Hannes
--
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@xxxxxxx			                  +49 911 74053 688
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