[PATCH V2] b43: warn when forcing PIO mode

[Larry Finger]

On 08/16/2011 02:44 PM, Rafał Miłecki wrote:
> We have resolved all the known issues with DMA mode, however some users
> (or distros) are still forcing PIO mode by config files. Without
> debugging enabled it's not noticable at all. Add the warning for them.
>
> Cc: Gregory Bellier<gregory.bellier at gmail.com>
> Signed-off-by: Rafał Miłecki<zajec5 at gmail.com>

ACKed-by: Larry Finger <Larry.Finger at lwfinger.net>


> ---
> V2: typo in "parameter". I have to install spell checker for vim ;)
> Thx Gregory.
> ---
>   drivers/net/wireless/b43/main.c |    9 +++++++--
>   1 files changed, 7 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
> index 1adadc8..e0b1156 100644
> --- a/drivers/net/wireless/b43/main.c
> +++ b/drivers/net/wireless/b43/main.c
> @@ -4636,8 +4636,13 @@ static int b43_wireless_core_init(struct b43_wldev *dev)
>   	b43_shm_write16(dev, B43_SHM_SCRATCH, B43_SHM_SC_MAXCONT, 0x3FF);
>
>   	if (b43_bus_host_is_pcmcia(dev->dev) ||
> -	    b43_bus_host_is_sdio(dev->dev) ||
> -	    dev->use_pio) {
> +	    b43_bus_host_is_sdio(dev->dev)) {
> +		dev->__using_pio_transfers = 1;
> +		err = b43_pio_init(dev);
> +	} else if (dev->use_pio) {
> +		b43warn(dev->wl, "Forced PIO by use_pio module parameter. "
> +			"This should not be needed and will result in lower "
> +			"performance.\n");
>   		dev->__using_pio_transfers = 1;
>   		err = b43_pio_init(dev);
>   	} else {