linux-kernel - Re: [PATCH 19/25] ASoC: mediatek: Convert to generic PCM copy ops

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Date:   Tue, 15 Aug 2023 16:58:02 +0300
From:   Andy Shevchenko <andriy.shevchenko@...el.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH 19/25] ASoC: mediatek: Convert to generic PCM copy ops

On Mon, Aug 14, 2023 at 01:55:17PM +0200, Takashi Iwai wrote:
> This patch converts the mediatek BT SCO driver code to use the new
> unified PCM copy callback.  It's a straightforward conversion from
> *_user() to *_iter() variants.  As copy_form/to_iter() updates the
> internal offset at each read/write, we can drop the cur_*_idx counter
> in the loop, too.
> 
> Note that copy_from/to_iter() returns the copied bytes, hence the
> error condition is inverted from copy_from/to_user().

...

> +		if (!copy_to_iter(bt->rx_packet_buf + cur_read_idx,

!= read_size ?

> +				  read_size, buf)) {
>  			dev_warn(bt->dev, "%s(), copy_to_user fail\n",

Forgot to fix the message.

>  				 __func__);
>  			return -EFAULT;

...

> +		if (!copy_from_iter(bt->tx_packet_buf + cur_write_idx,
> +				    write_size, buf)) {
>  			dev_warn(bt->dev, "%s(), copy_from_user fail\n",
>  				 __func__);
>  			return -EFAULT;

As per above.

-- 
With Best Regards,
Andy Shevchenko