netdev - Re: [PATCH v6 6/7] nfc: pn533: Add autopoll capability

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Date:   Tue, 20 Aug 2019 14:23:44 +0200
From:   Johan Hovold <johan@...nel.org>
To:     Lars Poeschel <poeschel@...onage.de>
Cc:     Allison Randal <allison@...utok.net>,
        Steve Winslow <swinslow@...il.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "open list:NFC SUBSYSTEM" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH v6 6/7] nfc: pn533: Add autopoll capability

On Tue, Aug 20, 2019 at 02:03:43PM +0200, Lars Poeschel wrote:
> pn532 devices support an autopoll command, that lets the chip
> automatically poll for selected nfc technologies instead of manually
> looping through every single nfc technology the user is interested in.
> This is faster and less cpu and bus intensive than manually polling.
> This adds this autopoll capability to the pn533 driver.
> 
> Cc: Johan Hovold <johan@...nel.org>
> Signed-off-by: Lars Poeschel <poeschel@...onage.de>
> ---
> Changes in v6:
> - Rebased the patch series on v5.3-rc5

Just two drive-by comments below.

>  drivers/nfc/pn533/pn533.c | 193 +++++++++++++++++++++++++++++++++++++-
>  drivers/nfc/pn533/pn533.h |  10 +-
>  2 files changed, 197 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/nfc/pn533/pn533.c b/drivers/nfc/pn533/pn533.c
> index a8c756caa678..7e915239222b 100644
> --- a/drivers/nfc/pn533/pn533.c
> +++ b/drivers/nfc/pn533/pn533.c
> @@ -185,6 +185,32 @@ struct pn533_cmd_jump_dep_response {
>  	u8 gt[];
>  } __packed;
>  
> +struct pn532_autopoll_resp {
> +	u8 type;
> +	u8 ln;
> +	u8 tg;
> +	u8 tgdata[];
> +} __packed;

No need for __packed.

> +static int pn533_autopoll_complete(struct pn533 *dev, void *arg,
> +			       struct sk_buff *resp)
> +{
> +	u8 nbtg;
> +	int rc;
> +	struct pn532_autopoll_resp *apr;
> +	struct nfc_target nfc_tgt;
> +
> +	if (IS_ERR(resp)) {
> +		rc = PTR_ERR(resp);
> +
> +		nfc_err(dev->dev, "%s  autopoll complete error %d\n",
> +			__func__, rc);
> +
> +		if (rc == -ENOENT) {
> +			if (dev->poll_mod_count != 0)
> +				return rc;
> +			goto stop_poll;
> +		} else if (rc < 0) {
> +			nfc_err(dev->dev,
> +				"Error %d when running autopoll\n", rc);
> +			goto stop_poll;
> +		}
> +	}
> +
> +	nbtg = resp->data[0];
> +	if ((nbtg > 2) || (nbtg <= 0))
> +		return -EAGAIN;
> +
> +	apr = (struct pn532_autopoll_resp *)&resp->data[1];
> +	while (nbtg--) {
> +		memset(&nfc_tgt, 0, sizeof(struct nfc_target));
> +		switch (apr->type) {
> +		case PN532_AUTOPOLL_TYPE_ISOA:
> +			dev_dbg(dev->dev, "ISOA");

You forgot the '\n' here and elsewhere (some nfc_err as well).

Johan