linux-kernel - Re: [PATCH] Bluetooth: Add hci

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Date:	Thu, 24 Oct 2013 11:41:53 -0700
From:	Joe Perches <joe@...ches.com>
To:	Pali Rohár <pali.rohar@...il.com>
Cc:	Marcel Holtmann <marcel@...tmann.org>,
	Gustavo Padovan <gustavo@...ovan.org>,
	Johan Hedberg <johan.hedberg@...il.com>,
	Pavel Machek <pavel@....cz>, linux-kernel@...r.kernel.org,
	linux-bluetooth@...r.kernel.org,
	Ивайло Димитров 
	<freemangordon@....bg>,
	Joni Lapilainen <joni.lapilainen@...il.com>,
	Sebastian Reichel <sre@...g0.de>,
	Aaro Koskinen <aaro.koskinen@....fi>
Subject: Re: [PATCH] Bluetooth: Add hci_h4p driver

On Fri, 2013-10-18 at 12:30 +0200, Pali Rohár wrote:

> I rebased patch on top of https://git.kernel.org/cgit/linux/kernel/git/bluetooth/bluetooth-next.git branch master

Hi Pali, just some trivial notes:

[]

+static ssize_t hci_h4p_show_bdaddr(struct device *dev,
> +                                  struct device_attribute *attr, char *buf)
> +{
> +       struct hci_h4p_info *info = dev_get_drvdata(dev);
> +
> +       return sprintf(buf, "%.2x:%.2x:%.2x:%.2x:%.2x:%.2x\n",
> +                      info->bd_addr[0], info->bd_addr[1], info->bd_addr[2],
> +                      info->bd_addr[3], info->bd_addr[4], info->bd_addr[5]);

sprintf(buf, "%pM", info->bd_addr)

and if this is really bluetooth, does the output need to
be emitted in reverse order?  ie: %pMR

[]

> +#define NBT_DBG(fmt, arg...) \
> +               pr_debug("%s: " fmt "" , __func__ , ## arg)
> +
> +#define NBT_DBG_FW(fmt, arg...) \
> +               pr_debug("%s: " fmt "" , __func__ , ## arg)
> +
> +#define NBT_DBG_POWER(fmt, arg...) \
> +               pr_debug("%s: " fmt "" , __func__ , ## arg)
> +
> +#define NBT_DBG_TRANSFER(fmt, arg...) \
> +               pr_debug("%s: " fmt "" , __func__ , ## arg)
> +
> +#define NBT_DBG_TRANSFER_NF(fmt, arg...) \
> +               pr_debug(fmt "" , ## arg)
> +
> +#define NBT_DBG_DMA(fmt, arg...) \
> +               pr_debug("%s: " fmt "" , __func__ , ## arg)

The "" isn't useful.

dynamic_debugging can add __func__ to each message output
with +f.

I think all of these should be converted to pr_debug
where used or consolidated into a single
#define nbt_dbg(mask, fmt, ...)			\
do {						\
	if (mask & debug)			\
		pr_debug(fmt, ##__VA_ARGS__);
} while (0)

and used like:
	nbt_dbg(TRANSFER, fmt, etc...);
where debug is some static.

Also there are many uses missing "\n" which can
cause interleaving problems with other printks.

[]

> +int hci_h4p_wait_for_cts(struct hci_h4p_info *info, int active,
> +                        int timeout_ms)
> +{
> +       unsigned long timeout;
> +       int state;
> +
> +       timeout = jiffies + msecs_to_jiffies(timeout_ms);
> +       for (;;) {

	while (time_before(jiffies, timeout)) {

> +               state = hci_h4p_inb(info, UART_MSR) & UART_MSR_CTS;
> +               if (active) {
> +                       if (state)
> +                               return 0;
> +               } else {
> +                       if (!state)
> +                               return 0;
> +               }
> +               if (time_after(jiffies, timeout))
> +                       return -ETIMEDOUT;

> +               msleep(1);
> +       }

	return -ETIMEDOUT;

> +}



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