linux-kernel - Re: [PATCH 08/11] Bluetooth: Add support for CG2900 UART

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Date:	Fri, 17 Dec 2010 13:02:52 +0100
From:	Vitaly Wool <vitalywool@...il.com>
To:	Par-Gunnar Hjalmdahl <par-gunnar.p.hjalmdahl@...ricsson.com>
Cc:	Pavan Savoy <pavan_savoy@...y.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Arnd Bergmann <arnd@...db.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Marcel Holtmann <marcel@...tmann.org>,
	linux-kernel@...r.kernel.org, linux-bluetooth@...r.kernel.org,
	Lukasz Rymanowski <Lukasz.Rymanowski@...to.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Par-Gunnar Hjalmdahl <pghatwork@...il.com>
Subject: Re: [PATCH 08/11] Bluetooth: Add support for CG2900 UART

Hi Par,

so on the top level: this is yet another H4 implementation plus
channel-based packet routing, right?

Could you please also elaborate

More comments on the code are inlined.

> +#define MAIN_DEV               (uart_info->dev)

What is that for?

> + * cg2900_uart_suspend() - Called by Linux PM to put the device in a low power mode.
> + * @pdev:      Pointer to platform device.
> + * @state:     New state.
> + *
> + * In UART case, CG2900 driver does nothing on suspend.
> + *
> + * Returns:
> + *   0 - Success.
> + */
> +static int cg2900_uart_suspend(struct platform_device *pdev, pm_message_t state)
> +{
> +       struct uart_info *uart_info = dev_get_drvdata(&pdev->dev);
> +
> +       if (uart_info->sleep_state == CHIP_POWERED_DOWN)
> +               return 0;
> +
> +       if (uart_info->sleep_state != CHIP_ASLEEP)
> +               return -EBUSY;
> +
> +       dev_dbg(MAIN_DEV, "New sleep_state: CHIP_SUSPENDED\n");
> +       uart_info->sleep_state = CHIP_SUSPENDED;
> +       return 0;
> +}

I don't think this is safe wrt work queue. What if it gets scheduled
when drivers are suspended?

Thanks,
   Vitaly
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