Re: [PATCH v1 1/2] add device state flags and add error state

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

On 06.06.21 14:23, Oleksij Rempel wrote:
> Add state flags for each registered device and set error state on each
> dev_err print.
> This states can be used by users to identify erroneous device.

I thought this over a bit. We have dev_err calls when:
 
 - probes are permanently deferred
 - have actual probe (!= -ENODEV, != -ENXIO, != -EPROBE_DEFER)
 - after probe something fails (e.g. you got the regulator, but couldn't enable it)

So, I think the hook point is appropriate. Board code could extend this
and get a device and do some extra tests and use dev_set_err as appropriate.

So feel free to add:

Acked-by: Ahmad Fatoum <a.fatoum@pengutronix.de>

> Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
> ---
>  include/driver.h | 13 +++++++++++++
>  include/printk.h |  5 ++++-
>  2 files changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/include/driver.h b/include/driver.h
> index d84fe35d50..b64a8e258c 100644
> --- a/include/driver.h
> +++ b/include/driver.h
> @@ -88,6 +88,9 @@ struct device_d {
>  	 * when the driver should actually detect client devices
>  	 */
>  	int     (*detect) (struct device_d *);
> +
> +#define DEV_ERR			BIT(0)
> +	u32	run_flags;

Just turn it into a bit field instead?

>  };
>  
>  /** @brief Describes a driver present in the system */
> @@ -361,6 +364,16 @@ static inline int dev_close_default(struct device_d *dev, struct filep *f)
>  	return 0;
>  }
>  
> +static inline void dev_set_err(struct device_d *dev)
> +{
> +	dev->run_flags |= DEV_ERR;
> +}
> +
> +static inline bool dev_have_err(struct device_d *dev)
> +{
> +	return !!(dev->run_flags & DEV_ERR);
> +}
> +
>  struct bus_type {
>  	char *name;
>  	int (*match)(struct device_d *dev, struct driver_d *drv);
> diff --git a/include/printk.h b/include/printk.h
> index f83ad3bf07..6c563be3e6 100644
> --- a/include/printk.h
> +++ b/include/printk.h
> @@ -61,7 +61,10 @@ static inline int pr_print(int level, const char *format, ...)
>  #define dev_crit(dev, format, arg...)		\
>  	__dev_printf(2, (dev) , format , ## arg)
>  #define dev_err(dev, format, arg...)		\
> -	__dev_printf(3, (dev) , format , ## arg)
> +	({ \

You're already using statement expressions, so you could add a
		struct device_d *__dev = (dev);
here and use that.

> +		dev_set_err(dev); \
> +		__dev_printf(3, (dev) , format , ## arg); \
> +	})
>  #define dev_warn(dev, format, arg...)		\
>  	__dev_printf(4, (dev) , format , ## arg)
>  #define dev_notice(dev, format, arg...)		\
> 

-- 
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