Messages in this thread | | | Date | Mon, 18 Jan 2016 16:22:51 +0800 | Subject | Re: [PATCH v3] i2c: imx: make bus recovery through pinctrl optional | From | Li Yang <> |
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On Fri, Jan 15, 2016 at 5:03 PM, Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote: > Hello Li, > > On Fri, Jan 15, 2016 at 04:46:06PM +0800, Li Yang wrote: >> On Fri, Jan 15, 2016 at 3:53 PM, Uwe Kleine-König >> <u.kleine-koenig@pengutronix.de> wrote: >> >> - i2c_imx_init_recovery_info(i2c_imx, pdev); >> >> + if (IS_ERR_OR_NULL(i2c_imx->pinctrl)) >> > >> > I'd prefer to set i2c_imx->pinctrl to NULL if it's not used and then use >> > >> > if (!i2c_imx->pinctrl) >> > >> > here. (Or maybe make i2c_imx_init_recovery_info aware of this situation >> > to keep the caller simple?) >> >> Setting not used pointer to NULL might be a good coding practice >> generally. But in this case neither the driver nor gpio framework >> checks if the pinctrl is NULL before accessing it. We still need the >> driver to make sure pinctrl is not used in this situation. The >> benefit of the proposed change seems to be pretty limited. :) > > At least it gets rid of IS_ERR_OR_NULL which is used wrongly more often > than not.
It's true that this API is not used a lot. Are you suggesting that it is poorly designed and probably should be removed? But I still don't quite get the point why it tends to be wrongly used. Do you consider the use in this patch a wrongly used case?
Regards, Leo
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