Commit 89216494 authored by Linus Walleij's avatar Linus Walleij
Browse files

pinctrl: skip deferral of hogs 



Up until now, as hogs were always taken at the end of the
pin control device registration, it didn't cause any problem.
But when starting to hog pins from the device core it will
cause deferral of the pin controller device itself since the
default pin fetch is done *before* the device probes, so
let's fix this annoyance (which is also aesthetically ugly).

Also take some care to make sure that if any one map entry
results in a deferral rather than a failure, then that
deferral will take precedence.

Reviewed-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 9931faca

drivers/pinctrl/core.c

+24 −3
Original line number Diff line number Diff line
@@ -609,13 +609,16 @@ static int add_setting(struct pinctrl *p, struct pinctrl_map const *map) 


	setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);

	if (setting->pctldev == NULL) {

		dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",

			map->ctrl_dev_name);

		kfree(setting);

		/* Do not defer probing of hogs (circular loop) */

		if (!strcmp(map->ctrl_dev_name, map->dev_name))

			return -ENODEV;

		/*

		 * OK let us guess that the driver is not there yet, and

		 * let's defer obtaining this pinctrl handle to later...

		 */

		dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",

			map->ctrl_dev_name);

		return -EPROBE_DEFER;

	}
@@ -694,11 +697,29 @@ static struct pinctrl *create_pinctrl(struct device *dev) 
			continue;



		ret = add_setting(p, map);

		if (ret < 0) {

		/*

		 * At this point the adding of a setting may:

		 *

		 * - Defer, if the pinctrl device is not yet available

		 * - Fail, if the pinctrl device is not yet available,

		 *   AND the setting is a hog. We cannot defer that, since

		 *   the hog will kick in immediately after the device

		 *   is registered.

		 *

		 * If the error returned was not -EPROBE_DEFER then we

		 * accumulate the errors to see if we end up with

		 * an -EPROBE_DEFER later, as that is the worst case.

		 */

		if (ret == -EPROBE_DEFER) {

			pinctrl_put_locked(p, false);

			return ERR_PTR(ret);

		}

	}

	if (ret < 0) {

		/* If some other error than deferral occured, return here */

		pinctrl_put_locked(p, false);

		return ERR_PTR(ret);

	}



	/* Add the pinctrl handle to the global list */

	list_add_tail(&p->node, &pinctrl_list);

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