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Mon, 23 Jun 2025 02:00:18 -0700 (PDT) From: Bartosz Golaszewski Date: Mon, 23 Jun 2025 10:59:54 +0200 Subject: [PATCH v2 6/9] gpio: sysfs: don't look up exported lines as class devices Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250623-gpio-sysfs-chip-export-v2-6-d592793f8964@linaro.org> References: <20250623-gpio-sysfs-chip-export-v2-0-d592793f8964@linaro.org> In-Reply-To: <20250623-gpio-sysfs-chip-export-v2-0-d592793f8964@linaro.org> To: Ahmad Fatoum , Kent Gibson , =?utf-8?q?Jan_L=C3=BCbbe?= , Marek Vasut , Geert Uytterhoeven , Linus Walleij , Bartosz Golaszewski Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org, Bartosz Golaszewski X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=4839; i=bartosz.golaszewski@linaro.org; h=from:subject:message-id; bh=qH4qu97yZoN50VbMeaJJSPzOabP/6j28qPrt7PTU/qo=; b=owEBbQKS/ZANAwAKARGnLqAUcddyAcsmYgBoWRealUcoRRY0OStafiz3dgD4Xi6PpbdP2Ydn7 5yVnpwrFFSJAjMEAAEKAB0WIQQWnetsC8PEYBPSx58Rpy6gFHHXcgUCaFkXmgAKCRARpy6gFHHX cgMpEACVlJ7OIqJln5Z9luPvKIw8+qN0RAyFHrmMPwFjT7tyyRoVcnTYKcg9OgbENdzKndXVHfr V33Vmj9PWFv4bXBoTvbBeKAE6a3uL6DJaHek5XMqER4o6AXOgcxgdgp0DDCuHw4mJLu+0CjOUxa sYfaRyW8T8rx4DMiW9JnxaVmsjmYorzhVY+Sib0aHQz39Tsv1NrmhFo2MgqFEYEBHLKYls3LIXu 9p0zlG6SXtkx+vMTLm4lwLOZRYNMfYbb1ktbkmkCZaP5e2wrSMrLkNS1KYKAI+34bCoZOnm6D+2 E6tp+Cn0bHj0IMl1oKDVwKBPUk2ViqQjDRbPE8G05Rm+368eNwEXbPx1B7R8MxUYsB8nEGmLX6k j+cQOV5eSg/9sMSDhHZIhSBAOmzY3H8aScjEjuNngVJ1qBLQtse0GP8eR9Tgtgt73x5YBq/1k/n RbXhyEr+w4hJgFLhCWzJT6V5adNUlqiq99iy7GeFrbfzIL+9+NTw8sFIIAeiFf/DH53uZTLCqj9 1xKN/lid9CzrBHZxGdTCrN7uiGVmrMSjEoXOA3t9pgr+wHuyxAUJ5XQzBQ9PplET2DBKMJ3Ttgg 1sRUxRnqP90dd06kaqAEvIDd0GBEfFkH4V4Lv99Rkhc3EmIRQbtDvG6brFH2xmqPv9F3V8CLGf9 u3N4L7L0fLHqfeQ== X-Developer-Key: i=bartosz.golaszewski@linaro.org; a=openpgp; fpr=169DEB6C0BC3C46013D2C79F11A72EA01471D772 From: Bartosz Golaszewski In preparation for adding a parallel, per-chip attribute group for exported GPIO lines, stop using class device APIs to refer to it in the code. When unregistering the chip, don't call class_find_device() but instead store exported lines in a linked list inside the GPIO chip data object and look it up there. Signed-off-by: Bartosz Golaszewski Reviewed-by: Linus Walleij --- drivers/gpio/gpiolib-sysfs.c | 60 ++++++++++++++++++++++++++++++++--------= ---- 1 file changed, 44 insertions(+), 16 deletions(-) diff --git a/drivers/gpio/gpiolib-sysfs.c b/drivers/gpio/gpiolib-sysfs.c index 515fd0d307cf820b036b1ea966b300715992359f..adf030f74eb163f5d8b1092d004= 18b84354f923f 100644 --- a/drivers/gpio/gpiolib-sysfs.c +++ b/drivers/gpio/gpiolib-sysfs.c @@ -43,6 +43,7 @@ enum { =20 struct gpiod_data { struct gpio_desc *desc; + struct device *dev; =20 struct mutex mutex; struct kernfs_node *value_class_node; @@ -58,12 +59,15 @@ struct gpiod_data { struct attribute *attrs[GPIO_SYSFS_LINE_ATTR_SIZE]; struct attribute_group attr_group; const struct attribute_group *attr_groups[2]; + + struct list_head list; }; =20 struct gpiodev_data { struct gpio_device *gdev; struct device *cdev_base; /* Class device by GPIO base */ struct device *cdev_id; /* Class device by GPIO device ID */ + struct list_head exported_lines; }; =20 /* @@ -686,10 +690,10 @@ static void gpiod_attr_init(struct device_attribute *= dev_attr, const char *name, */ int gpiod_export(struct gpio_desc *desc, bool direction_may_change) { + struct gpiodev_data *gdev_data; struct gpiod_data *desc_data; struct gpio_device *gdev; struct attribute **attrs; - struct device *dev; int status; =20 /* can't export until sysfs is available ... */ @@ -751,25 +755,40 @@ int gpiod_export(struct gpio_desc *desc, bool directi= on_may_change) desc_data->attr_group.attrs =3D desc_data->attrs; desc_data->attr_groups[0] =3D &desc_data->attr_group; =20 - dev =3D device_create_with_groups(&gpio_class, &gdev->dev, - MKDEV(0, 0), desc_data, - desc_data->attr_groups, - "gpio%u", desc_to_gpio(desc)); - if (IS_ERR(dev)) { - status =3D PTR_ERR(dev); + /* + * Note: we need to continue passing desc_data here as there's still + * at least one known user of gpiod_export_link() in the tree. This + * function still uses class_find_device() internally. + */ + desc_data->dev =3D device_create_with_groups(&gpio_class, &gdev->dev, + MKDEV(0, 0), desc_data, + desc_data->attr_groups, + "gpio%u", + desc_to_gpio(desc)); + if (IS_ERR(desc_data->dev)) { + status =3D PTR_ERR(desc_data->dev); goto err_free_data; } =20 - desc_data->value_class_node =3D sysfs_get_dirent(dev->kobj.sd, "value"); + desc_data->value_class_node =3D sysfs_get_dirent(desc_data->dev->kobj.sd, + "value"); if (!desc_data->value_class_node) { status =3D -ENODEV; goto err_unregister_device; } =20 + gdev_data =3D gdev_get_data(gdev); + if (!gdev_data) { + status =3D -ENODEV; + goto err_unregister_device; + } + + list_add(&desc_data->list, &gdev_data->exported_lines); + return 0; =20 err_unregister_device: - device_unregister(dev); + device_unregister(desc_data->dev); err_free_data: kfree(desc_data); err_clear_bit: @@ -828,8 +847,9 @@ EXPORT_SYMBOL_GPL(gpiod_export_link); */ void gpiod_unexport(struct gpio_desc *desc) { - struct gpiod_data *desc_data; - struct device *dev; + struct gpiod_data *desc_data =3D NULL; + struct gpiodev_data *gdev_data; + struct gpio_device *gdev; =20 if (!desc) { pr_warn("%s: invalid GPIO\n", __func__); @@ -840,14 +860,22 @@ void gpiod_unexport(struct gpio_desc *desc) if (!test_bit(FLAG_EXPORT, &desc->flags)) return; =20 - dev =3D class_find_device(&gpio_class, NULL, desc, match_export); - if (!dev) + gdev =3D gpiod_to_gpio_device(desc); + gdev_data =3D gdev_get_data(gdev); + if (!gdev_data) return; =20 - desc_data =3D dev_get_drvdata(dev); + list_for_each_entry(desc_data, &gdev_data->exported_lines, list) + if (desc =3D=3D desc_data->desc) + break; + + if (!desc_data) + return; + + list_del(&desc_data->list); clear_bit(FLAG_EXPORT, &desc->flags); sysfs_put(desc_data->value_class_node); - device_unregister(dev); + device_unregister(desc_data->dev); =20 /* * Release irq after deregistration to prevent race with @@ -857,7 +885,6 @@ void gpiod_unexport(struct gpio_desc *desc) gpio_sysfs_free_irq(desc_data); } =20 - put_device(dev); mutex_destroy(&desc_data->mutex); kfree(desc_data); } @@ -899,6 +926,7 @@ int gpiochip_sysfs_register(struct gpio_device *gdev) return -ENOMEM; =20 data->gdev =3D gdev; + INIT_LIST_HEAD(&data->exported_lines); =20 guard(mutex)(&sysfs_lock); =20 --=20 2.48.1