From: Christian Lamparter Date: Tue, 25 Dec 2018 20:54:42 +0000 (+0100) Subject: kernel: 4.19: fix usbport led trigger regression X-Git-Tag: state~206 X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=96d55f9fd990beed06b79a65100ef7c942dc125d;p=openwrt%2Fstaging%2Fchunkeey.git kernel: 4.19: fix usbport led trigger regression |In the patch "usb: simplify usbport trigger" together with |"leds: triggers: add device attribute support" caused an |regression for the usbport trigger. it will no longer |enumerate any "ports" (i.e the sysfs directory stays empty) |if the usb host drivers are fully initialized before the |usbport trigger was loaded. Signed-off-by: Christian Lamparter --- diff --git a/target/linux/generic/hack-4.19/160-leds-fix-regression-in-usbport-led-trigger.patch b/target/linux/generic/hack-4.19/160-leds-fix-regression-in-usbport-led-trigger.patch new file mode 100644 index 0000000000..c0eb5a78aa --- /dev/null +++ b/target/linux/generic/hack-4.19/160-leds-fix-regression-in-usbport-led-trigger.patch @@ -0,0 +1,84 @@ +From 38a3549ffc0033761063cc5c7b994ab075694db8 Mon Sep 17 00:00:00 2001 +From: Christian Lamparter +Date: Tue, 25 Dec 2018 21:11:08 +0100 +Subject: [RFC PATCH] leds: fix regression in usbport led trigger + +In the patch "usb: simplify usbport trigger" together with +"leds: triggers: add device attribute support" caused an +regression for the usbport trigger. it will no longer +enumerate any "ports" (i.e the sysfs directory stays empty) +if the usb host drivers are fully initialized before the +usbport trigger was loaded. + +The reason is that the usbport driver registers the sysfs +entries in the ports subdirectory during the activate() +callback. Whereas the patch +"leds: triggers: add device attribute support" made it so +that the sysfs "ports" group was only being added after +the activate() callback succeeded. + +This patch moves the device_add_groups() in front of the +call to the trigger's activate() function in order to +solve the problem. + +Fixes: 6f7b0bad8839 ("usb: simplify usbport trigger") +Signed-off-by: Christian Lamparter +--- + drivers/leds/led-triggers.c | 19 ++++++++++--------- + 1 file changed, 10 insertions(+), 9 deletions(-) + +diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c +index 17d73db1456e..08e7c724a9dc 100644 +--- a/drivers/leds/led-triggers.c ++++ b/drivers/leds/led-triggers.c +@@ -134,6 +134,12 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) + led_set_brightness(led_cdev, LED_OFF); + } + if (trig) { ++ ret = device_add_groups(led_cdev->dev, trig->groups); ++ if (ret) { ++ dev_err(led_cdev->dev, "Failed to add trigger attributes\n"); ++ goto err_add_groups; ++ } ++ + write_lock_irqsave(&trig->leddev_list_lock, flags); + list_add_tail(&led_cdev->trig_list, &trig->led_cdevs); + write_unlock_irqrestore(&trig->leddev_list_lock, flags); +@@ -146,12 +152,6 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) + + if (ret) + goto err_activate; +- +- ret = device_add_groups(led_cdev->dev, trig->groups); +- if (ret) { +- dev_err(led_cdev->dev, "Failed to add trigger attributes\n"); +- goto err_add_groups; +- } + } + + if (event) { +@@ -165,17 +165,18 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig) + + return 0; + +-err_add_groups: +- ++err_activate: ++ device_remove_groups(led_cdev->dev, trig->groups); + if (trig->deactivate) + trig->deactivate(led_cdev); +-err_activate: + + led_cdev->trigger = NULL; + led_cdev->trigger_data = NULL; + write_lock_irqsave(&led_cdev->trigger->leddev_list_lock, flags); + list_del(&led_cdev->trig_list); + write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags); ++ ++err_add_groups: + led_set_brightness(led_cdev, LED_OFF); + + return ret; +-- +2.20.1 +