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FAILED: patch "[PATCH] USB: gadget: core: adjust uevent timing on gadget unbind" failed to apply to 4.14-stable tree

PATCH [email protected] 1 participant 1 message Dec 11, 2023

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The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.14.y
git checkout FETCH_HEAD
git cherry-pick -x 73ea73affe8622bdf292de898da869d441da6a9d
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2023121135-recall-dagger-3009@gregkh' --subject-prefix 'PATCH 4.14.y' HEAD^..

Possible dependencies:

73ea73affe86 ("USB: gadget: core: adjust uevent timing on gadget unbind") 50966da807c8 ("usb: gadget: udc: core: Offload usb_udc_vbus_handler processing") 1016fc0c096c ("USB: gadget: Fix obscure lockdep violation for udc_mutex") f9d76d15072c ("USB: gadget: Add ID numbers to gadget names")
fc274c1e9973 ("USB: gadget: Add a new bus for gadgets")
6ebb449f9f25 ("USB: gadget: Register udc before gadget")
af1969a2d734 ("USB: gadget: Rename usb_gadget_probe_driver()")
710f5d627a98 ("Merge tag 'usb-5.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 73ea73affe8622bdf292de898da869d441da6a9d Mon Sep 17 00:00:00 2001
From: Roy Luo <[email protected]>
Date: Tue, 28 Nov 2023 22:17:56 +0000
Subject: [PATCH] USB: gadget: core: adjust uevent timing on gadget unbind

The KOBJ_CHANGE uevent is sent before gadget unbind is actually executed, resulting in inaccurate uevent emitted at incorrect timing (the uevent would have USB_UDC_DRIVER variable set while it would soon be removed).
Move the KOBJ_CHANGE uevent to the end of the unbind function so that uevent is sent only after the change has been made.

Fixes 2ccea03a8f7e ("usb: gadget: introduce UDC Class")
drivers/usb/gadget/udc/core.c +2 -2
index ded9531f141b..d59f94464b87 100644
@@ -1646,8 +1646,6 @@ static void gadget_unbind_driver(struct device *dev)
 
 	dev_dbg(&udc->dev, "unbinding gadget driver [%s]\n", driver->function);
 
-	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
-
 	udc->allow_connect = false;
 	cancel_work_sync(&udc->vbus_work);
 	mutex_lock(&udc->connect_lock);
@@ -1667,6 +1665,8 @@ static void gadget_unbind_driver(struct device *dev)
 	driver->is_bound = false;
 	udc->driver = NULL;
 	mutex_unlock(&udc_lock);
+
+	kobject_uevent(&udc->dev.kobj, KOBJ_CHANGE);
 }
 
 /* ------------------------------------------------------------------------- */