Subject: FAILED: patch "[PATCH] i3c: master: Do not treat master device as a duplicate target" failed to apply to 5.10-stable tree
To: adrian.hunter@intel.com,Frank.Li@nxp.com,alexandre.belloni@bootlin.com,mukesh.savaliya@oss.qualcomm.com
Cc: <stable@vger.kernel.org>
From: <gregkh@linuxfoundation.org>
Date: Fri, 04 Sep 2026 06:37:12 +0200
Message-ID: <2026090412-tidbit-broken-5a32@gregkh>
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The patch below does not apply to the 5.10-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 <stable@vger.kernel.org>.

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-5.10.y
git checkout FETCH_HEAD
git cherry-pick -x 4dc1b3eeba7991905a5b5b8129ebea51be7d87b7
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026090412-tidbit-broken-5a32@gregkh' --subject-prefix 'PATCH 5.10.y' 'HEAD^..'

Possible dependencies:


thanks,

greg k-h

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

From 4dc1b3eeba7991905a5b5b8129ebea51be7d87b7 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Fri, 7 Aug 2026 17:56:27 +0300
Subject: [PATCH] i3c: master: Do not treat master device as a duplicate target

i3c_master_search_i3c_dev_duplicate() searches the bus for another I3C
device with the same PID as the reference device.  The search can match
master->this, causing the controller itself to be returned as a
duplicate.

Since the controller is not a target device, it cannot be a duplicate of
one.  Exclude master->this from matching so that the function only
returns real duplicate target devices.

Fixes: 3a379bbcea0a ("i3c: Add core I3C infrastructure")
Cc: stable@vger.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Mukesh Savaliya <mukesh.savaliya@oss.qualcomm.com>
Link: https://patch.msgid.link/20260807145638.168865-4-adrian.hunter@intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index c7bb52b71d88..abb582645a2e 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -2545,7 +2545,8 @@ i3c_master_search_i3c_dev_duplicate(struct i3c_dev_desc *refdev)
 
 	i3c_bus_for_each_i3cdev(&master->bus, i3cdev) {
 		if (i3cdev != refdev && i3cdev->info.pid &&
-		    i3cdev->info.pid == refdev->info.pid)
+		    i3cdev->info.pid == refdev->info.pid &&
+		    i3cdev != master->this)
 			return i3cdev;
 	}