FAILED: patch "[PATCH] iio: admv1013: initialize callback mutex before registering" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-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-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x baf7e43b7fb5afb777353bf265ddf9d909f72b9f
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026100645-snide-neatness-caed@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

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

From baf7e43b7fb5afb777353bf265ddf9d909f72b9f Mon Sep 17 00:00:00 2001
From: Runyu Xiao <[email protected]>
Date: Wed, 19 Aug 2026 22:17:51 +0800
Subject: [PATCH] iio: admv1013: initialize callback mutex before registering
notifier

admv1013_probe() registers a clock notifier whose callback takes st->lock on POST_RATE_CHANGE. Initialize the mutex before devm_clk_notifier_register() so the callback cannot observe an uninitialized lock during probe.

Use devm_mutex_init() so the lock lifetime is tied to the device and cleanup stays paired with the rest of the managed probe resources.

index c9baaab574e3..cdf33ccfd1f9 100644
@@ -601,11 +601,14 @@ static int admv1013_probe(struct spi_device *spi)
 				     "failed to get the LO input clock\n");
 
 	st->nb.notifier_call = admv1013_freq_change;
-	ret = devm_clk_notifier_register(dev, st->clkin, &st->nb);
+
+	ret = devm_mutex_init(dev, &st->lock);
 	if (ret)
 		return ret;
 
-	mutex_init(&st->lock);
+	ret = devm_clk_notifier_register(dev, st->clkin, &st->nb);
+	if (ret)
+		return ret;
 
 	ret = admv1013_init(st, vcm_uv);
 	if (ret)