FAILED: patch "[PATCH] iio: temperature: ltc2983: Fix n_wires default bypassing" failed to apply to 6.1-stable tree

FAILED: patch "[PATCH] iio: temperature: ltc2983: Fix n_wires default bypassing" failed to apply to 6.1-stable tree

[gregkh]

The patch below does not apply to the 6.1-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-6.1.y
git checkout FETCH_HEAD
git cherry-pick -x 434c150752675f44dc52c384a7fa22e5176bc35a
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2026071357-boat-germproof-a30c@gregkh' --subject-prefix 'PATCH 6.1.y' 'HEAD^..'

Possible dependencies:



thanks,

greg k-h

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

From 434c150752675f44dc52c384a7fa22e5176bc35a Mon Sep 17 00:00:00 2001
From: Liviu Stan <liviu.stan@analog.com>
Date: Mon, 25 May 2026 19:39:28 +0300
Subject: [PATCH] iio: temperature: ltc2983: Fix n_wires default bypassing
 rotation check

When adi,number-of-wires is absent, n_wires is left at 0. The binding
documents a default of 2 wires, matching the hardware default. However
the current-rotate validation checks n_wires == 2 || n_wires == 3, so
with n_wires = 0 the guard is bypassed and adi,current-rotate is accepted
for a 2-wire RTD.

Initialize n_wires = 2 to match the binding default and ensure the
rotation check fires correctly when the property is absent.

Fixes: f110f3188e56 ("iio: temperature: Add support for LTC2983")
Signed-off-by: Liviu Stan <liviu.stan@analog.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
index 38e6f8dfd3b8..1f835e326b93 100644
--- a/drivers/iio/temperature/ltc2983.c
+++ b/drivers/iio/temperature/ltc2983.c
@@ -741,7 +741,7 @@ ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
 	struct ltc2983_rtd *rtd;
 	int ret = 0;
 	struct device *dev = &st->spi->dev;
-	u32 excitation_current = 0, n_wires = 0;
+	u32 excitation_current = 0, n_wires = 2;
 
 	rtd = devm_kzalloc(dev, sizeof(*rtd), GFP_KERNEL);
 	if (!rtd)

[PATCH 6.1.y] iio: temperature: ltc2983: Fix n_wires default bypassing rotation check

[Liviu Stan]

When adi,number-of-wires is absent, n_wires is left at 0. The binding
documents a default of 2 wires, matching the hardware default. However
the current-rotate validation checks n_wires == 2 || n_wires == 3, so
with n_wires = 0 the guard is bypassed and adi,current-rotate is accepted
for a 2-wire RTD.

Initialize n_wires = 2 to match the binding default and ensure the
rotation check fires correctly when the property is absent.

Fixes: f110f3188e56 ("iio: temperature: Add support for LTC2983")
Signed-off-by: Liviu Stan <liviu.stan@analog.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
(cherry picked from commit 434c150752675f44dc52c384a7fa22e5176bc35a)
Signed-off-by: Liviu Stan <liviu.stan@analog.com>

[ Liviu Stan: resolve conflict - keep fwnode_handle *ref declaration
  which was removed upstream by a later refactor not in 6.1.y ]
---
 drivers/iio/temperature/ltc2983.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iio/temperature/ltc2983.c b/drivers/iio/temperature/ltc2983.c
index 1117991ca2ab..b37c1e60b328 100644
--- a/drivers/iio/temperature/ltc2983.c
+++ b/drivers/iio/temperature/ltc2983.c
@@ -706,7 +706,7 @@ ltc2983_rtd_new(const struct fwnode_handle *child, struct ltc2983_data *st,
 	int ret = 0;
 	struct device *dev = &st->spi->dev;
 	struct fwnode_handle *ref;
-	u32 excitation_current = 0, n_wires = 0;
+	u32 excitation_current = 0, n_wires = 2;
 
 	rtd = devm_kzalloc(dev, sizeof(*rtd), GFP_KERNEL);
 	if (!rtd)
-- 
2.43.0

Re: [PATCH 6.1.y] iio: temperature: ltc2983: Fix n_wires default bypassing rotation check

[Sasha Levin]

> Initialize n_wires = 2 to match the binding default and ensure the
> rotation check fires correctly when the property is absent.

Queued for 6.1, thanks.

-- 
Thanks,
Sasha