[PATCH v5 20/20] media: meson-ir-tx: Prevent divide by zero in meson_irtx_prepare_pulse()

* [PATCH v5 20/20] media: meson-ir-tx: Prevent divide by zero in meson_irtx_prepare_pulse()
       [not found] <cover.1789460680.git.sean@mess.org>
@ 2026-09-15  8:32 ` Sean Young
  0 siblings, 0 replies; only message in thread
From: Sean Young @ 2026-09-15  8:32 UTC (permalink / raw)
  To: linux-media, Sean Young, Mauro Carvalho Chehab, Neil Armstrong,
	Kevin Hilman, Jerome Brunet, Martin Blumenstingl,
	Viktor Prutyanov
  Cc: Rik van Riel, stable, Mauro Carvalho Chehab, linux-arm-kernel,
	linux-amlogic, linux-kernel

If an excesively high carrier is set, meson_irtx_prepare_pulse() will
cause a divide by zero if tb_us is 0. Prevent such a carrier from being
set.

Fixes: 49be1c78d575 ("media: rc: introduce Meson IR TX driver")
Signed-off-by: Sean Young <sean@mess.org>
Cc: stable@vger.kernel.org
---
 drivers/media/rc/meson-ir-tx.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/rc/meson-ir-tx.c b/drivers/media/rc/meson-ir-tx.c
index 1ab898069e67..a0d07da09f67 100644
--- a/drivers/media/rc/meson-ir-tx.c
+++ b/drivers/media/rc/meson-ir-tx.c
@@ -219,6 +219,9 @@ static int meson_irtx_set_carrier(struct rc_dev *rc, u32 carrier)
 	if (carrier == 0)
 		return -EINVAL;
 
+	if (!DIV_ROUND_CLOSEST(USEC_PER_SEC, carrier))
+		return -EINVAL;
+
 	ir->carrier = carrier;
 	meson_irtx_set_mod(ir);
 
-- 
2.55.0


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