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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH net-next v12 1/5] net: dsa: yt921x: Check lock status with lockdep_assert_held_once() Date: Thu, 3 Sep 2026 11:16:22 +0800 Message-ID: <20260903031630.356840-2-mmyangfl@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260903031630.356840-1-mmyangfl@gmail.com> References: <20260903031630.356840-1-mmyangfl@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit mutex_is_locked() was used to check the lock status. While it should not be triggered unless a bug is introduced, it does not warn on lock being held by another thread. Fix it with lockdep helpers. Signed-off-by: David Yang Reviewed-by: Andrew Lunn --- drivers/net/dsa/yt921x.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/dsa/yt921x.c b/drivers/net/dsa/yt921x.c index 159b16606f6c..44fcdd47ffb5 100644 --- a/drivers/net/dsa/yt921x.c +++ b/drivers/net/dsa/yt921x.c @@ -198,14 +198,14 @@ static u32 ethaddr_lo2_to_u32(const unsigned char *addr) static int yt921x_reg_read(struct yt921x_priv *priv, u32 reg, u32 *valp) { - WARN_ON(!mutex_is_locked(&priv->reg_lock)); + lockdep_assert_held_once(&priv->reg_lock); return priv->reg_ops->read(priv->reg_ctx, reg, valp); } static int yt921x_reg_write(struct yt921x_priv *priv, u32 reg, u32 val) { - WARN_ON(!mutex_is_locked(&priv->reg_lock)); + lockdep_assert_held_once(&priv->reg_lock); return priv->reg_ops->write(priv->reg_ctx, reg, val); } -- 2.53.0