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Sun, 20 Sep 2026 23:24:56 -0700 (PDT) Received: from DESKTOP-G3E0OSP.localdomain ([58.224.60.243]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-877aa107908sm2750128b3a.46.2026.09.20.23.24.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 20 Sep 2026 23:24:56 -0700 (PDT) From: Jinseob Kim To: jic23@kernel.org Cc: dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] iio: buffer: serialize buffer teardown with mode claims Date: Mon, 21 Sep 2026 15:24:21 +0900 Message-ID: <20260921062421.64647-1-kimjinseob88@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Buffer-mode claims hold mlock to guarantee that the device remains in buffer mode until the claim is released. Normal buffer updates take info_exist_lock followed by mlock in iio_update_buffers(). However, iio_device_unregister() disables and deactivates all buffers without taking mlock. This can invalidate buffer state, including active_scan_mask, while a buffer-mode claim is held. Take mlock in iio_disable_all_buffers() so that unregister honors the mode-claim lifetime guarantee. The info_exist_lock -> mlock ordering matches iio_update_buffers(). Fixes: 0a8565425afd ("iio: core: introduce iio_device_{claim|release}_buffe= r_mode() APIs") Suggested-by: Jonathan Cameron Signed-off-by: Jinseob Kim Reviewed-by: Joshua Crofts Reviewed-by: Nuno S=C3=A1 --- drivers/iio/industrialio-buffer.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-b= uffer.c index 2c9ec93dff47..d60bad5492e7 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -1377,6 +1377,10 @@ EXPORT_SYMBOL_GPL(iio_update_buffers); =20 void iio_disable_all_buffers(struct iio_dev *indio_dev) { + struct iio_dev_opaque *iio_dev_opaque =3D to_iio_dev_opaque(indio_dev); + + guard(mutex)(&iio_dev_opaque->mlock); + iio_disable_buffers(indio_dev); iio_buffer_deactivate_all(indio_dev); } base-commit: dceba8e581e3e8f475da0efbd7a73f3d9524ddd2 --=20 2.43.0