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Sat, 29 Aug 2026 09:34:45 -0700 (PDT) Received: from systembl0wer ([2a02:8308:4092:11f0::f9f]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49b4e2c1af7sm233169495e9.15.2026.08.29.09.34.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 29 Aug 2026 09:34:44 -0700 (PDT) Date: Sat, 29 Aug 2026 18:34:43 +0200 From: Joshua Crofts To: Cong Nguyen Cc: Jonathan Cameron , Matt Ranostay , Andy Shevchenko , David Lechner , Nuno =?UTF-8?B?U8Oh?= , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] iio: proximity: pulsedlight: fix iio_device left registered on PM setup failure Message-ID: <20260829183443.3b5ac19f@systembl0wer> In-Reply-To: <20260828105909.2425439-1-congnt264@gmail.com> References: <20260828105909.2425439-1-congnt264@gmail.com> X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-redhat-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Fri, 28 Aug 2026 17:59:09 +0700 Cong Nguyen wrote: > pm_runtime_set_active() failing in probe() jumps to error_unreg_buffer, > which only calls iio_triggered_buffer_cleanup() -- it does not undo the > iio_device_register() that already succeeded a few lines above. probe() > then returns the error, the devm-managed indio_dev is freed, but the > iio core still has it registered: the sysfs/chardev nodes stay live and > point at freed memory. > > Add an error_unreg_dev label that unregisters the iio device before > falling through to the existing buffer cleanup, mirroring the teardown > order already used in lidar_remove(). > > Fixes: 4ac4e086fd8c ("iio: pulsedlight-lidar-lite: add runtime PM") > Assisted-by: Claude:claude-opus-4 > Signed-off-by: Cong Nguyen > --- > drivers/iio/proximity/pulsedlight-lidar-lite-v2.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c b/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c > index 400477b4c740..8a9ee21f2bf6 100644 > --- a/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c > +++ b/drivers/iio/proximity/pulsedlight-lidar-lite-v2.c > @@ -294,12 +294,14 @@ static int lidar_probe(struct i2c_client *client) > > ret = pm_runtime_set_active(&client->dev); > if (ret) > - goto error_unreg_buffer; > + goto error_unreg_dev; > pm_runtime_enable(&client->dev); > pm_runtime_idle(&client->dev); > > return 0; Hmm, you should just return iio_device_register() here instead of 0, as that should always be the last function called in any *_probe() function. No need to add a new label then. > +error_unreg_dev: > + iio_device_unregister(indio_dev); > error_unreg_buffer: > iio_triggered_buffer_cleanup(indio_dev); > -- Kind regards, Joshua Crofts