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Sun, 19 Jul 2026 15:33:29 -0700 (PDT) X-Received: by 2002:a17:903:2c03:b0:2ca:3df2:919a with SMTP id d9443c01a7336-2cf349c24c8mr130707155ad.33.1784500408875; Sun, 19 Jul 2026 15:33:28 -0700 (PDT) Received: from jic23-huawei ([50.35.46.84]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2cf346d9bd5sm46160675ad.45.2026.07.19.15.33.26 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 19 Jul 2026 15:33:28 -0700 (PDT) Date: Sun, 19 Jul 2026 23:33:23 +0100 From: Jonathan Cameron To: Andy Shevchenko Cc: Vidhu Sarwal , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, shreeya.patel@collabora.com, dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linux.dev Subject: Re: [PATCH] iio: light: ltrf216a: fix runtime PM reference leak in error path Message-ID: <20260719233244.0a3fd246@jic23-huawei> In-Reply-To: References: <20260713022829.234370-1-vidhu.linux@gmail.com> X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel-mentees@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Authority-Analysis: v=2.4 cv=POs/P/qC c=1 sm=1 tr=0 ts=6a5d50ba cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=qC1CW/w66vtJz1P9yTJxNA==:17 a=kj9zAlcOel0A:10 a=RAioF0-LDSMA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=ZpdpYltYx_vBUK5n70dp:22 a=QyXUC8HyAAAA:8 a=jVvKgFSebWTF7iFRTjoA:9 a=CjuIK1q_8ugA:10 a=GvdueXVYPmCkWapjIL-Q:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE5MDI1MyBTYWx0ZWRfXwle1p48h6QgL ZZjeBBOIhycMn1rbx2upnFuWiA195xCUXtALpHbgDshv/o4kOVvD32n+2aeF09Z+gMsJg5Fpy1f RQXvX4dB/RvvXSaixvMR7n46Gj+sS79l8uBcXD+Bl42LyZKEHMpzqOLorqtdTdywE6/ZSjn62bE zROKtSCBmapd2ffAxoCUPutGo/RagusyJBE3EEqAsJ/SN0q8Zf4R6xmloEsVOVwDQHkaNmjCiOc LasX1nusqIYDvF1x2oF7oro32pqDOZJfcNmsMDvUqbeLPtP/GsIi5bdJT6mGTiQH7blgz/hYzO1 AdlhLMpR6WF26F4MgrYDnHUo8ZjT2Q0iDou1CF4RJqjt44ZCjvkXQM6GsoCur48/3Ruo0q7ntTm QwpX+tUANJBbOf730kDlqB38y7wgP8i2FxwIWNbys1OF0CF0BhulcUeTcI5JOEKEcYSC/GxTlcW dgWvykCVr8GWYO/zvQg== X-Proofpoint-ORIG-GUID: iLHbZp8jMnbPKobSY7UkxOzdRTf5xPLp X-Proofpoint-GUID: iLHbZp8jMnbPKobSY7UkxOzdRTf5xPLp X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE5MDI1MyBTYWx0ZWRfX8lQ0BNgdwzQ8 OU0ORUMke+bV3a+akc6BMmYaE+we2RlWCJ2a4vCI0Fj6L9uZnKAS8DmiWLM4kCiTAJc27SpTUr2 bbCAWYCIYZc76BKVJp8o+F6MkeeOFe4= X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-19_07,2026-07-17_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 adultscore=0 clxscore=1011 suspectscore=0 priorityscore=1501 malwarescore=0 impostorscore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607190253 On Mon, 13 Jul 2026 15:36:51 +0300 Andy Shevchenko wrote: > On Mon, Jul 13, 2026 at 07:58:29AM +0530, Vidhu Sarwal wrote: > > ltrf216a_get_lux() acquires a runtime PM reference by calling > > ltrf216a_set_power_state(data, true). However, if > > ltrf216a_read_data() fails, the function returns immediately without > > dropping the reference. > > > > This leaves the runtime PM usage count unbalanced, preventing the device > > from autosuspending after a failed read. > > > > Fix this by releasing the runtime PM reference before returning from the > > error path. > > ... > > > static int ltrf216a_get_lux(struct ltrf216a_data *data) > > > greendata = ltrf216a_read_data(data, LTRF216A_ALS_DATA_0); > > - if (greendata < 0) > > + if (greendata < 0) { > > + ltrf216a_set_power_state(data, false); > > return greendata; > > + } > > > > ltrf216a_set_power_state(data, false); > > Wouldn't be simpler to do > > greendata = ltrf216a_read_data(data, LTRF216A_ALS_DATA_0); > > ltrf216a_set_power_state(data, false); > > if (greendata < 0) > return greendata; > > ? > > Not insisting on this. Up to Jonathan and others to decide. I merged a slight variant on what Andy has here to keep the greendata assignment and check closer together. diff --git a/drivers/iio/light/ltrf216a.c b/drivers/iio/light/ltrf216a.c index aad96fc91565..dd8f3260b1d8 100644 --- a/drivers/iio/light/ltrf216a.c +++ b/drivers/iio/light/ltrf216a.c @@ -248,11 +248,10 @@ static int ltrf216a_get_lux(struct ltrf216a_data *data) return ret; greendata = ltrf216a_read_data(data, LTRF216A_ALS_DATA_0); + ltrf216a_set_power_state(data, false); if (greendata < 0) return greendata; - ltrf216a_set_power_state(data, false); - lux = greendata * data->info->lux_multiplier * LTRF216A_WIN_FAC; return lux; > >