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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b76f5162d31sm235196766b.9.2025.11.27.10.38.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 27 Nov 2025 10:38:48 -0800 (PST) Message-ID: Date: Thu, 27 Nov 2025 19:38:45 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 5/6] iio: accel: Prevent NULL pointer dereference in interrupt setup To: Rudraksha Gupta , Andy Shevchenko Cc: Bjorn Andersson , Konrad Dybcio , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Jonathan Cameron , David Lechner , =?UTF-8?Q?Nuno_S=C3=A1?= , Andy Shevchenko , linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org References: <20251124-expressatt_nfc_accel_magn_light-v4-0-9c5686ad67e2@gmail.com> <20251124-expressatt_nfc_accel_magn_light-v4-5-9c5686ad67e2@gmail.com> <61e860e7-fc3b-49ad-bf6a-9745f205d52b@gmail.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <61e860e7-fc3b-49ad-bf6a-9745f205d52b@gmail.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-GUID: t-TkIE8z54KOy-_fzyPPZE-YgpVukrnG X-Authority-Analysis: v=2.4 cv=AufjHe9P c=1 sm=1 tr=0 ts=69289aba cx=c_pps a=WeENfcodrlLV9YRTxbY/uA==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=6UeiqGixMTsA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=9AdMxfjQAAAA:20 a=P8M0t_FSf_X-oylKYQYA:9 a=QEXdDO2ut3YA:10 a=kacYvNCVWA4VmyqE58fU:22 a=bA3UWDv6hWIuX7UZL3qL:22 X-Proofpoint-ORIG-GUID: t-TkIE8z54KOy-_fzyPPZE-YgpVukrnG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTI3MDE0MCBTYWx0ZWRfXzaUQ07VpRxga pfKPbX+shl+iDK0iankagQh0WDb9oPCXxvQ8ir5wBZfciSBaQ9wszilWv6ym1FNrfF0q2Q3J2Zj bKs/6bHhaP/2baZAEotCb4GTiCzl6c7zI7oeB6pmUtCwtZGtHz90IDIadUD71dzFZwZwQ6cXZ/h HILplSiB9IOdeRNCopoXLEVYZfjERmYhaaP3GQCPHscC0WwBUnhVUKc/NqCD3CC2cY+qrbKF0w6 ivzZZ7EVKwNXKhHnQMWidnJ8iv2xdJ1xKNqokkP2t0BEpugE2qFsNdgmo9tuYYctxFviOTUFlcs hH4ucDUlJV0ncoq5AWGveeNrOcRRs6iaFcQhFikFiTmWVqYKzXT2/3/+hIafF4c/PuzmGb+OBTQ QgL4ufC1RoQERAPZhRuz8CxTaCfBCg== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2025-11-25_02,2025-11-27_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 priorityscore=1501 bulkscore=0 suspectscore=0 adultscore=0 phishscore=0 spamscore=0 impostorscore=0 lowpriorityscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2510240001 definitions=main-2511270140 On 11/25/25 10:23 PM, Rudraksha Gupta wrote: > > On 11/25/25 03:14, Andy Shevchenko wrote: >> On Tue, Nov 25, 2025 at 11:45:22AM +0100, Konrad Dybcio wrote: >>> On 11/25/25 12:35 AM, Rudraksha Gupta via B4 Relay wrote: >>>> The bmc150_accel_set_interrupt() function assumes that the interrupt >>>> info is provided. However, when no IRQ is provided, the info pointer >>>> remains NULL, leading to a kernel oops: >>> Hm, are you sure your device really doesn't have a pin connected to >>> the IC's interrupt line? >> I don't know the actual case here, but in general such a design occurred >> in real life. So, shouldn't be a surprise to see another polling only mode >> connection like this. [...] > This seems to be confirmed upstream too, where one has an irq: > > https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/st/ste-ux500-samsung-skomer.dts#L420 > > > and others don't: > > https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/st/ste-ux500-samsung-kyle.dts#L439 > > https://github.com/torvalds/linux/blob/master/arch/arm/boot/dts/st/ste-ux500-samsung-codina-tmo.dts#L506 Thanks for this investigation, it really seems like it's NC > Happy to split this patch series into two, just let me know! :) We won't be taking any non-urgent patches until rc1 drops (~3 weeks) so if the IIO folks decide to pick it up in meantime, just send it as one Konrad