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[78.88.45.245]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-b8edae3ae99sm516585566b.60.2026.02.10.01.39.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 10 Feb 2026 01:39:57 -0800 (PST) Message-ID: <7d61d324-0d26-47ce-aac6-d17abdcf05cd@oss.qualcomm.com> Date: Tue, 10 Feb 2026 10:39:54 +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 v2 1/4] soc: qcom: ice: Remove platform_driver support and expose as a pure library To: manivannan.sadhasivam@oss.qualcomm.com, Bjorn Andersson , Konrad Dybcio , Abel Vesa , Adrian Hunter , Ulf Hansson , Manivannan Sadhasivam , "James E.J. Bottomley" , "Martin K. Petersen" Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mmc@vger.kernel.org, linux-scsi@vger.kernel.org, Sumit Garg , stable@vger.kernel.org, Abel Vesa References: <20260210-qcom-ice-fix-v2-0-9c1ab5d6502c@oss.qualcomm.com> <20260210-qcom-ice-fix-v2-1-9c1ab5d6502c@oss.qualcomm.com> Content-Language: en-US From: Konrad Dybcio In-Reply-To: <20260210-qcom-ice-fix-v2-1-9c1ab5d6502c@oss.qualcomm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: 6n8vNKtISJ0AmGoix33hIVIO6ld76-Ol X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMjEwMDA4MCBTYWx0ZWRfX9VCrwSkmp9+X dAmIf7G+8AtdKrnKekZ0bJ+i1kcXzFzItseLMWCzWBuAxXW52/zxz6nQJeRKt9BRnWEtT2PxUc7 /m9M+duYHzZo2XLdNDlY+q5gNfYlaY7RfbofyQZaB7JKUjR4cZGx1F2aigvsJD6p6q0yFNQJbIt eInWYqUx/mR1B79Sncv6L8N+YE5Aq5bP4z0NsKFpSChHwnKXNjI/C3M3fsT4K1pRfyHeWq4PaxG sBY7QBkTE1Torj52KYDkUGXiMZn9Oc2l1vIp+cPs02yv8CxuDIfCLmtY4lvv4qfnQ+UNYxDW8f+ 1/EGQtY3lO+j3QXJ+9XBczkYoqm7J3Ao3oS3dQfzMwtF9vZLoywxOFTVjC/1UeKhfPLai/YKb1S U/JuFFvDTykZw0prmfMDPrE6+NdT4RKKKA1rzw3MU+svuNnGHNDvCJjCmVwTKz3WMH96JW3GlAp yu/GZxMeMbd7LP0BbDQ== X-Authority-Analysis: v=2.4 cv=F6Rat6hN c=1 sm=1 tr=0 ts=698afcf0 cx=c_pps a=50t2pK5VMbmlHzFWWp8p/g==:117 a=FpWmc02/iXfjRdCD7H54yg==:17 a=IkcTkHD0fZMA:10 a=HzLeVaNsDn8A:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22 a=GgsMoib0sEa3-_RKJdDe:22 a=EUspDBNiAAAA:8 a=Oy1HdLtELvYQmIkUJ8cA:9 a=QEXdDO2ut3YA:10 a=IoWCM6iH3mJn3m4BftBB:22 X-Proofpoint-GUID: 6n8vNKtISJ0AmGoix33hIVIO6ld76-Ol X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-02-09_01,2026-02-09_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 priorityscore=1501 phishscore=0 suspectscore=0 malwarescore=0 bulkscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602100080 On 2/10/26 7:56 AM, Manivannan Sadhasivam via B4 Relay wrote: > From: Manivannan Sadhasivam > > The current platform driver design causes probe ordering races with > consumers (UFS, eMMC) due to ICE's dependency on SCM firmware calls. If ICE > probe fails (missing ICE SCM or DT registers), devm_of_qcom_ice_get() loops > with -EPROBE_DEFER, leaving consumers non-functional even when ICE should > be gracefully disabled. devm_of_qcom_ice_get() cannot know if the ICE > driver probe has failed due to above reasons or it is waiting for the SCM > driver. [...] > -static void qcom_ice_put(const struct qcom_ice *ice) > +static void qcom_ice_put(struct kref *kref) > { > - struct platform_device *pdev = to_platform_device(ice->dev); > - > - if (!platform_get_resource_byname(pdev, IORESOURCE_MEM, "ice")) > - platform_device_put(pdev); > + platform_device_put(to_platform_device(ice_handle->dev)); > + ice_handle = NULL; > } > > static void devm_of_qcom_ice_put(struct device *dev, void *res) > { > - qcom_ice_put(*(struct qcom_ice **)res); > + const struct qcom_ice *ice = *(struct qcom_ice **)res; > + struct platform_device *pdev = to_platform_device(ice->dev); > + > + if (!platform_get_resource_byname(pdev, IORESOURCE_MEM, "ice")) > + kref_put(&ice_handle->refcount, qcom_ice_put); IIUC this makes the refcount go down only in the legacy DT case - why? Konrad