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[103.229.16.4]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23de4289274sm116045285ad.43.2025.07.15.20.36.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 15 Jul 2025 20:36:50 -0700 (PDT) Message-ID: Date: Wed, 16 Jul 2025 11:36:45 +0800 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 0/3] bus: mhi: keep dma buffers through suspend/hibernation cycles To: Muhammad Usama Anjum , Manivannan Sadhasivam , Jeff Hugo , Youssef Samir , Matthew Leung , Alexander Wilhelm , Kunwu Chan , Krishna Chaitanya Chundru , Jacek Lawrynowicz , Yan Zhen , Sujeev Dias , Greg Kroah-Hartman , Siddartha Mohanadoss , mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: kernel@collabora.com References: <20250715132509.2643305-1-usama.anjum@collabora.com> Content-Language: en-US From: Baochen Qiang In-Reply-To: <20250715132509.2643305-1-usama.anjum@collabora.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Proofpoint-ORIG-GUID: KtbRV5BiivIlaDHayUU1QU7tPZOVE6oG X-Authority-Analysis: v=2.4 cv=D4xHKuRj c=1 sm=1 tr=0 ts=68771e54 cx=c_pps a=MTSHoo12Qbhz2p7MsH1ifg==:117 a=nuhDOHQX5FNHPW3J6Bj6AA==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=VwQbUJbxAAAA:8 a=QX4gbG5DAAAA:8 a=hUY_jMkgKMZyhPis8EMA:9 a=QEXdDO2ut3YA:10 a=GvdueXVYPmCkWapjIL-Q:22 a=AbAUZ8qAyYyZVLSsDulk:22 X-Proofpoint-GUID: KtbRV5BiivIlaDHayUU1QU7tPZOVE6oG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzE2MDAzMCBTYWx0ZWRfX3aORe5QlIKaA Ykf+dXVRB9e+NgUU1poBGLz+o+X0sTrOMek3oEex41yi/Rn1sBw8Q4fzfdE8Xn3oiypt10Eu+yH hlWpOWRNdrGXRv1ns3IdXsKhE5hTpq3bspXfmmQ+UWETccGB3I2pbPd8m9sqiBm60dJaMl8Wjps vW1TkhmMpOO/ojncqydbnHYdteWtl5noYz+Se/+bAGQWSEhadSrmX1asCW2Ta9TitxF0dqCEhjy YRezdE2Y4Luc1+13IyvcwOhInLFpjpcMQHtd5ktBLlp4NGMZUFdi2NjkOxvWnewplh/0Tarft96 himGd29eSVcFpcrecqRrqjEpwMXrFD7YQB5iV33D0jNXtbYZlMHgOHuZvIW/rvMQt2TK2+CRxS7 eQ/Hoa7897gQ+k9TSmABcbbK3w+61q+4sa6Bxywgt86H0r5l8SGR2OEk7Hr55gTBuEFtdjrF X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-07-16_01,2025-07-15_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=763 impostorscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 malwarescore=0 suspectscore=0 bulkscore=0 mlxscore=0 priorityscore=1501 phishscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2507160030 On 7/15/2025 9:25 PM, Muhammad Usama Anjum wrote: > When there is memory pressure during resume and no DMA memory is > available, the ath11k driver fails to resume. The driver currently > frees its DMA memory during suspend or hibernate, and attempts to > re-allocate it during resume. However, if the DMA memory has been > consumed by other software in the meantime, these allocations can > fail, leading to critical failures in the WiFi driver. It has been > reported [1]. > > Although I have recently fixed several instances [2] [3] to ensure > DMA memory is not freed once allocated, we continue to receive > reports of new failures. > > In this series, 3 more such cases are being fixed. There are still > some cases which I'm trying to fix. They can be discussed separately. > > [1] https://lore.kernel.org/all/ead32f5b-730a-4b81-b38f-93d822f990c6@collabora.com > [2] https://lore.kernel.org/all/20250428080242.466901-1-usama.anjum@collabora.com > [3] https://lore.kernel.org/all/20250516184952.878726-1-usama.anjum@collabora.com > > Muhammad Usama Anjum (3): > bus: mhi: host: keep bhi buffer through suspend cycle > bus: mhi: host: keep bhie buffer through suspend cycle > bus: mhi: keep device context through suspend cycles > > drivers/bus/mhi/host/boot.c | 44 ++++++++++++++++++++------------- > drivers/bus/mhi/host/init.c | 41 ++++++++++++++++++++++++++---- > drivers/bus/mhi/host/internal.h | 2 ++ > include/linux/mhi.h | 2 ++ > 4 files changed, 67 insertions(+), 22 deletions(-) > changelog missing