linux-kernel - Re: [PATCH v2 0/3] bus: mhi: keep dma buffers through suspend/hibernation cycles

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Message-ID: <9fc6c67b-d313-47a9-b487-5edca5ca48ec@collabora.com>
Date: Thu, 17 Jul 2025 15:01:44 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Baochen Qiang <baochen.qiang@....qualcomm.com>,
 Manivannan Sadhasivam <mani@...nel.org>,
 Jeff Hugo <jeff.hugo@....qualcomm.com>,
 Youssef Samir <quic_yabdulra@...cinc.com>,
 Matthew Leung <quic_mattleun@...cinc.com>,
 Alexander Wilhelm <alexander.wilhelm@...termo.com>,
 Kunwu Chan <chentao@...inos.cn>,
 Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>,
 Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>,
 Yan Zhen <yanzhen@...o.com>, Sujeev Dias <sdias@...eaurora.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Siddartha Mohanadoss <smohanad@...eaurora.org>, mhi@...ts.linux.dev,
 linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: kernel@...labora.com
Subject: Re: [PATCH v2 0/3] bus: mhi: keep dma buffers through
 suspend/hibernation cycles

On 7/16/25 8:36 AM, Baochen Qiang wrote:
> 
> 
> 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
Sorry, missed the changelog in the cover letter. For now, please find
changelog in the individual patches. I'll add changelog if there would be
v3.


>