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

[Muhammad Usama Anjum]

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@xxxxxxxxxxxxx
>> [2] https://lore.kernel.org/all/20250428080242.466901-1-usama.anjum@xxxxxxxxxxxxx
>> [3] https://lore.kernel.org/all/20250516184952.878726-1-usama.anjum@xxxxxxxxxxxxx
>>
>> 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.


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