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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20250715132509.2643305-1-usama.anjum@collabora.com>
Date: Tue, 15 Jul 2025 18:25:06 +0500
From: Muhammad Usama Anjum <usama.anjum@...labora.com>
To: Manivannan Sadhasivam <mani@...nel.org>,
	Jeff Hugo <jeff.hugo@....qualcomm.com>,
	Muhammad Usama Anjum <usama.anjum@...labora.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: [PATCH v2 0/3] bus: mhi: keep dma buffers through suspend/hibernation cycles

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(-)

-- 
2.39.5