linux-kernel - [PATCH v9 3/3] firmware: qcom_scm: Use TASK_IDLE state in wait_for_wq

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-prev] [day] [month] [year] [list]

Message-Id: <20251123-multi_waitq_scm-v9-3-0080fc259d4d@oss.qualcomm.com>
Date: Sun, 23 Nov 2025 19:49:32 +0530
From: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
To: Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Unnathi Chalicheemala <unnathi.chalicheemala@....qualcomm.com>,
        Shivendra Pratap <shivendra.pratap@....qualcomm.com>
Subject: [PATCH v9 3/3] firmware: qcom_scm: Use TASK_IDLE state in
 wait_for_wq_completion()

From: Unnathi Chalicheemala <unnathi.chalicheemala@....qualcomm.com>

When the kernel issues an SMC (Secure Monitor Call) and the firmware
requests the kernel to wait, the waiting thread enters an
uninterruptible (D) state. In case of an extended wait request by the
firmware, any device suspend request, cannot proceed because of the
thread stuck in D state. This blocks the device suspend.

Replace wait_for_completion() with wait_for_completion_state(...,
TASK_IDLE), so that the waiting thread, show up in TASK_IDLE state,
instead of TASK_UNINTERRUPTIBLE (D state). This allows the thread to
block until completion, without blocking the device suspend.

Signed-off-by: Unnathi Chalicheemala <unnathi.chalicheemala@....qualcomm.com>
Signed-off-by: Shivendra Pratap <shivendra.pratap@....qualcomm.com>
---
 drivers/firmware/qcom/qcom_scm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 149c2ccec2a5ff77054178fa021fd0b721d9f8d7..dfe0410fa9f965b16f8b0a9d98f3046e80b8b97b 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -2320,7 +2320,7 @@ int qcom_scm_wait_for_wq_completion(u32 wq_ctx)
 	if (IS_ERR(wq))
 		return PTR_ERR(wq);

-	wait_for_completion(wq);
+	wait_for_completion_state(wq, TASK_IDLE);

 	return 0;
 }

-- 
2.34.1