firmware: qcom_scm: Use TASK_IDLE state in wait_for_wq_completion()

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.

Reviewed-by: Mukesh Ojha <mukesh.ojha@oss.qualcomm.com>
Reviewed-by: Bartosz Golaszewski <brgl@kernel.org>
Signed-off-by: Unnathi Chalicheemala <unnathi.chalicheemala@oss.qualcomm.com>
Signed-off-by: Shivendra Pratap <shivendra.pratap@oss.qualcomm.com>
Reviewed-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Link: https://lore.kernel.org/r/20251217-multi_waitq_scm-v11-3-f21e50e792b8@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index c10062430e29961c8204a5ddcc6ccce4c6943859..3a78092b97f9b7d2fa3498baf66345b245117295 100644 (file)
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -2306,7 +2306,7 @@ 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;
 }