linux-kernel - [PATCH] remoteproc: qcom: q6v5: Fix a race condition on fatal crash

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Date:   Mon,  1 Oct 2018 19:55:00 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     bjorn.andersson@...aro.org
Cc:     ohad@...ery.com, linux-remoteproc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-arm-msm-owner@...r.kernel.org,
        Sibi Sankar <sibis@...eaurora.org>
Subject: [PATCH] remoteproc: qcom: q6v5: Fix a race condition on fatal crash

Currently with GLINK_SSR enabled each fatal crash results in servicing
a crash from wdog as well. This is due to a race that occurs in setting
the running flag in the shutdown path. Fix this by moving the running
flag to the end of fatal interrupt handler.

Crash Logs:
qcom-q6v5-pil 4080000.remoteproc: fatal error without message
remoteproc remoteproc0: crash detected in 4080000.remoteproc: type fatal
	error
remoteproc remoteproc0: handling crash #1 in 4080000.remoteproc
remoteproc remoteproc0: recovering 4080000.remoteproc
qcom-q6v5-pil 4080000.remoteproc: watchdog without message
remoteproc remoteproc0: crash detected in 4080000.remoteproc: type watchdog
remoteproc:glink-edge: intent request timed out
qcom_glink_ssr remoteproc:glink-edge.glink_ssr.-1.-1: failed to send
	cleanup message
qcom_glink_ssr remoteproc:glink-edge.glink_ssr.-1.-1: timeout waiting
	for cleanup done message
qcom-q6v5-pil 4080000.remoteproc: timed out on wait
qcom-q6v5-pil 4080000.remoteproc: port failed halt
remoteproc remoteproc0: stopped remote processor 4080000.remoteproc
qcom-q6v5-pil 4080000.remoteproc: MBA booted, loading mpss
remoteproc remoteproc0: remote processor 4080000.remoteproc is now up
remoteproc remoteproc0: handling crash #2 in 4080000.remoteproc
remoteproc remoteproc0: recovering 4080000.remoteproc
qcom-q6v5-pil 4080000.remoteproc: port failed halt
remoteproc remoteproc0: stopped remote processor 4080000.remoteproc
qcom-q6v5-pil 4080000.remoteproc: MBA booted, loading mpss
remoteproc remoteproc0: remote processor 4080000.remoteproc is now up

[bjorn: move running flag to the end of fatal interrupt handler]
Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
---
 drivers/remoteproc/qcom_q6v5.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/remoteproc/qcom_q6v5.c b/drivers/remoteproc/qcom_q6v5.c
index e9ab90c19304..edeb2e43209e 100644
--- a/drivers/remoteproc/qcom_q6v5.c
+++ b/drivers/remoteproc/qcom_q6v5.c
@@ -84,6 +84,7 @@ static irqreturn_t q6v5_fatal_interrupt(int irq, void *data)
 	else
 		dev_err(q6v5->dev, "fatal error without message\n");
 
+	q6v5->running = false;
 	rproc_report_crash(q6v5->rproc, RPROC_FATAL_ERROR);
 
 	return IRQ_HANDLED;
@@ -150,8 +151,6 @@ int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5)
 {
 	int ret;
 
-	q6v5->running = false;
-
 	qcom_smem_state_update_bits(q6v5->state,
 				    BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
 
-- 
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