linux-kernel - [PATCH v3] firmware/arm_sdei: Fix invalid argument to unregister private events.

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Date: Thu, 18 Jan 2024 20:20:54 +0000
From: Levi Yun <ppbuk5246@...il.com>
To: james.morse@....com,
	pierre.gondois@....com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Levi Yun <ppbuk5246@...il.com>
Subject: [PATCH v3] firmware/arm_sdei: Fix invalid argument to unregister private events.

To unregister private events in device freeze, it should call
cpuhp_remove_state with sdei_hp_state not sdei_entry_point.
otherwise, it seems to fail on cpuhp_cb_check.

Signed-off-by: Levi Yun <ppbuk5246@...il.com>
Fixes: d2c48b2387eb ("firmware: arm_sdei: Fix sleep from invalid context BUG")
Reviewed-by: James Morse <james.morse@....com>
---
Changes:
    v1->v2: add fixes tag and resetting sdei_hp_state
   v2->v3: add missing resetting sdei_hp_state.

 drivers/firmware/arm_sdei.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/firmware/arm_sdei.c b/drivers/firmware/arm_sdei.c
index 285fe7ad490d..973972d50287 100644
--- a/drivers/firmware/arm_sdei.c
+++ b/drivers/firmware/arm_sdei.c
@@ -763,7 +763,9 @@ static int sdei_device_freeze(struct device *dev)
 	int err;

 	/* unregister private events */
-	cpuhp_remove_state(sdei_entry_point);
+	cpuhp_remove_state(sdei_hp_state);
+
+	sdei_hp_state = 0;

 	err = sdei_unregister_shared();
 	if (err)
--
2.41.0