linux-kernel - [PATCH 05/10] mei: vsc: Destroy mutex after freeing the IRQ

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Message-ID: <20250623085052.12347-6-hansg@kernel.org>
Date: Mon, 23 Jun 2025 10:50:47 +0200
From: Hans de Goede <hansg@...nel.org>
To: Sakari Ailus <sakari.ailus@...ux.intel.com>,
	Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>,
	Alexander Usyskin <alexander.usyskin@...el.com>
Cc: Hans de Goede <hansg@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 05/10] mei: vsc: Destroy mutex after freeing the IRQ

The event_notify callback which runs from vsc_tp_thread_isr may call
vsc_tp_xfer() which locks the mutex. So the ISR depends on the mutex.

Move the mutex_destroy() call to after free_irq() to ensure that the ISR
is not running while the mutex is destroyed.

Fixes: 566f5ca97680 ("mei: Add transport driver for IVSC device")
Signed-off-by: Hans de Goede <hansg@...nel.org>
---
 drivers/misc/mei/vsc-tp.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/mei/vsc-tp.c b/drivers/misc/mei/vsc-tp.c
index f5438a600430..0feebffabdb3 100644
--- a/drivers/misc/mei/vsc-tp.c
+++ b/drivers/misc/mei/vsc-tp.c
@@ -521,10 +521,10 @@ static int vsc_tp_probe(struct spi_device *spi)
 	return 0;
 
 err_destroy_lock:
-	mutex_destroy(&tp->mutex);
-
 	free_irq(spi->irq, tp);
 
+	mutex_destroy(&tp->mutex);
+
 	return ret;
 }
 
@@ -535,9 +535,9 @@ static void vsc_tp_remove(struct spi_device *spi)
 
 	platform_device_unregister(tp->pdev);
 
-	mutex_destroy(&tp->mutex);
-
 	free_irq(spi->irq, tp);
+
+	mutex_destroy(&tp->mutex);
 }
 
 static const struct acpi_device_id vsc_tp_acpi_ids[] = {
-- 
2.49.0