linux-kernel - [PATCH v2 1/3] mei: vsc: Call wake_up() in the threaded IRQ handler

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Date: Mon, 19 Feb 2024 21:58:05 +0200
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: Hans de Goede <hdegoede@...hat.com>,
	Tomas Winkler <tomas.winkler@...el.com>,
	Wentong Wu <wentong.wu@...el.com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH v2 1/3] mei: vsc: Call wake_up() in the threaded IRQ handler

The hard IRQ handler vsc_tp_irq() is called with a raw spinlock taken.
wake_up() acquires a spinlock, a sleeping lock on PREEMPT_RT. This leads
to sleeping in atomic context.

Move the wake_up() call to the threaded IRQ handler vsc_tp_thread_isr()
where it can be safely called.

Fixes: 566f5ca97680 ("mei: Add transport driver for IVSC device")
Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
---
 drivers/misc/mei/vsc-tp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/mei/vsc-tp.c b/drivers/misc/mei/vsc-tp.c
index 6f4a4be6ccb5..2b69ada9349e 100644
--- a/drivers/misc/mei/vsc-tp.c
+++ b/drivers/misc/mei/vsc-tp.c
@@ -416,8 +416,6 @@ static irqreturn_t vsc_tp_isr(int irq, void *data)
 
 	atomic_inc(&tp->assert_cnt);
 
-	wake_up(&tp->xfer_wait);
-
 	return IRQ_WAKE_THREAD;
 }
 
@@ -425,6 +423,8 @@ static irqreturn_t vsc_tp_thread_isr(int irq, void *data)
 {
 	struct vsc_tp *tp = data;
 
+	wake_up(&tp->xfer_wait);
+
 	if (tp->event_notify)
 		tp->event_notify(tp->event_notify_context);
 
-- 
2.39.2