This is a note to let you know that I've just added the patch titled
mei: vsc: Call wake_up() in the threaded IRQ handler
to the 6.8-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mei-vsc-call-wake_up-in-the-threaded-irq-handler.patch
and it can be found in the queue-6.8 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1ee94631f68f1829bf3dc3cae978870d81cce308
Author: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
Date: Mon Feb 19 21:58:05 2024 +0200
mei: vsc: Call wake_up() in the threaded IRQ handler
[ Upstream commit 058a38acba15fd8e7b262ec6e17c4204cb15f984 ]
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@xxxxxxxxxxxxxxx>
Tested-and-Reviewed-by: Wentong Wu <wentong.wu@xxxxxxxxx>
Link: https://lore.kernel.org/r/20240219195807.517742-2-sakari.ailus@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/misc/mei/vsc-tp.c b/drivers/misc/mei/vsc-tp.c
index 55f7db490d3bb..0e623700c3b0e 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);
