1 files changed, 39 insertions, 0 deletions
diff --git a/debian/patches-rt/block_mq__do_not_invoke_preempt_disable.patch b/debian/patches-rt/block_mq__do_not_invoke_preempt_disable.patch
new file mode 100644
index 000000000..7a2b94bc5
--- /dev/null
+++ b/debian/patches-rt/block_mq__do_not_invoke_preempt_disable.patch
@@ -0,0 +1,39 @@
+Subject: block/mq: do not invoke preempt_disable()
+From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Date: Tue Jul 14 14:26:34 2015 +0200
+Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/5.15/older/patches-5.15.3-rt21.tar.xz
+
+From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+
+preempt_disable() and get_cpu() don't play well together with the sleeping
+locks it tries to allocate later.
+It seems to be enough to replace it with get_cpu_light() and migrate_disable().
+
+Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
+Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
+
+
+---
+ block/blk-mq.c |    6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+---
+--- a/block/blk-mq.c
++++ b/block/blk-mq.c
+@@ -1559,14 +1559,14 @@ static void __blk_mq_delay_run_hw_queue(
+ 		return;
+ 
+ 	if (!async && !(hctx->flags & BLK_MQ_F_BLOCKING)) {
+-		int cpu = get_cpu();
++		int cpu = get_cpu_light();
+ 		if (cpumask_test_cpu(cpu, hctx->cpumask)) {
+ 			__blk_mq_run_hw_queue(hctx);
+-			put_cpu();
++			put_cpu_light();
+ 			return;
+ 		}
+ 
+-		put_cpu();
++		put_cpu_light();
+ 	}
+ 
+ 	kblockd_mod_delayed_work_on(blk_mq_hctx_next_cpu(hctx), &hctx->run_work,