Patch "genirq: Initialize request_mutex if CONFIG_SPARSE_IRQ=n" has been added to the 4.19-stable tree

Patch "genirq: Initialize request_mutex if CONFIG_SPARSE_IRQ=n" has been added to the 4.19-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    genirq: Initialize request_mutex if CONFIG_SPARSE_IRQ=n

to the 4.19-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:
     genirq-initialize-request_mutex-if-config_sparse_irq-n.patch
and it can be found in the queue-4.19 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


From e8458e7afa855317b14915d7b86ab3caceea7eb6 Mon Sep 17 00:00:00 2001
From: Kefeng Wang <wangkefeng.wang@huawei.com>
Date: Thu, 4 Apr 2019 15:45:12 +0800
Subject: genirq: Initialize request_mutex if CONFIG_SPARSE_IRQ=n

From: Kefeng Wang <wangkefeng.wang@huawei.com>

commit e8458e7afa855317b14915d7b86ab3caceea7eb6 upstream.

When CONFIG_SPARSE_IRQ is disable, the request_mutex in struct irq_desc
is not initialized which causes malfunction.

Fixes: 9114014cf4e6 ("genirq: Add mutex to irq desc to serialize request/free_irq()")
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: <linux-arm-kernel@lists.infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20190404074512.145533-1-wangkefeng.wang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/irq/irqdesc.c |    1 +
 1 file changed, 1 insertion(+)

--- a/kernel/irq/irqdesc.c
+++ b/kernel/irq/irqdesc.c
@@ -554,6 +554,7 @@ int __init early_irq_init(void)
 		alloc_masks(&desc[i], node);
 		raw_spin_lock_init(&desc[i].lock);
 		lockdep_set_class(&desc[i].lock, &irq_desc_lock_class);
+		mutex_init(&desc[i].request_mutex);
 		desc_set_defaults(i, &desc[i], node, NULL, NULL);
 	}
 	return arch_early_irq_init();


Patches currently in stable-queue which might be from wangkefeng.wang@huawei.com are

queue-4.19/genirq-initialize-request_mutex-if-config_sparse_irq-n.patch

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