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dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=mojha@codeaurora.org Subject: Re: [PATCH] genirq: Fix uninitialized request_mutex To: Kefeng Wang , Thomas Gleixner , Marc Zyngier , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org References: <20190404074512.145533-1-wangkefeng.wang@huawei.com> From: Mukesh Ojha Message-ID: Date: Thu, 4 Apr 2019 13:29:29 +0530 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190404074512.145533-1-wangkefeng.wang@huawei.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190404_005936_157665_D372926C X-CRM114-Status: GOOD ( 14.93 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 4/4/2019 1:15 PM, Kefeng Wang wrote: > When !CONFIG_SPARSE_IRQ, request_mutex of struct irq_desc won't > be initialiezed, it leads to system hung, fix it. > > Fixes: 9114014cf4e6 ("genirq: Add mutex to irq desc to serialize request/free_irq()") > Signed-off-by: Kefeng Wang Reviewed-by: Mukesh Ojha Cheers, -Mukesh > --- > kernel/irq/irqdesc.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/kernel/irq/irqdesc.c b/kernel/irq/irqdesc.c > index 13539e12cd80..9f8a709337cf 100644 > --- a/kernel/irq/irqdesc.c > +++ b/kernel/irq/irqdesc.c > @@ -558,6 +558,7 @@ 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(); 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