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Date: Thu, 21 Mar 2019 09:11:35 +0000 From: Marc Zyngier <marc.zyngier@....com> To: chenjianguo <chenjianguo3@...wei.com> Cc: Thomas Gleixner <tglx@...utronix.de>, Jason Cooper <jason@...edaemon.net>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "Liyou (leeyou, RTOS)" <leeyou.li@...wei.com>, "Joey Yan(Bo)" <joey.yanbo@...wei.com>, "Xiaowei (C)" <xiaowei774@...wei.com>, "zhanghan (Q)" <zhanghan23@...wei.com>, Yangyingliang <yangyingliang@...wei.com>, yaohongbo <yaohongbo@...wei.com>, Linuxarm <linuxarm@...wei.com> Subject: Re: [PATCH] mbigen: don't clear eventid when free_irq On Sat, 16 Mar 2019 11:15:03 +0000 chenjianguo <chenjianguo3@...wei.com> wrote: > From: Jianguo Chen <chenjianguo3@...wei.com> > > mbigen_write_msg clears eventid bits of a mbigen register > when free a interrupt, because msi_domain_deactivate memset > struct msg to zero. Then multiple mbigen pins with zero eventid > will report the same interrupt number. > > The eventid clear call trace: > free_irq > __free_irq > irq_shutdown > irq_domain_deactivate_irq > __irq_domain_deactivate_irq > __irq_domain_deactivate_irq > msi_domain_deactivate > platform_msi_write_msg > mbigen_write_msg > > Signed-off-by: Jianguo Chen <chenjianguo3@...wei.com> > --- > drivers/irqchip/irq-mbigen.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c > index 567b29c..fad7291 100644 > --- a/drivers/irqchip/irq-mbigen.c > +++ b/drivers/irqchip/irq-mbigen.c > @@ -161,6 +161,9 @@ static void mbigen_write_msg(struct msi_desc *desc, > struct msi_msg *msg) > void __iomem *base = d->chip_data; > u32 val; > > + if (!msg->address_lo && !msg->address_hi) > + return; > + > base += get_mbigen_vec_reg(d->hwirq); > val = readl_relaxed(base); > For whatever reason, I couldn't apply this patch (even when fishing a copy of this email from the archives). It seems to be corrupted is various ways, so I had to write the patch from scratch, which is not the most reliable way to work. Good thing this was something trivial, I wouldn't do it for something more complicated. In the future, please make sure to use 'git send-email' to send your patches, as it is known to work correctly. Thanks, M. -- Without deviation from the norm, progress is not possible.
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