linux-kernel - [PATCH] mbigen: don't clear eventid when free

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Date:   Sat, 16 Mar 2019 11:15:03 +0000
From:   chenjianguo <chenjianguo3@...wei.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>,
        "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: [PATCH] mbigen: don't clear eventid when free_irq

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);

--
1.8.5.6


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