linux-kernel - re: irqchip: Add IMX MU MSI controller driver

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Message-ID: <e5992130-ce33-9377-e3f3-9bfdb240f9b8@gmail.com>
Date:   Tue, 4 Oct 2022 20:37:46 +0100
From:   "Colin King (gmail)" <colin.i.king@...il.com>
To:     Frank Li <Frank.Li@....com>, Marc Zyngier <maz@...nel.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: re: irqchip: Add IMX MU MSI controller driver

Hi,

Static analysis with clang scan-build detected an issue with the 
following commit in linux-next:

commit 70afdab904d2d1e68bffe75fe08e7e48e0b0ff8e
Author: Frank Li <Frank.Li@....com>
Date:   Thu Sep 22 11:12:43 2022 -0500

     irqchip: Add IMX MU MSI controller driver

The issue is as follows in source drivers/irqchip/irq-imx-mu-msi.c :


static const struct imx_mu_dcfg imx_mu_cfg_imx8ulp = {
         .type   = IMX_MU_V2,
         .xTR    = 0x200,
         .xRR    = 0x280,
         .xSR    = {
                         [IMX_MU_SR]  = 0xC,
                         [IMX_MU_GSR] = 0x118,
                         [IMX_MU_GSR] = 0x124,    /* <--- issue here */
                         [IMX_MU_RSR] = 0x12C,
                   },
         .xCR    = {
                         [IMX_MU_GIER] = 0x110,
                         [IMX_MU_GCR]  = 0x114,
                         [IMX_MU_TCR]  = 0x120,
                         [IMX_MU_RCR]  = 0x128
                   },
};

The .xSR object with index  IMX_MU_GSR is being set twice, once with 
0x118 and again with 0x128. I believe the first one should be IMX_MU_TSR 
but w/o the datasheet I don't want to make any assumptions.



Colin