linux-kernel - Re: [PATCH] mailbox: qcom-ipcc: Enable loading QCOM

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Date:   Fri, 16 Jul 2021 14:53:50 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Amit Pundir <amit.pundir@...aro.org>
Cc:     Jassi Brar <jassisinghbrar@...il.com>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mailbox: qcom-ipcc: Enable loading QCOM_IPCC as a module

On Fri, Jul 16, 2021 at 01:19:46PM +0530, Amit Pundir wrote:
> This patch enables the qcom_ipcc driver to be loaded as a
> module. IPCC is fairly core to system, so as such it should
> never be unloaded. It registers as a mailbox + irq controller
> and the irq controller drivers in kernel are not supposed to
> be unloaded as they don't have the visibility over the clients
> consuming the irqs. Hence adding supress_bind_attrs to disable
> bind/unbind via sysfs.
> 
> Signed-off-by: Amit Pundir <amit.pundir@...aro.org>

Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>

Thanks,
Mani

> ---
>  drivers/mailbox/Kconfig     | 2 +-
>  drivers/mailbox/qcom-ipcc.c | 1 +
>  2 files changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mailbox/Kconfig b/drivers/mailbox/Kconfig
> index b4b780ea2ac8..c9fc06c7e685 100644
> --- a/drivers/mailbox/Kconfig
> +++ b/drivers/mailbox/Kconfig
> @@ -264,7 +264,7 @@ config SPRD_MBOX
>  	  you want to build the Spreatrum mailbox controller driver.
>  
>  config QCOM_IPCC
> -	bool "Qualcomm Technologies, Inc. IPCC driver"
> +	tristate "Qualcomm Technologies, Inc. IPCC driver"
>  	depends on ARCH_QCOM || COMPILE_TEST
>  	help
>  	  Qualcomm Technologies, Inc. Inter-Processor Communication Controller
> diff --git a/drivers/mailbox/qcom-ipcc.c b/drivers/mailbox/qcom-ipcc.c
> index 584700cd1585..f1d4f4679b17 100644
> --- a/drivers/mailbox/qcom-ipcc.c
> +++ b/drivers/mailbox/qcom-ipcc.c
> @@ -277,6 +277,7 @@ static struct platform_driver qcom_ipcc_driver = {
>  	.driver = {
>  		.name = "qcom-ipcc",
>  		.of_match_table = qcom_ipcc_of_match,
> +		.suppress_bind_attrs = true,
>  	},
>  };
>  
> -- 
> 2.25.1
>