linux-kernel - Re: [RFC PATCH 02/57] drivers: ipmi: Drop device reference

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Message-ID: <20190603190921.GC6487@kroah.com>
Date:   Mon, 3 Jun 2019 21:09:21 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Suzuki K Poulose <suzuki.poulose@....com>
Cc:     linux-kernel@...r.kernel.org, rafael@...nel.org,
        Corey Minyard <minyard@....org>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [RFC PATCH 02/57] drivers: ipmi: Drop device reference

On Mon, Jun 03, 2019 at 04:49:28PM +0100, Suzuki K Poulose wrote:
> Drop the reference to a device found via bus_find_device()
> 
> Cc: Corey Minyard <minyard@....org>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
> ---
>  drivers/char/ipmi/ipmi_si_platform.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/char/ipmi/ipmi_si_platform.c b/drivers/char/ipmi/ipmi_si_platform.c
> index f2a91c4..ff82353 100644
> --- a/drivers/char/ipmi/ipmi_si_platform.c
> +++ b/drivers/char/ipmi/ipmi_si_platform.c
> @@ -442,6 +442,7 @@ void ipmi_remove_platform_device_by_name(char *name)
>  				      pdev_match_name))) {
>  		struct platform_device *pdev = to_platform_device(dev);
>  
> +		put_device(dev);
>  		platform_device_unregister(pdev);

So you drop the reference, and then actually use the pointer?

The drop needs to be _after_ the call to platform_device_unregister().

thanks,

greg k-h