linux-kernel - Re: [PATCH 1/3] ipmi: Reset response handler when failing to send the command

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Message-ID: <20200908000326.GB15602@minyard.net>
Date:   Mon, 7 Sep 2020 19:03:26 -0500
From:   Corey Minyard <minyard@....org>
To:     Markus Boehme <markubo@...zon.com>
Cc:     openipmi-developer@...ts.sourceforge.net,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, Stefan Nuernberger <snu@...zon.com>,
        SeongJae Park <sjpark@...zon.com>, Amit Shah <aams@...zon.com>
Subject: Re: [PATCH 1/3] ipmi: Reset response handler when failing to send
 the command

On Mon, Sep 07, 2020 at 06:25:35PM +0200, Markus Boehme wrote:
> When failing to send a command we don't expect a response. Clear the
> `null_user_handler` like is done in the success path.

This is correct.  I guess, from the next two patches, I know how you
found this.

I can incude this, but I will ask some questions in the later patches.

-corey

> 
> Signed-off-by: Markus Boehme <markubo@...zon.com>
> ---
>  drivers/char/ipmi/ipmi_msghandler.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
> index 737c0b6..2b213c9 100644
> --- a/drivers/char/ipmi/ipmi_msghandler.c
> +++ b/drivers/char/ipmi/ipmi_msghandler.c
> @@ -2433,7 +2433,7 @@ static int __get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc)
>  
>  	rv = send_get_device_id_cmd(intf);
>  	if (rv)
> -		return rv;
> +		goto out_reset_handler;
>  
>  	wait_event(intf->waitq, bmc->dyn_id_set != 2);
>  
> @@ -2443,6 +2443,7 @@ static int __get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc)
>  	/* dyn_id_set makes the id data available. */
>  	smp_rmb();
>  
> +out_reset_handler:
>  	intf->null_user_handler = NULL;
>  
>  	return rv;
> @@ -3329,6 +3330,7 @@ static int __scan_channels(struct ipmi_smi *intf, struct ipmi_device_id *id)
>  			dev_warn(intf->si_dev,
>  				 "Error sending channel information for channel 0, %d\n",
>  				 rv);
> +			intf->null_user_handler = NULL;
>  			return -EIO;
>  		}
>  
> -- 
> 2.7.4
>