linux-kernel - Re: [PATCH] ipmi: Cleanup oops on initialization failure

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Date:   Wed, 20 Jun 2018 17:26:49 +0300 (EEST)
From:   Meelis Roos <mroos@...ux.ee>
To:     minyard@....org
cc:     Linux Kernel list <linux-kernel@...r.kernel.org>,
        openipmi-developer@...ts.sourceforge.net,
        Corey Minyard <cminyard@...sta.com>
Subject: Re: [PATCH] ipmi: Cleanup oops on initialization failure

> Commit 93c303d2045b3 "ipmi_si: Clean up shutdown a bit" didn't
> copy the behavior of the cleanup in one spot, it needed to
> check for a non-NULL interface before cleaning it up.
> 
> Signed-off-by: Corey Minyard <cminyard@...sta.com>

Tested-by: Meelis Roos <mroos@...ux.ee>


The corresponding dmesg:

[    7.372830] IPMI System Interface driver.
[    7.373034] ipmi_si dmi-ipmi-si.0: ipmi_platform: probing via SMBIOS
[    7.373109] ipmi_si: SMBIOS: mem 0x0 regsize 1 spacing 1 irq 0
[    7.373182] ipmi_si: Adding SMBIOS-specified kcs state machine
[    7.373352] ipmi_si: Trying SMBIOS-specified kcs state machine at mem address 0x0, slave address 0x20, irq 0
[    7.373479] ipmi_si dmi-ipmi-si.0: Could not set up I/O space

> BTW, can you send me at least the IPMI portion of the output of
> dmidecode for your machine?  I have seen a lot of these where the
> address in the SMBIOS tables is incorrect, and I'm wondering if
> it's something in the driver, or if it's really the tables that
> are bad.

Handle 0x001B, DMI type 38, 18 bytes
IPMI Device Information
        Interface Type: KCS (Keyboard Control Style)
        Specification Version: 2.0
        I2C Slave Address: 0x10
        NV Storage Device: Not Present
        Base Address: 0x0000000000000000 (Memory-mapped)
        Register Spacing: Successive Byte Boundaries

> 
> Thanks for reporting this.  On your tested-by I'll send this up
> to Linus.
> 
> -corey
> 
>  drivers/char/ipmi/ipmi_si_intf.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
> index 3d0add6..a5987f8 100644
> --- a/drivers/char/ipmi/ipmi_si_intf.c
> +++ b/drivers/char/ipmi/ipmi_si_intf.c
> @@ -2088,8 +2088,10 @@ static int try_smi_init(struct smi_info *new_smi)
>  	return 0;
>  
>  out_err:
> -	ipmi_unregister_smi(new_smi->intf);
> -	new_smi->intf = NULL;
> +	if (new_smi->intf) {
> +		ipmi_unregister_smi(new_smi->intf);
> +		new_smi->intf = NULL;
> +	}
>  
>  	kfree(init_name);
>  
> 

-- 
Meelis Roos (mroos@...ux.ee)