netdev - Re: [patch v2] qlcnic: fix a timeout loop

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Date:	Mon, 4 Jan 2016 14:19:57 +0100
From:	Yann Dupont - Veille Techno <veilletechno-irts@...v-nantes.fr>
To:	Dan Carpenter <dan.carpenter@...cle.com>,
	Dept-GELinuxNICDev@...gic.com,
	Manish Chopra <manish.chopra@...gic.com>
Cc:	netdev@...r.kernel.org,
	Rajesh Borundia <rajesh.borundia@...gic.com>
Subject: Re: [patch v2] qlcnic: fix a timeout loop

Le 15/12/2015 14:56, Dan Carpenter a écrit :
> The problem here is that at the end of the loop we test for if
> idc->vnic_wait_limit is zero, but since idc->vnic_wait_limit-- is a
> post-op, it actually ends up set to (u8)-1.  I have fixed this by
> moving the decrement inside the loop.
>
> Fixes: 486a5bc77a4a ('qlcnic: Add support for 83xx suspend and resume.')
> Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
> ---
> v2: different color on the bikeshed
>
> diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_vnic.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_vnic.c
> index be7d7a6..b1a452f 100644
> --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_vnic.c
> +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_83xx_vnic.c
> @@ -246,7 +246,8 @@ int qlcnic_83xx_check_vnic_state(struct qlcnic_adapter *adapter)
>   	u32 state;
>   
>   	state = QLCRDX(ahw, QLC_83XX_VNIC_STATE);
> -	while (state != QLCNIC_DEV_NPAR_OPER && idc->vnic_wait_limit--) {
> +	while (state != QLCNIC_DEV_NPAR_OPER && idc->vnic_wait_limit) {
> +		idc->vnic_wait_limit--;
>   		msleep(1000);
>   		state = QLCRDX(ahw, QLC_83XX_VNIC_STATE);
>   	}
> --
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Hi everybody, & Happy new year.

We're seeing very sporadic & rare kernel oops due to qlcnic, even with 
latests kernels.
I only have 1 trace, which can be seen here https://paste2.org/4m8EGEG1

Others kernel oops (not recorded) showed different stack trace, but in 
the end, problem was always in qlcnic_xmit_frame


Any chance this bug is corrected by this very patch or is this a totally 
different problem ?

Cheers,
Yann.

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