linux-kernel - Re: [5.3.0-rc4-next][bisected 882632][qla2xxx] WARNING: CPU: 10 PID: 425 at drivers/scsi/qla2xxx/qla_isr.c:2784 qla2x00_status

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Date:   Mon, 19 Aug 2019 15:56:50 +0530
From:   Abdul Haleem <abdhalee@...ux.vnet.ibm.com>
To:     Bart Van Assche <bvanassche@....org>
Cc:     linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-next <linux-next@...r.kernel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        linux-scsi <linux-scsi@...r.kernel.org>,
        martin.petersen@...cle.com, hmadhani@...vell.com,
        sachinp <sachinp@...ux.vnet.ibm.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        manvanth <manvanth@...ux.vnet.ibm.com>
Subject: Re: [5.3.0-rc4-next][bisected 882632][qla2xxx] WARNING: CPU: 10
 PID: 425 at drivers/scsi/qla2xxx/qla_isr.c:2784 qla2x00_status_entry.isra

On Wed, 2019-08-14 at 20:42 -0700, Bart Van Assche wrote:
> On 8/14/19 10:18 AM, Abdul Haleem wrote:
> > On Wed, 2019-08-14 at 10:05 -0700, Bart Van Assche wrote:
> >> On 8/14/19 9:52 AM, Abdul Haleem wrote:
> >>> Greeting's
> >>>
> >>> Today's linux-next kernel (5.3.0-rc4-next-20190813)  booted with warning on my powerpc power 8 lpar
> >>>
> >>> The WARN_ON_ONCE() was introduced by commit 88263208 (scsi: qla2xxx: Complain if sp->done() is not...)
> >>>
> >>> boot logs:
> >>>
> >>> WARNING: CPU: 10 PID: 425 at drivers/scsi/qla2xxx/qla_isr.c:2784
> >>
> >> Hi Abdul,
> >>
> >> Thank you for having reported this. Is that the only warning reported on your setup by the qla2xxx
> >> driver? If that warning is commented out, does the qla2xxx driver work as expected?
> > 
> > boot warning did not show up when the commit is reverted.
> > 
> > should I comment out only the WARN_ON_ONCE() which is causing the issue,
> > and not the other one ?
> 
> Yes please. Commit 88263208 introduced five kernel warnings but I think 
> only one of these should be removed again, e.g. as follows:
> 
> diff --git a/drivers/scsi/qla2xxx/qla_isr.c b/drivers/scsi/qla2xxx/qla_isr.c
> index cd39ac18c5fd..d81b5ecce24b 100644
> --- a/drivers/scsi/qla2xxx/qla_isr.c
> +++ b/drivers/scsi/qla2xxx/qla_isr.c
> @@ -2780,8 +2780,6 @@ qla2x00_status_entry(scsi_qla_host_t *vha, struct 
> rsp_que *rsp, void *pkt)
> 
>   	if (rsp->status_srb == NULL)
>   		sp->done(sp, res);
> -	else
> -		WARN_ON_ONCE(true);
>   }
> 
>   /**
 
Applying above patch on system boots fine.

i.e no warnings pop up when keeping all WARN_ON_ONCE() except above one.

Reported-and-Tested-by: Abdul Haleem <abdhalee@...ux.vnet.ibm.com>

-- 
Regard's

Abdul Haleem
IBM Linux Technology Centre