linux-kernel - Re: [PATCH 08/15] hisi_sas: fix a potential warning for sata disk ejection

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Date:   Wed, 14 Sep 2016 14:48:14 +0200
From:   Hannes Reinecke <hare@...e.de>
To:     John Garry <john.garry@...wei.com>, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com
Cc:     linuxarm@...wei.com, zhangfei.gao@...aro.org, xuwei5@...ilicon.com,
        john.garry2@...l.dcu.ie, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Xiang Chen <chenxiang66@...ilicon.com>
Subject: Re: [PATCH 08/15] hisi_sas: fix a potential warning for sata disk
 ejection

On 09/06/2016 05:36 PM, John Garry wrote:
> If hisi_sas_task_prep() fails for a SATA device due to PHY
> down, we return a failure to libata and also call task_done(),
> which will cause ata_qc_complete() to be called twice:
> - first call from hisi_sas_task_prep(), which will clear flag
>   ATA_QCFLAG_ACTIVE
> - ata_qc_complete() called from libata
> The warning call trace is as follows:
> 
> [  117.070206] [<ffff0000084f59b0>] __ata_qc_complete+0xf4/0x11c
> [  117.070208] [<ffff0000084f5b58>] ata_qc_complete+0x180/0x200
> [  117.070210] [<ffff0000084f5dd0>] ata_qc_issue+0x110/0x354
> [  117.070212] [<ffff0000084f6254>] ata_exec_internal_sg+0x240/0x4d0
> [  117.070214] [<ffff0000084f6544>] ata_exec_internal+0x60/0xa0
> [  117.070217] [<ffff000008501580>] ata_read_log_page+0x188/0x1b4
> [  117.070218] [<ffff0000085017dc>] ata_eh_analyze_ncq_error+0xa8/0x274
> [  117.070220] [<ffff000008501a3c>] ata_eh_link_autopsy+0x94/0x8c8
> [  117.070222] [<ffff0000085022a4>] ata_eh_autopsy+0x34/0xe8
> [  117.070223] [<ffff00000850540c>] ata_do_eh+0x28/0xc0
> [  117.070225] [<ffff0000085054e0>] ata_std_error_handler+0x3c/0x84
> [  117.070227] [<ffff000008505140>] ata_scsi_port_error_handler+0x480/0x674
> [  117.070230] [<ffff0000084e3020>] async_sas_ata_eh+0x44/0x78
> [  117.070231] [<ffff0000080d6b8c>] async_run_entry_fn+0x40/0x104
> [  117.070234] [<ffff0000080ce518>] process_one_work+0x128/0x2f0
> [  117.070235] [<ffff0000080ce738>] worker_thread+0x58/0x434
> [  117.070237] [<ffff0000080d416c>] kthread+0xd4/0xe8
> [  117.070240] [<ffff000008084e10>] ret_from_fork+0x10/0x40
> 
> The issue is resolved by simply returning a failure status
> code to the upper layer.
> 
> Signed-off-by: Xiang Chen <chenxiang66@...ilicon.com>
> Signed-off-by: John Garry <john.garry@...wei.com>
> ---
>  drivers/scsi/hisi_sas/hisi_sas_main.c | 26 ++++++--------------------
>  1 file changed, 6 insertions(+), 20 deletions(-)
> 
Reviewed-by: Hannes Reinecke <hare@...e.com>

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare@...e.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)