linux-kernel - Re: [PATCH] libata: Use per port sync for detach

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Message-ID: <91334913-eac8-c8e0-ced6-f1bb8d8b2507@huawei.com>
Date:   Mon, 18 May 2020 10:06:34 +0100
From:   John Garry <john.garry@...wei.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
CC:     Jens Axboe <axboe@...nel.dk>,
        "open list:LIBATA SUBSYSTEM (Serial and Parallel ATA drivers)" 
        <linux-ide@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] libata: Use per port sync for detach

On 15/05/2020 18:48, Kai-Heng Feng wrote:
>> 841]  ret_from_fork+0x10/0x1c
>> [   28.393400] ---[ end trace 9972785c7052048f ]---
>> [   28.435826] ahci 0000:b4:03.0: SSS flag set, parallel bus scan disabled
> Can you please test the following patch:
> 
> diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
> index 474c6c34fe02..51ee0cc4d414 100644
> --- a/drivers/ata/libata-eh.c
> +++ b/drivers/ata/libata-eh.c
> @@ -3583,8 +3583,10 @@ int ata_eh_recover(struct ata_port *ap, ata_prereset_fn_t prereset,
>          rc = 0;
>   
>          /* if UNLOADING, finish immediately */
> -       if (ap->pflags & ATA_PFLAG_UNLOADING)
> +       if (ap->pflags & ATA_PFLAG_UNLOADING) {
> +               ap->pflags |= ATA_PFLAG_UNLOADED;
>                  goto out;
> +       }
> 
> It's only compile-tested, many drivers panic with CONFIG_DEBUG_TEST_DRIVER_REMOVE enabled, so the system I have can't even boot properly:(

ok, let me debug this today.

Thanks,
John