linux-kernel - Re: [PATCH v2] ata: pata_marvell: Check the 'bmdma

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Date:   Fri, 22 Apr 2022 09:50:24 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Cc:     Sergey Shtylyov <s.shtylyov@....ru>, linux-ide@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] ata: pata_marvell: Check the 'bmdma_addr' beforing reading

On Fri, Apr 22, 2022 at 7:48 AM Damien Le Moal
<damien.lemoal@...nsource.wdc.com> wrote:
>
> On 4/21/22 10:39, Zheyu Ma wrote:
> > Before detecting the cable type on the dma bar, the driver should check
> > whether the 'bmdma_addr' is zero, which means the adapter does not
> > support DMA, otherwise we will get the following error:
> >
> > [    5.146634] Bad IO access at port 0x1 (return inb(port))
> > [    5.147206] WARNING: CPU: 2 PID: 303 at lib/iomap.c:44 ioread8+0x4a/0x60
> > [    5.150856] RIP: 0010:ioread8+0x4a/0x60
> > [    5.160238] Call Trace:
> > [    5.160470]  <TASK>
> > [    5.160674]  marvell_cable_detect+0x6e/0xc0 [pata_marvell]
> > [    5.161728]  ata_eh_recover+0x3520/0x6cc0
> > [    5.168075]  ata_do_eh+0x49/0x3c0
> >
> > Signed-off-by: Zheyu Ma <zheyuma97@...il.com>
> > ---Changes in v2:
> >      - Delete the useless 'else'
>
> Note for future contributions: The change log should be placed *after*
> the "---" that comes before the "diff" line below. Otherwise, the change
> log pollutes the commit message.

Thank you for the reminder, I'll pay attention to this problem next time!

Zheyu Ma