Re: [PATCH v2] ata: pata_marvell: Check the 'bmdma_addr' beforing reading

[Damien Le Moal <damien.lemoal@opensource.wdc.com>]

On 4/22/22 08:47, Damien Le Moal 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@gmail.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.
> 
> I fixed that and applied to for-5.18-fixes. Thanks.

I completely overlooked that this needs a CC stable...

Greg,

Could you please pickup this commit for stable ?
In Linus tree/rc4, it is:

aafa9f958342 ("ata: pata_marvell: Check the 'bmdma_addr' beforing reading")

Thanks !

> 
>> ---
>>   drivers/ata/pata_marvell.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/drivers/ata/pata_marvell.c b/drivers/ata/pata_marvell.c
>> index 0c5a51970fbf..014ccb0f45dc 100644
>> --- a/drivers/ata/pata_marvell.c
>> +++ b/drivers/ata/pata_marvell.c
>> @@ -77,6 +77,8 @@ static int marvell_cable_detect(struct ata_port *ap)
>>   	switch(ap->port_no)
>>   	{
>>   	case 0:
>> +		if (!ap->ioaddr.bmdma_addr)
>> +			return ATA_CBL_PATA_UNK;
>>   		if (ioread8(ap->ioaddr.bmdma_addr + 1) & 1)
>>   			return ATA_CBL_PATA40;
>>   		return ATA_CBL_PATA80;
> 
> 


-- 
Damien Le Moal
Western Digital Research