Re: [PATCH v2 2/2] ata: libata-sff: refactor ata_sff_altstatus()

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

On 2/18/22 01:02, Sergey Shtylyov wrote:
> On 2/17/22 3:12 PM, Dan Carpenter wrote:
> 
>> url:    https://github.com/0day-ci/linux/commits/Sergey-Shtylyov/Refactor-the-accessors-for-the-ATA-device-control-and-alternate-status-registers/20220213-231119
>> base:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git b81b1829e7e39f6cebdf6e4d5484eacbceda8554
>> config: riscv-randconfig-m031-20220213 (https://download.01.org/0day-ci/archive/20220214/202202141714.X7UdMJUj-lkp@intel.com/config)
>> compiler: riscv32-linux-gcc (GCC) 11.2.0
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@intel.com>
>> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
>>
>> smatch warnings:
>> drivers/ata/libata-sff.c:1652 ata_sff_lost_interrupt() error: uninitialized symbol 'status'.
>>
>> vim +/status +1652 drivers/ata/libata-sff.c
>>
>> c96f1732e25362 Alan Cox        2009-03-24  1635  void ata_sff_lost_interrupt(struct ata_port *ap)
>> c96f1732e25362 Alan Cox        2009-03-24  1636  {
>> c96f1732e25362 Alan Cox        2009-03-24  1637  	u8 status;
>> c96f1732e25362 Alan Cox        2009-03-24  1638  	struct ata_queued_cmd *qc;
>> c96f1732e25362 Alan Cox        2009-03-24  1639  
>> c96f1732e25362 Alan Cox        2009-03-24  1640  	/* Only one outstanding command per SFF channel */
>> c96f1732e25362 Alan Cox        2009-03-24  1641  	qc = ata_qc_from_tag(ap, ap->link.active_tag);
>> 3e4ec3443f70fb Tejun Heo       2010-05-10  1642  	/* We cannot lose an interrupt on a non-existent or polled command */
>> 3e4ec3443f70fb Tejun Heo       2010-05-10  1643  	if (!qc || qc->tf.flags & ATA_TFLAG_POLLING)
>> c96f1732e25362 Alan Cox        2009-03-24  1644  		return;
>> c96f1732e25362 Alan Cox        2009-03-24  1645  	/* See if the controller thinks it is still busy - if so the command
>> c96f1732e25362 Alan Cox        2009-03-24  1646  	   isn't a lost IRQ but is still in progress */
>> 57232468aca7de Sergey Shtylyov 2022-02-13  1647  	if (ata_sff_altstatus(ap, &status) && (status & ATA_BUSY))
>>
>> "status" is not intialized if ata_sff_altstatus() return false.
> 
>    Hmm, inaccurate coding on my side, will fix it, thanks!
> 
>> c96f1732e25362 Alan Cox        2009-03-24  1648  		return;
>> c96f1732e25362 Alan Cox        2009-03-24  1649  
>> c96f1732e25362 Alan Cox        2009-03-24  1650  	/* There was a command running, we are no longer busy and we have
>> c96f1732e25362 Alan Cox        2009-03-24  1651  	   no interrupt. */
>> a9a79dfec23956 Joe Perches     2011-04-15 @1652  	ata_port_warn(ap, "lost interrupt (Status 0x%x)\n",
>> c96f1732e25362 Alan Cox        2009-03-24  1653  								status);
>>                                                                                                                 ^^^^^^
>> Uninitalized.  Also the indenting is unfortunate.
> 
>    Not my fault but I'll fix this as well... :-)

Did you send a fix ? I did not see anything in my inbox...

> 
> [...]
> 
> MBR, Sergey


-- 
Damien Le Moal
Western Digital Research