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pata_arasan_cf: fix IRQ check 

The driver's probe() method is written as if platform_get_irq() returns 0
on error, while actually it returns a negative error code (with all the
other values considered valid IRQs). Rewrite the driver's IRQ checking code
to pass the positive IRQ #s to ata_host_activate(), propagate upstream
-EPROBE_DEFER, and set up the driver to polling mode on (negative) errors
and IRQ0 (libata treats IRQ #0 as a polling mode anyway)...

Fixes: a480167b23 ("pata_arasan_cf: Adding support for arasan compact flash host controller")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Sergey Shtylyov 2021-03-25 23:50:24 +03:00 committed by Jens Axboe
parent 2b0a9946bf
commit c7e8f404d5
1 changed files with 11 additions and 4 deletions
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15
drivers/ata/pata_arasan_cf.c
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@ -818,12 +818,19 @@ static int arasan_cf_probe(struct platform_device *pdev)
else
quirk = CF_BROKEN_UDMA; /* as it is on spear1340 */
/* if irq is 0, support only PIO */
acdev->irq = platform_get_irq(pdev, 0);
if (acdev->irq)
/*
* If there's an error getting IRQ (or we do get IRQ0),
* support only PIO
*/
ret = platform_get_irq(pdev, 0);
if (ret > 0) {
acdev->irq = ret;
irq_handler = arasan_cf_interrupt;
else
} else if (ret == -EPROBE_DEFER) {
return ret;
} else {
quirk |= CF_BROKEN_MWDMA | CF_BROKEN_UDMA;
}
acdev->pbase = res->start;
acdev->vbase = devm_ioremap(&pdev->dev, res->start,