[PATCH 4.9 128/240] ata: libahci_platform: fix IRQ check

Greg Kroah-Hartman
2021-05-20T11:14:57Z

From: Sergey Shtylyov <s.shtylyov@omprussia.ru>

[ Upstream commit b30d0040f06159de97ad9c0b1536f47250719d7d ]

Iff platform_get_irq() returns 0, ahci_platform_init_host() would return 0
early (as if the call was successful). Override IRQ0 with -EINVAL instead
as the 'libata' regards 0 as "no IRQ" (thus polling) anyway...

Fixes: c034640a32f8 ("ata: libahci: properly propagate return value of platform_get_irq()")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Link: https://lore.kernel.org/r/4448c8cc-331f-2915-0e17-38ea34e251c8@omprussia.ru
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/ata/libahci_platform.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 0b80502bc1c5..bfa2e5eec263 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -518,11 +518,13 @@ int ahci_platform_init_host(struct platform_device *pdev,
int i, irq, n_ports, rc;

irq = platform_get_irq(pdev, 0);
- if (irq <= 0) {
+ if (irq < 0) {
if (irq != -EPROBE_DEFER)
dev_err(dev, "no irq\n");
return irq;
}
+ if (!irq)
+ return -EINVAL;

hpriv->irq = irq;

--
2.30.2