linux-kernel - [PATCH 4.14 079/315] pata_rb532

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Date:   Mon, 19 Jul 2021 16:49:28 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Sergey Shtylyov <s.shtylyov@...russia.ru>,
        Jens Axboe <axboe@...nel.dk>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.14 079/315] pata_rb532_cf: fix deferred probing

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

[ Upstream commit 2d3a62fbae8e5badc2342388f65ab2191c209cc0 ]

The driver overrides the error codes returned by platform_get_irq() to
-ENOENT, so if it returns -EPROBE_DEFER, the driver would fail the probe
permanently instead of the deferred probing. Switch to propagating the
error code upstream, still checking/overriding IRQ0 as libata regards it
as "no IRQ" (thus polling) anyway...

Fixes: 9ec36cafe43b ("of/irq: do irq resolution in platform_get_irq")
Signed-off-by: Sergey Shtylyov <s.shtylyov@...russia.ru>
Link: https://lore.kernel.org/r/771ced55-3efb-21f5-f21c-b99920aae611@omprussia.ru
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/ata/pata_rb532_cf.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/pata_rb532_cf.c b/drivers/ata/pata_rb532_cf.c
index 653b9a0bf727..0416a390b94c 100644
--- a/drivers/ata/pata_rb532_cf.c
+++ b/drivers/ata/pata_rb532_cf.c
@@ -120,10 +120,12 @@ static int rb532_pata_driver_probe(struct platform_device *pdev)
 	}
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0) {
+	if (irq < 0) {
 		dev_err(&pdev->dev, "no IRQ resource found\n");
-		return -ENOENT;
+		return irq;
 	}
+	if (!irq)
+		return -EINVAL;
 
 	pdata = dev_get_platdata(&pdev->dev);
 	if (!pdata) {
-- 
2.30.2