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From:   Ben Hutchings <ben@decadent.org.uk>
To:     linux-kernel@vger.kernel.org, stable@vger.kernel.org
CC:     akpm@linux-foundation.org, Denis Kirjanov <kda@linux-powerpc.org>,
        "Sergei Shtylyov" <sergei.shtylyov@cogentembedded.com>,
        "Jens Axboe" <axboe@kernel.dk>,
        "Geert Uytterhoeven" <geert+renesas@glider.be>,
        "Simon Horman" <horms+renesas@verge.net.au>
Date:   Tue, 02 Apr 2019 14:38:27 +0100
Message-ID: <lsq.1554212307.752305447@decadent.org.uk>
Subject: [PATCH 3.16 28/99] sata_rcar: fix deferred probing
In-Reply-To: <lsq.1554212307.17110877@decadent.org.uk>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

3.16.65-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>

commit 9f83cfdb1ace3ef268ecc6fda50058d2ec37d603 upstream.

The driver overrides the error codes returned by platform_get_irq() to
-EINVAL, 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")
Reviewed-by: Simon Horman <horms+renesas@verge.net.au>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
 drivers/ata/sata_rcar.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/ata/sata_rcar.c
+++ b/drivers/ata/sata_rcar.c
@@ -874,7 +874,9 @@ static int sata_rcar_probe(struct platfo
 	int ret = 0;
 
 	irq = platform_get_irq(pdev, 0);
-	if (irq <= 0)
+	if (irq < 0)
+		return irq;
+	if (!irq)
 		return -EINVAL;
 
 	priv = devm_kzalloc(&pdev->dev, sizeof(struct sata_rcar_priv),