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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Sergey Shtylyov <s.shtylyov@omprussia.ru>,
        Jens Axboe <axboe@kernel.dk>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 102/190] sata_mv: add IRQ checks
Date:   Thu, 20 May 2021 11:22:46 +0200
Message-Id: <20210520092105.569626468@linuxfoundation.org>
In-Reply-To: <20210520092102.149300807@linuxfoundation.org>
References: <20210520092102.149300807@linuxfoundation.org>
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From: Sergey Shtylyov <s.shtylyov@omprussia.ru>

[ Upstream commit e6471a65fdd5efbb8dd2732dd0f063f960685ceb ]

The function mv_platform_probe() neglects to check the results of the
calls to platform_get_irq() and irq_of_parse_and_map() and blithely
passes them to ata_host_activate() -- while the latter only checks
for IRQ0 (treating it as a polling mode indicattion) and passes the
negative values to devm_request_irq() causing it to fail as it takes
unsigned values for the IRQ #...

Add to mv_platform_probe() the proper IRQ checks to pass the positive IRQ
#s to ata_host_activate(), propagate upstream the negative error codes,
and override the IRQ0 with -EINVAL (as we don't want the polling mode).

Fixes: f351b2d638c3 ("sata_mv: Support SoC controllers")
Signed-off-by: Sergey Shtylyov <s.shtylyov@omprussia.ru>
Link: https://lore.kernel.org/r/51436f00-27a1-e20b-c21b-0e817e0a7c86@omprussia.ru
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/ata/sata_mv.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 5718dc94c90c..601ea2e9fcf9 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -4101,6 +4101,10 @@ static int mv_platform_probe(struct platform_device *pdev)
 		n_ports = mv_platform_data->n_ports;
 		irq = platform_get_irq(pdev, 0);
 	}
+	if (irq < 0)
+		return irq;
+	if (!irq)
+		return -EINVAL;
 
 	host = ata_host_alloc_pinfo(&pdev->dev, ppi, n_ports);
 	hpriv = devm_kzalloc(&pdev->dev, sizeof(*hpriv), GFP_KERNEL);
-- 
2.30.2