linux-kernel - [PATCH 3/4] power: reset: at91-poweroff: check shdwc data structure at the beginning of probe

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Date:   Mon, 5 Nov 2018 11:14:28 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <sre@...nel.org>, <Nicolas.Ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>
CC:     <linux-pm@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <Claudiu.Beznea@...rochip.com>
Subject: [PATCH 3/4] power: reset: at91-poweroff: check shdwc data structure
 at the beginning of probe

Check at91_shdwc before continuing with probe since we want only one instance of
this driver. Inspired from commit 9f1e44774be5 ("power: reset: at91-poweroff:
do not procede if at91_shdwc is allocated").

Signed-off-by: Claudiu Beznea <claudiu.beznea@...rochip.com>
---
 drivers/power/reset/at91-poweroff.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/power/reset/at91-poweroff.c b/drivers/power/reset/at91-poweroff.c
index 48661e04a3de..e75d8f0f0526 100644
--- a/drivers/power/reset/at91-poweroff.c
+++ b/drivers/power/reset/at91-poweroff.c
@@ -160,6 +160,9 @@ static int __init at91_poweroff_probe(struct platform_device *pdev)
 	u32 ddr_type;
 	int ret;
 
+	if (at91_shdwc)
+		return -EBUSY;
+
 	at91_shdwc = devm_kzalloc(&pdev->dev, sizeof(*at91_shdwc), GFP_KERNEL);
 	if (!at91_shdwc)
 		return -ENOMEM;
-- 
2.7.4