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

[Claudiu.Beznea]

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@xxxxxxxxxxxxx>
---
 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