[PATCH 5.4 271/355] clk: at91: check pmc node status before registering syscore ops

[Greg Kroah-Hartman]

From: Clément Léger <clement.leger@xxxxxxxxxxx>

[ Upstream commit c405f5c15e9f6094f2fa1658e73e56f3058e2122 ]

Currently, at91 pmc driver always register the syscore_ops whatever
the status of the pmc node that has been found. When set as secure
and disabled, the pmc should not be accessed or this will generate
abort exceptions.
To avoid this, add a check on node availability before registering
the syscore operations.

Signed-off-by: Clément Léger <clement.leger@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210913082633.110168-1-clement.leger@xxxxxxxxxxx
Acked-by: Nicolas Ferre <nicolas.ferre@xxxxxxxxxxxxx>
Reviewed-by: Claudiu Beznea <claudiu.beznea@xxxxxxxxxxxxx>
Fixes: b3b02eac33ed ("clk: at91: Add sama5d2 suspend/resume")
Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/clk/at91/pmc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/clk/at91/pmc.c b/drivers/clk/at91/pmc.c
index b71515acdec1f..976ca41e9157e 100644
--- a/drivers/clk/at91/pmc.c
+++ b/drivers/clk/at91/pmc.c
@@ -275,6 +275,11 @@ static int __init pmc_register_ops(void)
 
 	np = of_find_matching_node(NULL, sama5d2_pmc_dt_ids);
 
+	if (!of_device_is_available(np)) {
+		of_node_put(np);
+		return -ENODEV;
+	}
+
 	pmcreg = device_node_to_regmap(np);
 	if (IS_ERR(pmcreg))
 		return PTR_ERR(pmcreg);
-- 
2.33.0