[PATCH 4.18 126/158] thermal: rcar_thermal: avoid NULL dereference in absence of IRQ resources

[Greg Kroah-Hartman]

4.18-stable review patch.  If anyone has any objections, please let me know.

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

From: Simon Horman <horms+renesas@xxxxxxxxxxxx>

[ Upstream commit 542cdf4068049458e1411b120bd5a4bbe3ddc49a ]

Ensure that the base address used by a call to rcar_thermal_common_write()
may be NULL if the SOC supports interrupts for use with the thermal device
but none are defined in DT as is the case for R-Car H1 (r8a7779). Guard
against this condition to prevent a NULL dereference when the device is
probed.

Tested on:
* R-Mobile APE6 (r8a73a4) / APE6EVM
* R-Car H1 (r8a7779) / Marzen
* R-Car H2 (r8a7790) / Lager
* R-Car M2-W (r8a7791) / Koelsch
* R-Car M2-N (r8a7793) / Gose
* R-Car D3 ES1.0 (r8a77995) / Draak

Fixes: 1969d9dc2079 ("thermal: rcar_thermal: add r8a77995 support")
Signed-off-by: Simon Horman <horms+renesas@xxxxxxxxxxxx>
Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Signed-off-by: Eduardo Valentin <edubezval@xxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/thermal/rcar_thermal.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/thermal/rcar_thermal.c
+++ b/drivers/thermal/rcar_thermal.c
@@ -598,7 +598,7 @@ static int rcar_thermal_probe(struct pla
 			enr_bits |= 3 << (i * 8);
 	}
 
-	if (enr_bits)
+	if (common->base && enr_bits)
 		rcar_thermal_common_write(common, ENR, enr_bits);
 
 	dev_info(dev, "%d sensor probed\n", i);