[PATCH 6.12.y-cip v2 07/17] reset: rzg2l-usbphy-ctrl: Check pwrrdy is valid before using it

From: Claudiu Beznea <[email protected]>

commit e0cf84109bc6c6768337123f1de24ff56b41c91b upstream.

The pwrrdy regmap_filed is allocated in rzg2l_usbphy_ctrl_pwrrdy_init()
only if the driver data is set to RZG2L_USBPHY_CTRL_PWRRDY. Check that
pwrrdy is valid before using it to avoid "Unable to handle kernel NULL
pointer dereference at virtual address" errors.

Fixes: c5b7cd9adefc ("reset: rzg2l-usbphy-ctrl: Add suspend/resume support")
Signed-off-by: Claudiu Beznea <[email protected]>
Reviewed-by: Biju Das <[email protected]>
Signed-off-by: Philipp Zabel <[email protected]>
Signed-off-by: Claudiu Beznea <[email protected]>
---

Changes in v2:
- none

 drivers/reset/reset-rzg2l-usbphy-ctrl.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/reset/reset-rzg2l-usbphy-ctrl.c b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
index b09ba063339a..e6970ae6f9ca 100644
--- a/drivers/reset/reset-rzg2l-usbphy-ctrl.c
+++ b/drivers/reset/reset-rzg2l-usbphy-ctrl.c
@@ -136,6 +136,9 @@ static int rzg2l_usbphy_ctrl_set_pwrrdy(struct regmap_field *pwrrdy,
 {
 	u32 val = power_on ? 0 : 1;
 
+	if (!pwrrdy)
+		return 0;
+
 	/* The initialization path guarantees that the mask is 1 bit long. */
 	return regmap_field_update_bits(pwrrdy, 1, val);
 }
-- 
2.43.0