linux-kernel - [PATCH 4/4] phy: sun4i: check PMU presence when poking unknown bit of pmu

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Date:   Sat, 5 Nov 2016 19:13:26 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     <gregkh@...uxfoundation.org>
CC:     <kishon@...com>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 4/4] phy: sun4i: check PMU presence when poking unknown bit of pmu

From: Icenowy Zheng <icenowy@...c.xyz>

Allwinner SoC's PHY 0, when used as OTG controller, have no pmu part.
The code that poke some unknown bit of PMU for H3/A64 didn't check
the PHY, and will cause kernel oops when PHY 0 is used.

This patch will check whether the pmu is not NULL before poking.

Fixes: b3e0d141ca9f (phy: sun4i: add support for A64 usb phy)

Signed-off-by: Icenowy Zheng <icenowy@...c.xyz>
Acked-by: Maxime Ripard <maxime.ripard@...e-electrons.com>
Reviewed-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/phy/phy-sun4i-usb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/phy/phy-sun4i-usb.c b/drivers/phy/phy-sun4i-usb.c
index b9342a2..fec34f5 100644
--- a/drivers/phy/phy-sun4i-usb.c
+++ b/drivers/phy/phy-sun4i-usb.c
@@ -264,7 +264,7 @@ static int sun4i_usb_phy_init(struct phy *_phy)
 		return ret;
 	}
 
-	if (data->cfg->enable_pmu_unk1) {
+	if (phy->pmu && data->cfg->enable_pmu_unk1) {
 		val = readl(phy->pmu + REG_PMU_UNK1);
 		writel(val & ~2, phy->pmu + REG_PMU_UNK1);
 	}
-- 
1.7.9.5