netdev - [PATCH net-next 1/4] net: dsa: mv88e6xxx: Fix sparse warnings from GENMASK

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Date:   Sun,  5 Jul 2020 21:38:07 +0200
From:   Andrew Lunn <andrew@...n.ch>
To:     David Miller <davem@...emloft.net>
Cc:     netdev <netdev@...r.kernel.org>,
        Vivien Didelot <vivien.didelot@...il.com>,
        Andrew Lunn <andrew@...n.ch>
Subject: [PATCH net-next 1/4] net: dsa: mv88e6xxx: Fix sparse warnings from GENMASK

Oddly, GENMASK() requires signed bit numbers, so that it can compare
them for < 0. If passed an unsigned type, we get warnings about the
test never being true.

Signed-off-by: Andrew Lunn <andrew@...n.ch>
---
 drivers/net/dsa/mv88e6xxx/chip.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index e5430cf2ad71..1c541b074256 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -167,7 +167,7 @@ struct mv88e6xxx_irq {
 	u16 masked;
 	struct irq_chip chip;
 	struct irq_domain *domain;
-	unsigned int nirqs;
+	int nirqs;
 };
 
 /* state flags for mv88e6xxx_port_hwtstamp::state */
@@ -654,7 +654,7 @@ static inline unsigned int mv88e6xxx_num_ports(struct mv88e6xxx_chip *chip)
 
 static inline u16 mv88e6xxx_port_mask(struct mv88e6xxx_chip *chip)
 {
-	return GENMASK(mv88e6xxx_num_ports(chip) - 1, 0);
+	return GENMASK((s32)mv88e6xxx_num_ports(chip) - 1, 0);
 }
 
 static inline unsigned int mv88e6xxx_num_gpio(struct mv88e6xxx_chip *chip)
-- 
2.27.0.rc2