[PATCH net 2/5] net: dsa: b53: fix the SRAB grant timeout check

[Florian Fainelli <florian.fainelli@broadcom.com>]

b53_srab_request_grant() polls for a grant up to 20 times, but checks for
an iteration count of five to detect a timeout. This rejects a grant
received on the sixth poll and reports success when all 20 polls finish
without a grant. The latter allows a register access to proceed without
ownership of the switch resources.

Check for exhaustion of all 20 iterations instead.

Fixes: 967dd82ffc52 ("net: dsa: b53: Add support for Broadcom RoboSwitch")
Signed-off-by: Florian Fainelli <florian.fainelli@broadcom.com>
---
 drivers/net/dsa/b53/b53_srab.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/dsa/b53/b53_srab.c b/drivers/net/dsa/b53/b53_srab.c
index 83a03fca142a..f4689078ccd5 100644
--- a/drivers/net/dsa/b53/b53_srab.c
+++ b/drivers/net/dsa/b53/b53_srab.c
@@ -105,7 +105,7 @@ static int b53_srab_request_grant(struct b53_device *dev)
 			break;
 		usleep_range(10, 100);
 	}
-	if (WARN_ON(i == 5))
+	if (WARN_ON(i == 20))
 		return -EIO;
 
 	return 0;
-- 
2.53.0