From: Stephen Hemminger <shemminger@linux-foundation.org>
Date: Tue, 4 Dec 2007 01:02:17 +0000 (-0800)
Subject: sky2: recovery deadlock fix
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8cfcbe998aa0459e20bbad61376f81c1715b25d6;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

sky2: recovery deadlock fix

Prevent deadlock in sky2 recovery logic. sky2_down calls napi_synchronize
which gets stuck if napi was already disabled.

Fix by rearranging slightly and not calling napi_disable until after
both ports are stopped. The napi_disable probably is being overly
paranoid, but it is safe now.

Signed-off-by: Stephen Hemminger <shemminger@linux-foundation.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
---

diff --git a/drivers/net/sky2.c b/drivers/net/sky2.c
index 3d1dfc948405..6197afb3ed83 100644
--- a/drivers/net/sky2.c
+++ b/drivers/net/sky2.c
@@ -2906,16 +2906,14 @@ static void sky2_restart(struct work_struct *work)
 	int i, err;
 
 	rtnl_lock();
-	sky2_write32(hw, B0_IMSK, 0);
-	sky2_read32(hw, B0_IMSK);
-	napi_disable(&hw->napi);
-
 	for (i = 0; i < hw->ports; i++) {
 		dev = hw->dev[i];
 		if (netif_running(dev))
 			sky2_down(dev);
 	}
 
+	napi_disable(&hw->napi);
+	sky2_write32(hw, B0_IMSK, 0);
 	sky2_reset(hw);
 	sky2_write32(hw, B0_IMSK, Y2_IS_BASE);
 	napi_enable(&hw->napi);