From: Jonathan Toppins <jtoppins@redhat.com>
Date: Wed, 14 Mar 2018 16:36:25 +0000 (-0400)
Subject: tg3: prevent scheduling while atomic splat
X-Git-Tag: v4.16-rc7~23^2~45
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ea91df6d8a55836c7401eb6d5d4d828b659d8d67;p=users%2Fwilly%2Fxarray.git

tg3: prevent scheduling while atomic splat

The problem was introduced in commit
506b0a395f26 ("[netdrv] tg3: APE heartbeat changes"). The bug occurs
because tp->lock spinlock is held which is obtained in tg3_start
by way of tg3_full_lock(), line 11571. The documentation for usleep_range()
specifically states it cannot be used inside a spinlock.

Fixes: 506b0a395f26 ("[netdrv] tg3: APE heartbeat changes")
Signed-off-by: Jonathan Toppins <jtoppins@redhat.com>
Acked-by: Michael Chan <michael.chan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethernet/broadcom/tg3.c b/drivers/net/ethernet/broadcom/tg3.c
index c1841db1b500..f2593978ae75 100644
--- a/drivers/net/ethernet/broadcom/tg3.c
+++ b/drivers/net/ethernet/broadcom/tg3.c
@@ -820,7 +820,7 @@ static int tg3_ape_event_lock(struct tg3 *tp, u32 timeout_us)
 
 		tg3_ape_unlock(tp, TG3_APE_LOCK_MEM);
 
-		usleep_range(10, 20);
+		udelay(10);
 		timeout_us -= (timeout_us > 10) ? 10 : timeout_us;
 	}