From: Ben Hutchings <bhutchings@solarflare.com>
Date: Wed, 13 Jan 2010 04:34:25 +0000 (+0000)
Subject: sfc: Fix polling for slow MCDI operations
X-Git-Tag: upstream/snapshot3+hdmi~15639^2~97
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=55029c1d65158aea9672c5dfadb43a57f23e3100;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

sfc: Fix polling for slow MCDI operations

When the interface is down and we are using polled mode for MCDI
operations, we busy-wait for completion for approximately 1 jiffy
using udelay() and then back off to schedule().  But the completion
will not wake the task, since we are using polled mode!  We must use
schedule_timeout_uninterruptible() instead.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/sfc/mcdi.c b/drivers/net/sfc/mcdi.c
index 683353b..0d4eba7 100644
--- a/drivers/net/sfc/mcdi.c
+++ b/drivers/net/sfc/mcdi.c
@@ -142,8 +142,9 @@ static int efx_mcdi_poll(struct efx_nic *efx)
 		if (spins != 0) {
 			--spins;
 			udelay(1);
-		} else
-			schedule();
+		} else {
+			schedule_timeout_uninterruptible(1);
+		}
 
 		time = get_seconds();