netdev - [net-next 1/3] bna: Semaphore Lock Fix

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Date:	Fri, 16 Sep 2011 18:06:46 -0700
From:	Rasesh Mody <rmody@...cade.com>
To:	<davem@...emloft.net>, <netdev@...r.kernel.org>
CC:	<adapter_linux_open_src_team@...cade.com>,
	Rasesh Mody <rmody@...cade.com>,
	Gurunatha Karaje <gkaraje@...cade.com>
Subject: [net-next 1/3] bna: Semaphore Lock Fix

Remove a BUG_ON() as it is not required.

Change the unconditional write to release a semaphore to read sem first
and then write. This will eliminate the possibility of sem getting locked
while trying to release it in case if previous sem_get operation failed.

Signed-off-by: Gurunatha Karaje <gkaraje@...cade.com>
Signed-off-by: Rasesh Mody <rmody@...cade.com>
---
 drivers/net/ethernet/brocade/bna/bfa_ioc.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/net/ethernet/brocade/bna/bfa_ioc.c b/drivers/net/ethernet/brocade/bna/bfa_ioc.c
index 029fb52..4282fef 100644
--- a/drivers/net/ethernet/brocade/bna/bfa_ioc.c
+++ b/drivers/net/ethernet/brocade/bna/bfa_ioc.c
@@ -1201,13 +1201,13 @@ bfa_nw_ioc_sem_get(void __iomem *sem_reg)
 	if (!(r32 & 1))
 		return true;
 
-	BUG_ON(!(cnt < BFA_SEM_SPINCNT));
 	return false;
 }
 
 void
 bfa_nw_ioc_sem_release(void __iomem *sem_reg)
 {
+	readl(sem_reg);
 	writel(1, sem_reg);
 }
 
-- 
1.7.1

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