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@brocade.com>
Signed-off-by: Rasesh Mody <rmody@brocade.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

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);
 }