From 05a39224894e59771f956c001f75eba2ad6d201d Mon Sep 17 00:00:00 2001 From: Dong Aisheng Date: Wed, 16 Nov 2011 17:46:59 +0800 Subject: [PATCH] ENGR00162364 flexcan: fix endless errors causing system hang Clear state error to avoid ednless state error if error happens which will call napi_schedule() each time, seems a little high load, to cause system hang. Signed-off-by: Dong Aisheng --- drivers/net/can/flexcan.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/net/can/flexcan.c b/drivers/net/can/flexcan.c index 83cbbee95f8d..b01e59bac733 100644 --- a/drivers/net/can/flexcan.c +++ b/drivers/net/can/flexcan.c @@ -435,11 +435,15 @@ static void do_state(struct net_device *dev, static int flexcan_poll_state(struct net_device *dev, u32 reg_esr) { struct flexcan_priv *priv = netdev_priv(dev); + struct flexcan_regs __iomem *regs = priv->base; struct sk_buff *skb; struct can_frame *cf; enum can_state new_state; int flt; + /* clear state error if any (write 1 to clear)*/ + writel(reg_esr, ®s->esr); + flt = reg_esr & FLEXCAN_ESR_FLT_CONF_MASK; if (likely(flt == FLEXCAN_ESR_FLT_CONF_ACTIVE)) { if (likely(!(reg_esr & (FLEXCAN_ESR_TX_WRN | -- 2.39.5