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Message-ID: <20180126005326.GA15234@electric-eye.fr.zoreil.com> Date: Fri, 26 Jan 2018 01:53:26 +0100 From: Francois Romieu <romieu@...zoreil.com> To: David Miller <davem@...emloft.net> Cc: o.freyermuth@...glemail.com, netdev@...r.kernel.org Subject: [PATCH net 1/1] r8169: fix memory corruption on retrieval of hardware statistics. Hardware statistics retrieval hurts in tight invocation loops. Avoid extraneous write and enforce strict ordering of writes targeted to the tally counters dump area address registers. Signed-off-by: Francois Romieu <romieu@...zoreil.com> Tested-by: Oliver Freyermuth <o.freyermuth@...glemail.com> --- drivers/net/ethernet/realtek/r8169.c | 9 ++------- 1 file changed, 2 insertions(+), 7 deletions(-) diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c index 272c5962e4f7..8e91274174f1 100644 --- a/drivers/net/ethernet/realtek/r8169.c +++ b/drivers/net/ethernet/realtek/r8169.c @@ -2235,19 +2235,14 @@ static bool rtl8169_do_counters(struct net_device *dev, u32 counter_cmd) void __iomem *ioaddr = tp->mmio_addr; dma_addr_t paddr = tp->counters_phys_addr; u32 cmd; - bool ret; RTL_W32(CounterAddrHigh, (u64)paddr >> 32); + RTL_R32(CounterAddrHigh); cmd = (u64)paddr & DMA_BIT_MASK(32); RTL_W32(CounterAddrLow, cmd); RTL_W32(CounterAddrLow, cmd | counter_cmd); - ret = rtl_udelay_loop_wait_low(tp, &rtl_counters_cond, 10, 1000); - - RTL_W32(CounterAddrLow, 0); - RTL_W32(CounterAddrHigh, 0); - - return ret; + return rtl_udelay_loop_wait_low(tp, &rtl_counters_cond, 10, 1000); } static bool rtl8169_reset_counters(struct net_device *dev) -- 2.14.3
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