sh_eth: workaround for spurious ECI interrupt

At least on Renesas R8A7778, EESR.ECI interrupt seems to fire regardless of its
mask in EESIPR register. I can 100% reproduce it with the following scenario:
target is booted with 'ip=on' option, and so IP-Config opens SoC Ether device
but doesn't get a proper reply and then succeeds with on-board SMC chip; then
I login and try to bring up the SoC Ether device with 'ifconfig', and I get
an ECI interrupt once request_irq() is called by sh_eth_open() (while interrupt
mask in EESIPR register is all 0), if that interrupt is accompanied by a pending
EESR.FRC (frame receive completion) interrupt, I get kernel oops in sh_eth_rx()
because sh_eth_ring_init() hasn't been called yet!

The solution I worked out is the following: in sh_eth_interrupt(), mask the
interrupt status from EESR register with the interrupt mask from EESIPR register
in order not to handle the disabled interrupts -- but forcing EESIPR.M_ECI bit
in this mask set because we always need to fully handle EESR.ECI interrupt in
sh_eth_error() in order to quench it (as it doesn't get cleared by just writing
1 to the this bit as all the other interrupts).

While at it, remove unneeded initializer for 'intr_status' variable and give it
*unsigned long* type, matching the type of sh_eth_read()'s result; fix comment.

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Reviewed-by: Max Filippov <max.filippov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/ethernet/renesas/sh_eth.c b/drivers/net/ethernet/renesas/sh_eth.c
index 1ca8b2b10adcc0ce7183a7633d20069d47c641ba..44f7904e50545f9b5efb7c98d4cc56b4f095436f 100644 (file)
--- a/drivers/net/ethernet/renesas/sh_eth.c
+++ b/drivers/net/ethernet/renesas/sh_eth.c
@@ -1324,12 +1324,18 @@ static irqreturn_t sh_eth_interrupt(int irq, void *netdev)
        struct sh_eth_private *mdp = netdev_priv(ndev);
        struct sh_eth_cpu_data *cd = mdp->cd;
        irqreturn_t ret = IRQ_NONE;
-       u32 intr_status = 0;
+       unsigned long intr_status;
 
        spin_lock(&mdp->lock);
 
-       /* Get interrpt stat */
+       /* Get interrupt status */
        intr_status = sh_eth_read(ndev, EESR);
+       /* Mask it with the interrupt mask, forcing ECI interrupt to be always
+        * enabled since it's the one that  comes thru regardless of the mask,
+        * and we need to fully handle it in sh_eth_error() in order to quench
+        * it as it doesn't get cleared by just writing 1 to the ECI bit...
+        */
+       intr_status &= sh_eth_read(ndev, EESIPR) | DMAC_M_ECI;
        /* Clear interrupt */
        if (intr_status & (EESR_FRC | EESR_RMAF | EESR_RRF |
                        EESR_RTLF | EESR_RTSF | EESR_PRE | EESR_CERF |