Partly revert "sfc: Handle serious errors in exactly one interrupt handler"

This reverts commit 6369545945b90daa1a73fca174da9194c398417c in
drivers/net/ethernet/sfc/falcon.c.

Unlike the INT_ISR0 register on later controller revisions, the
NET_IVEC_INT_Q bits written to memory are only ever set for
interrupting event queues, not for any other interrupt sources.

By definition there can only be one legacy interrupt handler per
function, so there is no need to worry about detecting a fatal
interrupt more than once.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>

diff --git a/drivers/net/ethernet/sfc/falcon.c b/drivers/net/ethernet/sfc/falcon.c
index 0b7880b0b8fc23d9807a2e306ceec65d5ee9a078..b4e91edec0fa9f7b1371dbb4860b255a2882554b 100644 (file)
--- a/drivers/net/ethernet/sfc/falcon.c
+++ b/drivers/net/ethernet/sfc/falcon.c
@@ -174,19 +174,16 @@ irqreturn_t falcon_legacy_interrupt_a1(int irq, void *dev_id)
                   "IRQ %d on CPU %d status " EFX_OWORD_FMT "\n",
                   irq, raw_smp_processor_id(), EFX_OWORD_VAL(*int_ker));
 
+       /* Check to see if we have a serious error condition */
+       syserr = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);
+       if (unlikely(syserr))
+               return efx_nic_fatal_interrupt(efx);
+
        /* Determine interrupting queues, clear interrupt status
         * register and acknowledge the device interrupt.
         */
        BUILD_BUG_ON(FSF_AZ_NET_IVEC_INT_Q_WIDTH > EFX_MAX_CHANNELS);
        queues = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_INT_Q);
-
-       /* Check to see if we have a serious error condition */
-       if (queues & (1U << efx->fatal_irq_level)) {
-               syserr = EFX_OWORD_FIELD(*int_ker, FSF_AZ_NET_IVEC_FATAL_INT);
-               if (unlikely(syserr))
-                       return efx_nic_fatal_interrupt(efx);
-       }
-
        EFX_ZERO_OWORD(*int_ker);
        wmb(); /* Ensure the vector is cleared before interrupt ack */
        falcon_irq_ack_a1(efx);