Author: gonzo
Date: Thu Dec 13 03:33:01 2012
New Revision: 244169
URL: http://svnweb.freebsd.org/changeset/base/244169
Log:
Disable interrupts in filter in order to avoid interrupt storm and
CPU starvation
Modified:
head/sys/dev/smc/if_smc.c
Modified: head/sys/dev/smc/if_smc.c
==============================================================================
--- head/sys/dev/smc/if_smc.c Thu Dec 13 02:21:05 2012 (r244168)
+++ head/sys/dev/smc/if_smc.c Thu Dec 13 03:33:01 2012 (r244169)
@@ -807,6 +807,10 @@ smc_intr(void *context)
struct smc_softc *sc;
sc = (struct smc_softc *)context;
+ /*
+ * Block interrupts in order to let smc_task_intr to kick in
+ */
+ smc_write_1(sc, MSK, 0);
taskqueue_enqueue_fast(sc->smc_tq, &sc->smc_intr);
return (FILTER_HANDLED);
}
@@ -827,13 +831,6 @@ smc_task_intr(void *context, int pending
smc_select_bank(sc, 2);
/*
- * Get the current mask, and then block all interrupts while we're
- * working.
- */
- if ((ifp->if_capenable & IFCAP_POLLING) == 0)
- smc_write_1(sc, MSK, 0);
-
- /*
* Find out what interrupts are flagged.
*/
status = smc_read_1(sc, IST) & sc->smc_mask;
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