Author: delphij
Date: Thu Nov 17 11:16:56 2011
New Revision: 227611
URL: http://svn.freebsd.org/changeset/base/227611
Log:
MFC r227409:
Do a dummy read to flush the interrupt ACK that we just performed,
ensuring that everything is really, truly consistent.
This fixes certain cases where one will see various:
mfi0: COMMAND 0xffffffXXXXXXXXXX TIMEOUT AFTER XX SECONDS
Requested by: Vincent Hoffman <vince unsane co uk>
Modified:
stable/8/sys/dev/mfi/mfi.c
Directory Properties:
stable/8/sys/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/7/sys/dev/mfi/mfi.c
Directory Properties:
stable/7/sys/ (props changed)
Modified: stable/8/sys/dev/mfi/mfi.c
==============================================================================
--- stable/8/sys/dev/mfi/mfi.c Thu Nov 17 10:46:51 2011 (r227610)
+++ stable/8/sys/dev/mfi/mfi.c Thu Nov 17 11:16:56 2011 (r227611)
@@ -932,6 +932,12 @@ mfi_intr(void *arg)
if (sc->mfi_check_clear_intr(sc))
return;
+ /*
+ * Do a dummy read to flush the interrupt ACK that we just performed,
+ * ensuring that everything is really, truly consistent.
+ */
+ (void)sc->mfi_read_fw_status(sc);
+
pi = sc->mfi_comms->hw_pi;
ci = sc->mfi_comms->hw_ci;
mtx_lock(&sc->mfi_io_lock);
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