Author: delphij
Date: Tue Nov 15 17:42:00 2011
New Revision: 227534
URL: http://svn.freebsd.org/changeset/base/227534
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
Submitted by: scottl
Ok'ed by: jhb
Approved by: re (kib)
Modified:
releng/9.0/sys/dev/mfi/mfi.c
Directory Properties:
releng/9.0/sys/ (props changed)
Modified: releng/9.0/sys/dev/mfi/mfi.c
==============================================================================
--- releng/9.0/sys/dev/mfi/mfi.c Tue Nov 15 17:30:03 2011
(r227533)
+++ releng/9.0/sys/dev/mfi/mfi.c Tue Nov 15 17:42:00 2011
(r227534)
@@ -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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