From 834188992f0718f50247840cf29d7be45d87a647 Mon Sep 17 00:00:00 2001 From: delphij Date: Tue, 15 Nov 2011 17:42:00 +0000 Subject: [PATCH] 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) git-svn-id: svn://svn.freebsd.org/base/releng/9.0@227534 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f --- sys/dev/mfi/mfi.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/sys/dev/mfi/mfi.c b/sys/dev/mfi/mfi.c index 8a3d277e..48c08881 100644 --- a/sys/dev/mfi/mfi.c +++ b/sys/dev/mfi/mfi.c @@ -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); -- 2.45.0