Date: Tue, 15 Nov 2011 17:30:03 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r227533 - stable/9/sys/dev/mfi Message-ID: <201111151730.pAFHU3ij009961@svn.freebsd.org>
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Author: delphij Date: Tue Nov 15 17:30:03 2011 New Revision: 227533 URL: http://svn.freebsd.org/changeset/base/227533 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: stable/9/sys/dev/mfi/mfi.c Directory Properties: stable/9/sys/ (props changed) Modified: stable/9/sys/dev/mfi/mfi.c ============================================================================== --- stable/9/sys/dev/mfi/mfi.c Tue Nov 15 17:15:09 2011 (r227532) +++ stable/9/sys/dev/mfi/mfi.c Tue Nov 15 17:30:03 2011 (r227533) @@ -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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