Date: Wed, 9 Nov 2011 21:53:49 +0000 (UTC) From: Xin LI <delphij@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r227409 - head/sys/dev/mfi Message-ID: <201111092153.pA9LrnIH001583@svn.freebsd.org>
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Author: delphij Date: Wed Nov 9 21:53:49 2011 New Revision: 227409 URL: http://svn.freebsd.org/changeset/base/227409 Log: 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 MFC after: 3 days Submitted by: scottl Ok'ed by: jhb Modified: head/sys/dev/mfi/mfi.c Modified: head/sys/dev/mfi/mfi.c ============================================================================== --- head/sys/dev/mfi/mfi.c Wed Nov 9 21:41:18 2011 (r227408) +++ head/sys/dev/mfi/mfi.c Wed Nov 9 21:53:49 2011 (r227409) @@ -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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