Date: Wed, 24 Apr 2013 19:33:37 +0000 (UTC) From: Alexander Motin <mav@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: r249852 - stable/9/sys/dev/ahci Message-ID: <201304241933.r3OJXbQX095240@svn.freebsd.org>
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Author: mav Date: Wed Apr 24 19:33:37 2013 New Revision: 249852 URL: http://svnweb.freebsd.org/changeset/base/249852 Log: MFC r248704: Read Asynchronous Notification statuses only if Port Multiplier or ATAPI device are connected. ATA disks are not using ANs, while the extra register read operation is quite expensive. Modified: stable/9/sys/dev/ahci/ahci.c Directory Properties: stable/9/sys/ (props changed) stable/9/sys/dev/ (props changed) Modified: stable/9/sys/dev/ahci/ahci.c ============================================================================== --- stable/9/sys/dev/ahci/ahci.c Wed Apr 24 19:24:53 2013 (r249851) +++ stable/9/sys/dev/ahci/ahci.c Wed Apr 24 19:33:37 2013 (r249852) @@ -1524,7 +1524,8 @@ ahci_ch_intr(void *data) if (ch->numrslots != ch->numtslots) cstatus |= ATA_INL(ch->r_mem, AHCI_P_CI); /* Read SNTF in one of possible ways. */ - if (istatus & AHCI_P_IX_SDB) { + if ((istatus & AHCI_P_IX_SDB) && + (ch->pm_present || ch->curr[0].atapi != 0)) { if (ch->caps & AHCI_CAP_SSNTF) sntf = ATA_INL(ch->r_mem, AHCI_P_SNTF); else if (ch->fbs_enabled) {
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