Author: mav
Date: Mon Mar 25 13:58:17 2013
New Revision: 248704
URL: http://svnweb.freebsd.org/changeset/base/248704
Log:
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:
head/sys/dev/ahci/ahci.c
Modified: head/sys/dev/ahci/ahci.c
==============================================================================
--- head/sys/dev/ahci/ahci.c Mon Mar 25 13:33:06 2013 (r248703)
+++ head/sys/dev/ahci/ahci.c Mon Mar 25 13:58:17 2013 (r248704)
@@ -1466,7 +1466,8 @@ 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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