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Read Asynchronous Notification statuses only if Port Multiplier or ATAPI

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device are connected. ATA disks are not using ANs, while the extra register
read operation is quite expensive.
This commit is contained in:
Alexander Motin 2013-03-25 13:58:17 +00:00
parent cd08290b48
commit 6a740c4a4f
1 changed files with 2 additions and 1 deletions
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3
sys/dev/ahci/ahci.c
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@ -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) {