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| author | Alexander Motin <mav@FreeBSD.org> | 2013-03-25 13:58:17 +0000 |
|---|---|---|
| committer | Alexander Motin <mav@FreeBSD.org> | 2013-03-25 13:58:17 +0000 |
| commit | 6a740c4a4f52ac5aa8a0f35e828d20d0bf0692a8 (patch) | |
| tree | 144ed38ec7a2dfc80ec07769b3a0013df015e316 /sys/dev/ahci | |
| parent | cd08290b48fe7d68802d110d340f37ea521e09a8 (diff) | |
| download | src-6a740c4a4f52ac5aa8a0f35e828d20d0bf0692a8.tar.gz src-6a740c4a4f52ac5aa8a0f35e828d20d0bf0692a8.zip | |
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.
Notes
Notes:
svn path=/head/; revision=248704
Diffstat (limited to 'sys/dev/ahci')
| -rw-r--r-- | sys/dev/ahci/ahci.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/sys/dev/ahci/ahci.c b/sys/dev/ahci/ahci.c index c39f9741b1ff..f7dba1ebc33f 100644 --- a/sys/dev/ahci/ahci.c +++ b/sys/dev/ahci/ahci.c @@ -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) { |