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Don't enable write cacheing on devices that don't support tagged queuing

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unless hw.ata.wc is set.

Approved by:	sos
MFC after:	1 week
This commit is contained in:
Dag-Erling Smørgrav 2001-10-24 18:24:09 +00:00
parent 62b151c324
commit 27c97f7660
1 changed files with 1 additions and 1 deletions
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2
sys/dev/ata/ata-disk.c
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@ -158,7 +158,7 @@ ad_attach(struct ata_softc *scp, int device)
ata_printf(scp, device, "enabling readahead cache failed\n");
/* enable write cacheing if allowed and not default on device */
if (ata_wc || ata_tags) {
if (ata_wc || (ata_tags && ad_tagsupported(adp))) {
if (ata_command(adp->controller, adp->unit, ATA_C_SETFEATURES,
0, 0, ATA_C_F_ENAB_WCACHE, ATA_WAIT_INTR))
ata_printf(scp, device, "enabling write cache failed\n");