Albert Lee wrote:
...
+ /* some drives raise INTRQ early before clearing BSY */
+ if (unlikely(qc->dev->horkage & ATA_HORKAGE_EARLY_IRQ))
+ /* wait up to 10 microseconds for BSY to clear */
+ ata_busy_wait_alt(ap, ATA_BUSY, ATA_EARLY_IRQ_WAIT);
+
/* check altstatus */
status = ata_altstatus(ap);
if (status & ATA_BUSY)
...
I dunno.
I think a much simpler patch could address the same situation,
with *no blacklist* to maintain, and no added overhead required:
/* check altstatus */
+ retries = 10;
+ while (((status = ata_altstatus(ap)) & ATA_BUSY) && --retries) {
+ udelay(1);
+ }
- status = ata_altstatus(ap);
if (status & ATA_BUSY)
This still just does a single access in the hot path, but without any
real added complexity otherwise.
????
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