the bitop API should be a little faster than the loop.
Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx>
---
drivers/ata/libata-core.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
Index: linux/drivers/ata/libata-core.c
===================================================================
--- linux.orig/drivers/ata/libata-core.c 2009-09-02 10:06:47.000000000 +0800
+++ linux/drivers/ata/libata-core.c 2009-09-02 10:07:47.000000000 +0800
@@ -4842,11 +4842,15 @@ static struct ata_queued_cmd *ata_qc_new
return NULL;
/* the last tag is reserved for internal command. */
- for (i = 0; i < ATA_MAX_QUEUE - 1; i++)
+ while (1) {
+ i = find_first_zero_bit(&ap->qc_allocated, ATA_MAX_QUEUE - 1);
+ if (i >= ATA_MAX_QUEUE - 1)
+ break;
if (!test_and_set_bit(i, &ap->qc_allocated)) {
qc = __ata_qc_from_tag(ap, i);
break;
}
+ }
if (qc)
qc->tag = i;
--
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