libata: mask swap internal and hardware tag

axboe · axboe · commit 7ce5c8cd753f · 2018-09-20T08:30:55.000-06:00
hen we're comparing the hardware completion mask passed in from the driver with the internal tag pending mask, we need to account for the fact that the internal tag is different from the hardware tag. If not, then we can end up either prematurely completing the internal tag (since it's not set in the hw mask), or simply flag an error: ata2: illegal qc_active transition (100000000->00000001) If the internal tag is set, then swap that with the hardware tag in this case before comparing with what the hardware reports. Fixes: 28361c4 ("libata: add extra internal command") Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=201151 Cc: stable@vger.kernel.org Reported-by: Paul Sbarra <sbarra.paul@gmail.com> Tested-by: Paul Sbarra <sbarra.paul@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
@@ -5359,10 +5359,20 @@ void ata_qc_complete(struct ata_queued_cmd *qc)
  */
 int ata_qc_complete_multiple(struct ata_port *ap, u64 qc_active)
 {
+	u64 done_mask, ap_qc_active = ap->qc_active;
 	int nr_done = 0;
-	u64 done_mask;
 
-	done_mask = ap->qc_active ^ qc_active;
+	/*
+	 * If the internal tag is set on ap->qc_active, then we care about
+	 * bit0 on the passed in qc_active mask. Move that bit up to match
+	 * the internal tag.
+	 */
+	if (ap_qc_active & (1ULL << ATA_TAG_INTERNAL)) {
+		qc_active |= (qc_active & 0x01) << ATA_TAG_INTERNAL;
+		qc_active ^= qc_active & 0x01;
+	}
+
+	done_mask = ap_qc_active ^ qc_active;
 
 	if (unlikely(done_mask & qc_active)) {
 		ata_port_err(ap, "illegal qc_active transition (%08llx->%08llx)\n",
