[PATCH] ata: libata-eh: drop redundant ata_tag_valid() check in ata_eh_maybe_retry_flush()

[<shao.mingyin@zte.com.cn>]

From: Shao Mingyin <shao.mingyin@zte.com.cn>

ata_eh_maybe_retry_flush() validates link->active_tag with ata_tag_valid()
before calling __ata_qc_from_tag(), which itself evaluates ata_tag_valid()
on the same tag and returns NULL when the tag is invalid.

Since the NULL return value of __ata_qc_from_tag() is the single source of
truth for tag validity, drop the redundant explicit ata_tag_valid() check
and simply return early when qc is NULL.  This mirrors the style already
used in ata_eh_get_non_ncq_success_sense().

No functional change.

Signed-off-by: Shao Mingyin <shao.mingyin@zte.com.cn>
Signed-off-by: Yang Tao <yang.tao172@zte.com.cn>
---
 drivers/ata/libata-eh.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c
index c93c24b22d9c..bf3313175a97 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -3571,11 +3571,9 @@ static int ata_eh_maybe_retry_flush(struct ata_device *dev)
 	unsigned int err_mask;
 	int rc = 0;

-	/* did flush fail for this device? */
-	if (!ata_tag_valid(link->active_tag))
-		return 0;
-
 	qc = __ata_qc_from_tag(ap, link->active_tag);
+	if (!qc)
+		return 0;
 	if (qc->dev != dev || (qc->tf.command != ATA_CMD_FLUSH_EXT &&
 			       qc->tf.command != ATA_CMD_FLUSH))
 		return 0;
-- 
2.27.0