From: Damien Le Moal <damien.lemoal@wdc.com>
Date: Mon, 16 Aug 2021 10:44:52 +0900
Subject: [PATCH] libata: fix ata_read_log_page() warning
Git-commit: fc5c8aa7bc4977205e0ceb93425075f8a8f49501
Patch-mainline: v5.15-rc1
References: jsc#PED-1561

Support for the READ LOG PAGE DMA EXT command is indicated by words 119
and 120 of a device identify data. This is tested in
ata_read_log_page() with ata_id_has_read_log_dma_ext() and the
READ LOG PAGE DMA command used if the device reports supports for it.

However, some devices lie about this support and using the DMA version
of the command fails, generating the warning message "READ LOG DMA EXT
failed, trying PIO". Since READ LOG PAGE DMA EXT is an optional command,
this warning is not at all important but may be scary for the user.
Change ata_read_log_page() to suppres this warning and to print an
error message if both DMA and PIO attempts failed.

With this change, there is no need to print again an error message when
ata_read_log_page() returns an error. So simplify the users of this
function.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Link: https://lore.kernel.org/r/20210816014456.2191776-8-damien.lemoal@wdc.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Acked-by: Hannes Reinecke <hare@suse.com>
---
 drivers/ata/libata-core.c | 47 +++++++++++----------------------------
 1 file changed, 13 insertions(+), 34 deletions(-)

diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c
index f285a2bc8799..5befe6ce6039 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2026,13 +2026,15 @@ unsigned int ata_read_log_page(struct ata_device *dev, u8 log,
 	err_mask = ata_exec_internal(dev, &tf, NULL, DMA_FROM_DEVICE,
 				     buf, sectors * ATA_SECT_SIZE, 0);
 
-	if (err_mask && dma) {
-		dev->horkage |= ATA_HORKAGE_NO_DMA_LOG;
-		ata_dev_warn(dev, "READ LOG DMA EXT failed, trying PIO\n");
-		goto retry;
+	if (err_mask) {
+		if (dma) {
+			dev->horkage |= ATA_HORKAGE_NO_DMA_LOG;
+			goto retry;
+		}
+		ata_dev_err(dev, "Read log page 0x%02x failed, Emask 0x%x\n",
+			    (unsigned int)page, err_mask);
 	}
 
-	DPRINTK("EXIT, err_mask=%x\n", err_mask);
 	return err_mask;
 }
 
@@ -2061,12 +2063,8 @@ static bool ata_identify_page_supported(struct ata_device *dev, u8 page)
 	 */
 	err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, 0, ap->sector_buf,
 				1);
-	if (err) {
-		ata_dev_info(dev,
-			     "failed to get Device Identify Log Emask 0x%x\n",
-			     err);
+	if (err)
 		return false;
-	}
 
 	for (i = 0; i < ap->sector_buf[8]; i++) {
 		if (ap->sector_buf[9 + i] == page)
@@ -2130,11 +2128,7 @@ static void ata_dev_config_ncq_send_recv(struct ata_device *dev)
 	}
 	err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_SEND_RECV,
 				     0, ap->sector_buf, 1);
-	if (err_mask) {
-		ata_dev_dbg(dev,
-			    "failed to get NCQ Send/Recv Log Emask 0x%x\n",
-			    err_mask);
-	} else {
+	if (!err_mask) {
 		u8 *cmds = dev->ncq_send_recv_cmds;
 
 		dev->flags |= ATA_DFLAG_NCQ_SEND_RECV;
@@ -2160,11 +2154,7 @@ static void ata_dev_config_ncq_non_data(struct ata_device *dev)
 	}
 	err_mask = ata_read_log_page(dev, ATA_LOG_NCQ_NON_DATA,
 				     0, ap->sector_buf, 1);
-	if (err_mask) {
-		ata_dev_dbg(dev,
-			    "failed to get NCQ Non-Data Log Emask 0x%x\n",
-			    err_mask);
-	} else {
+	if (!err_mask) {
 		u8 *cmds = dev->ncq_non_data_cmds;
 
 		memcpy(cmds, ap->sector_buf, ATA_LOG_NCQ_NON_DATA_SIZE);
@@ -2181,12 +2171,8 @@ static void ata_dev_config_ncq_prio(struct ata_device *dev)
 				     ATA_LOG_SATA_SETTINGS,
 				     ap->sector_buf,
 				     1);
-	if (err_mask) {
-		ata_dev_dbg(dev,
-			    "failed to get SATA settings log, Emask 0x%x\n",
-			    err_mask);
+	if (err_mask)
 		goto not_supported;
-	}
 
 	if (!(ap->sector_buf[ATA_LOG_NCQ_PRIO_OFFSET] & BIT(3)))
 		goto not_supported;
@@ -2347,11 +2333,8 @@ static void ata_dev_config_trusted(struct ata_device *dev)
 
 	err = ata_read_log_page(dev, ATA_LOG_IDENTIFY_DEVICE, ATA_LOG_SECURITY,
 			ap->sector_buf, 1);
-	if (err) {
-		ata_dev_dbg(dev,
-			    "failed to read Security Log, Emask 0x%x\n", err);
+	if (err)
 		return;
-	}
 
 	trusted_cap = get_unaligned_le64(&ap->sector_buf[40]);
 	if (!(trusted_cap & (1ULL << 63))) {
@@ -2440,12 +2423,8 @@ static void ata_dev_config_devslp(struct ata_device *dev)
 				     ATA_LOG_IDENTIFY_DEVICE,
 				     ATA_LOG_SATA_SETTINGS,
 				     sata_setting, 1);
-	if (err_mask) {
-		ata_dev_dbg(dev,
-			    "failed to get SATA Settings Log, Emask 0x%x\n",
-			    err_mask);
+	if (err_mask)
 		return;
-	}
 
 	dev->flags |= ATA_DFLAG_DEVSLP;
 	for (i = 0; i < ATA_LOG_DEVSLP_SIZE; i++) {
-- 
2.35.3