[PATCH 5.15 214/279] ata: libata: add missing ata_identify_page_supported() calls

Greg Kroah-Hartman
2021-11-24T14:03:12Z

From: Damien Le Moal <damien.lemoal@opensource.wdc.com>

commit 06f6c4c6c3e8354dceddd77bd58f9a7a84c67246 upstream.

ata_dev_config_ncq_prio() and ata_dev_config_devslp() both access pages
of the IDENTIFY DEVICE data log. Before calling ata_read_log_page(),
make sure to check for the existence of the IDENTIFY DEVICE data log and
of the log page accessed using ata_identify_page_supported(). This
avoids useless error messages from ata_read_log_page() and failures with
some LLDD scsi drivers using libsas.

Reported-by: Nikolay <knv418@gmail.com>
Cc: stable@kernel.org # 5.15
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Tested-by: Matthew Perkowski <mgperkow@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/ata/libata-core.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -2167,6 +2167,9 @@ static void ata_dev_config_ncq_prio(stru
struct ata_port *ap = dev->link->ap;
unsigned int err_mask;

+ if (!ata_identify_page_supported(dev, ATA_LOG_SATA_SETTINGS))
+ return;
+
err_mask = ata_read_log_page(dev,
ATA_LOG_IDENTIFY_DEVICE,
ATA_LOG_SATA_SETTINGS,
@@ -2443,7 +2446,8 @@ static void ata_dev_config_devslp(struct
* Check device sleep capability. Get DevSlp timing variables
* from SATA Settings page of Identify Device Data Log.
*/
- if (!ata_id_has_devslp(dev->id))
+ if (!ata_id_has_devslp(dev->id) ||
+ !ata_identify_page_supported(dev, ATA_LOG_SATA_SETTINGS))
return;

err_mask = ata_read_log_page(dev,