[PATCH AUTOSEL 5.10 10/20] scsi: core: Avoid printing an error if target_alloc() returns -ENXIO

From: Sasha Levin
Date: Tue Aug 10 2021 - 10:17:55 EST

From: Sreekanth Reddy <sreekanth.reddy@xxxxxxxxxxxx>

[ Upstream commit 70edd2e6f652f67d854981fd67f9ad0f1deaea92 ]

Avoid printing a 'target allocation failed' error if the driver
target_alloc() callback function returns -ENXIO. This return value
indicates that the corresponding H:C:T:L entry is empty.

Removing this error reduces the scan time if the user issues SCAN_WILD_CARD
scan operation through sysfs parameter on a host with a lot of empty
H:C:T:L entries.

Avoiding the printk on -ENXIO matches the behavior of the other callback
functions during scanning.

Link: https://lore.kernel.org/r/20210726115402.1936-1-sreekanth.reddy@xxxxxxxxxxxx
Signed-off-by: Sreekanth Reddy <sreekanth.reddy@xxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/scsi/scsi_scan.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 9af50e6f94c4..8e474b145249 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -453,7 +453,8 @@ static struct scsi_target *scsi_alloc_target(struct device *parent,
error = shost->hostt->target_alloc(starget);

if(error) {
- dev_printk(KERN_ERR, dev, "target allocation failed, error %d\n", error);
+ if (error != -ENXIO)
+ dev_err(dev, "target allocation failed, error %d\n", error);
/* don't want scsi_target_reap to do the final
* put because it will be under the host lock */