This is a note to let you know that I've just added the patch titled
scsi: megaraid_sas: Target with invalid LUN ID is deleted during scan
to the 5.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
scsi-megaraid_sas-target-with-invalid-lun-id-is-dele.patch
and it can be found in the queue-5.17 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 85239c22d0be1dc29ece94e74057d8058cdf800c
Author: Chandrakanth patil <chandrakanth.patil@xxxxxxxxxxxx>
Date: Thu Mar 24 02:47:11 2022 -0700
scsi: megaraid_sas: Target with invalid LUN ID is deleted during scan
[ Upstream commit 56495f295d8e021f77d065b890fc0100e3f9f6d8 ]
The megaraid_sas driver supports single LUN for RAID devices. That is LUN
0. All other LUNs are unsupported. When a device scan on a logical target
with invalid LUN number is invoked through sysfs, that target ends up
getting removed.
Add LUN ID validation in the slave destroy function to avoid the target
deletion.
Link: https://lore.kernel.org/r/20220324094711.48833-1-chandrakanth.patil@xxxxxxxxxxxx
Signed-off-by: Chandrakanth patil <chandrakanth.patil@xxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/scsi/megaraid/megaraid_sas.h b/drivers/scsi/megaraid/megaraid_sas.h
index 2c9d1b796475..ae2aef9ba8cf 100644
--- a/drivers/scsi/megaraid/megaraid_sas.h
+++ b/drivers/scsi/megaraid/megaraid_sas.h
@@ -2558,6 +2558,9 @@ struct megasas_instance_template {
#define MEGASAS_IS_LOGICAL(sdev) \
((sdev->channel < MEGASAS_MAX_PD_CHANNELS) ? 0 : 1)
+#define MEGASAS_IS_LUN_VALID(sdev) \
+ (((sdev)->lun == 0) ? 1 : 0)
+
#define MEGASAS_DEV_INDEX(scp) \
(((scp->device->channel % 2) * MEGASAS_MAX_DEV_PER_CHANNEL) + \
scp->device->id)
diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index 82e1e24257bc..ca563498dcdb 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -2126,6 +2126,9 @@ static int megasas_slave_alloc(struct scsi_device *sdev)
goto scan_target;
}
return -ENXIO;
+ } else if (!MEGASAS_IS_LUN_VALID(sdev)) {
+ sdev_printk(KERN_INFO, sdev, "%s: invalid LUN\n", __func__);
+ return -ENXIO;
}
scan_target:
@@ -2156,6 +2159,10 @@ static void megasas_slave_destroy(struct scsi_device *sdev)
instance = megasas_lookup_instance(sdev->host->host_no);
if (MEGASAS_IS_LOGICAL(sdev)) {
+ if (!MEGASAS_IS_LUN_VALID(sdev)) {
+ sdev_printk(KERN_INFO, sdev, "%s: invalid LUN\n", __func__);
+ return;
+ }
ld_tgt_id = MEGASAS_TARGET_ID(sdev);
instance->ld_tgtid_status[ld_tgt_id] = LD_TARGET_ID_DELETED;
if (megasas_dbg_lvl & LD_PD_DEBUG)
