Patch "scsi: megaraid_sas: unload flag should be set after scsi_remove_host is called" has been added to the 4.15-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    scsi: megaraid_sas: unload flag should be set after scsi_remove_host is called

to the 4.15-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-unload-flag-should-be-set-after-scsi_remove_host-is-called.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Mon Apr  9 10:16:32 CEST 2018
From: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Date: Fri, 5 Jan 2018 05:27:41 -0800
Subject: scsi: megaraid_sas: unload flag should be set after scsi_remove_host is called

From: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>


[ Upstream commit f3f7920b3910171b2999c7dc2335eb9f583e44f2 ]

Issue - Driver returns DID_NO_CONNECT when unload is in progress,
indicated using instance->unload flag. In case of dynamic unload of
driver, this flag is set before calling scsi_remove_host(). While doing
manual driver unload, user will see lots of prints for Sync Cache
command with DID_NO_CONNECT status.

Fix - Set the instance->unload flag after scsi_remove_host(). Allow
device removal process to be completed and do not block any command
before that.  SCSI commands (like SYNC_CACHE) are received (as part of
scsi_remove_host) by driver during unload will be submitted further down
to the drives.

Signed-off-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/scsi/megaraid/megaraid_sas_base.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -6822,7 +6822,6 @@ static void megasas_detach_one(struct pc
 	u32 pd_seq_map_sz;
 
 	instance = pci_get_drvdata(pdev);
-	instance->unload = 1;
 	host = instance->host;
 	fusion = instance->ctrl_context;
 
@@ -6833,6 +6832,7 @@ static void megasas_detach_one(struct pc
 	if (instance->fw_crash_state != UNAVAILABLE)
 		megasas_free_host_crash_buffer(instance);
 	scsi_remove_host(instance->host);
+	instance->unload = 1;
 
 	if (megasas_wait_for_adapter_operational(instance))
 		goto skip_firing_dcmds;


Patches currently in stable-queue which might be from shivasharan.srikanteshwara@broadcom.com are

queue-4.15/scsi-megaraid_sas-error-handling-for-invalid-ldcount-provided-by-firmware-in-raid-map.patch
queue-4.15/scsi-megaraid_sas-unload-flag-should-be-set-after-scsi_remove_host-is-called.patch