Patch "scsi: fnic: Avoid sending reset to firmware when another reset is in progress" has been added to the 4.4-stable tree

Patch "scsi: fnic: Avoid sending reset to firmware when another reset is in progress" has been added to the 4.4-stable tree

[gregkh]

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

    scsi: fnic: Avoid sending reset to firmware when another reset is in progress

to the 4.4-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-fnic-avoid-sending-reset-to-firmware-when-another-reset-is-in-progress.patch
and it can be found in the queue-4.4 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 Fri Aug  4 15:30:20 PDT 2017
From: Satish Kharat <satishkh@cisco.com>
Date: Wed, 14 Dec 2016 13:20:41 -0800
Subject: scsi: fnic: Avoid sending reset to firmware when another reset is in progress

From: Satish Kharat <satishkh@cisco.com>


[ Upstream commit 9698b6f473555a722bf81a3371998427d5d27bde ]

This fix is to avoid calling fnic_fw_reset_handler through
fnic_host_reset when a finc reset is alreay in progress.

Signed-off-by: Satish Kharat <satishkh@cisco.com>
Signed-off-by: Sesidhar Baddela <sebaddel@cisco.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/scsi/fnic/fnic.h      |    1 +
 drivers/scsi/fnic/fnic_scsi.c |   16 ++++++++++++++++
 2 files changed, 17 insertions(+)

--- a/drivers/scsi/fnic/fnic.h
+++ b/drivers/scsi/fnic/fnic.h
@@ -248,6 +248,7 @@ struct fnic {
 	struct completion *remove_wait; /* device remove thread blocks */
 
 	atomic_t in_flight;		/* io counter */
+	bool internal_reset_inprogress;
 	u32 _reserved;			/* fill hole */
 	unsigned long state_flags;	/* protected by host lock */
 	enum fnic_state state;
--- a/drivers/scsi/fnic/fnic_scsi.c
+++ b/drivers/scsi/fnic/fnic_scsi.c
@@ -2533,6 +2533,19 @@ int fnic_host_reset(struct scsi_cmnd *sc
 	unsigned long wait_host_tmo;
 	struct Scsi_Host *shost = sc->device->host;
 	struct fc_lport *lp = shost_priv(shost);
+	struct fnic *fnic = lport_priv(lp);
+	unsigned long flags;
+
+	spin_lock_irqsave(&fnic->fnic_lock, flags);
+	if (fnic->internal_reset_inprogress == 0) {
+		fnic->internal_reset_inprogress = 1;
+	} else {
+		spin_unlock_irqrestore(&fnic->fnic_lock, flags);
+		FNIC_SCSI_DBG(KERN_DEBUG, fnic->lport->host,
+			"host reset in progress skipping another host reset\n");
+		return SUCCESS;
+	}
+	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 
 	/*
 	 * If fnic_reset is successful, wait for fabric login to complete
@@ -2553,6 +2566,9 @@ int fnic_host_reset(struct scsi_cmnd *sc
 		}
 	}
 
+	spin_lock_irqsave(&fnic->fnic_lock, flags);
+	fnic->internal_reset_inprogress = 0;
+	spin_unlock_irqrestore(&fnic->fnic_lock, flags);
 	return ret;
 }
 


Patches currently in stable-queue which might be from satishkh@cisco.com are

queue-4.4/scsi-fnic-avoid-sending-reset-to-firmware-when-another-reset-is-in-progress.patch