linux-kernel - [PATCH 4.4 043/112] scsi: zfcp: spin_lock

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Message-Id: <20161026122306.616743173@linuxfoundation.org>
Date:   Wed, 26 Oct 2016 14:22:26 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Steffen Maier <maier@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.4 043/112] scsi: zfcp: spin_lock_irqsave() is not nestable

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@...cle.com>

commit e7cb08e894a0b876443ef8fdb0706575dc00a5d2 upstream.

We accidentally overwrite the original saved value of "flags" so that we
can't re-enable IRQs at the end of the function.  Presumably this
function is mostly called with IRQs disabled or it would be obvious in
testing.

Fixes: aceeffbb59bb ("zfcp: trace full payload of all SAN records (req,resp,iels)")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Steffen Maier <maier@...ux.vnet.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/s390/scsi/zfcp_dbf.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/s390/scsi/zfcp_dbf.c
+++ b/drivers/s390/scsi/zfcp_dbf.c
@@ -384,7 +384,7 @@ void zfcp_dbf_san(char *tag, struct zfcp
 	/* if (len > rec_len):
 	 * dump data up to cap_len ignoring small duplicate in rec->payload
 	 */
-	spin_lock_irqsave(&dbf->pay_lock, flags);
+	spin_lock(&dbf->pay_lock);
 	memset(payload, 0, sizeof(*payload));
 	memcpy(payload->area, paytag, ZFCP_DBF_TAG_LEN);
 	payload->fsf_req_id = req_id;