linux-kernel - [PATCH 4.15 140/146] scsi: qla2xxx: Defer processing of GS IOCB calls

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Date:   Tue, 13 Mar 2018 16:25:07 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Giridhar Malavali <giridhar.malavali@...ium.com>,
        Himanshu Madhani <himanshu.madhani@...ium.com>,
        Hannes Reinecke <hare@...e.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.15 140/146] scsi: qla2xxx: Defer processing of GS IOCB calls

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

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

From: Giridhar Malavali <giridhar.malavali@...ium.com>

commit 5d3300a9b8b122b4743aed5a178bf12c87e2b8c9 upstream.

This patch defers processing of GS IOCB calls from interrupt context to
avoid hardware spinlock recursion.

Following stack trace is seen

? mod_timer+0x193/0x330
? ql_dbg+0xa7/0xf0 [qla2xxx]
_raw_spin_lock_irqsave+0x31/0x40
qla2x00_start_sp+0x3b/0x250 [qla2xxx]
qla24xx_async_gnl+0x1d3/0x240 [qla2xxx]
qla24xx_fcport_handle_login+0x285/0x290 [qla2xxx]
? vprintk_func+0x20/0x50

Fixes: 726b85487067d ("qla2xxx: Add framework for async fabric discovery")
Cc: <stable@...r.kernel.org> # 4.10+
Signed-off-by: Giridhar Malavali <giridhar.malavali@...ium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@...ium.com>
Reviewed-by: Hannes Reinecke <hare@...e.com>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/qla2xxx/qla_init.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -975,7 +975,7 @@ int qla24xx_fcport_handle_login(struct s
 			ql_dbg(ql_dbg_disc, vha, 0x20bd,
 			    "%s %d %8phC post gnl\n",
 			    __func__, __LINE__, fcport->port_name);
-			qla24xx_async_gnl(vha, fcport);
+			qla24xx_post_gnl_work(vha, fcport);
 		} else {
 			ql_dbg(ql_dbg_disc, vha, 0x20bf,
 			    "%s %d %8phC post login\n",
@@ -1143,7 +1143,7 @@ void qla24xx_handle_relogin_event(scsi_q
 		ql_dbg(ql_dbg_disc, vha, 0x20e9, "%s %d %8phC post gidpn\n",
 		    __func__, __LINE__, fcport->port_name);

-		qla24xx_async_gidpn(vha, fcport);
+		qla24xx_post_gidpn_work(vha, fcport);
 		return;
 	}