linux-kernel - [PATCH 4.9 54/56] net: gianfar_ptp: move set

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Date:   Fri,  2 Mar 2018 09:51:40 +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, Yangbo Lu <yangbo.lu@....com>,
        Richard Cochran <richardcochran@...il.com>,
        Fabio Estevam <fabio.estevam@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 54/56] net: gianfar_ptp: move set_fipers() to spinlock protecting area

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

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

From: Yangbo Lu <yangbo.lu@....com>


[ Upstream commit 11d827a993a969c3c6ec56758ff63a44ba19b466 ]

set_fipers() calling should be protected by spinlock in
case that any interrupt breaks related registers setting
and the function we expect. This patch is to move set_fipers()
to spinlock protecting area in ptp_gianfar_adjtime().

Signed-off-by: Yangbo Lu <yangbo.lu@....com>
Acked-by: Richard Cochran <richardcochran@...il.com>
Reviewed-by: Fabio Estevam <fabio.estevam@....com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/freescale/gianfar_ptp.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/ethernet/freescale/gianfar_ptp.c
+++ b/drivers/net/ethernet/freescale/gianfar_ptp.c
@@ -314,11 +314,10 @@ static int ptp_gianfar_adjtime(struct pt
 	now = tmr_cnt_read(etsects);
 	now += delta;
 	tmr_cnt_write(etsects, now);
+	set_fipers(etsects);
 
 	spin_unlock_irqrestore(&etsects->lock, flags);
 
-	set_fipers(etsects);
-
 	return 0;
 }