linux-kernel - [PATCH 1/2] soc: fsl: dpio: cleanup the cpu array on dpaa2_io

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Date:   Mon, 5 Nov 2018 09:30:32 +0000
From:   Ioana Ciornei <ioana.ciornei@....com>
To:     Roy Pledge <roy.pledge@....com>,
        Youri Querry <youri.querry_1@....com>,
        Leo Li <leoyang.li@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
CC:     Ioana Ciocoi Radulescu <ruxandra.radulescu@....com>,
        Horia Geanta <horia.geanta@....com>,
        Ioana Ciornei <ioana.ciornei@....com>
Subject: [PATCH 1/2] soc: fsl: dpio: cleanup the cpu array on dpaa2_io_down

The dpio_by_cpu array should not contain a reference to a freed dpaa2_io
object. This patch adds the necessary cleanup in dpaa2_io_down.

Signed-off-by: Ioana Ciornei <ioana.ciornei@....com>
---
 drivers/soc/fsl/dpio/dpio-service.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/soc/fsl/dpio/dpio-service.c b/drivers/soc/fsl/dpio/dpio-service.c
index 9b17f72..21c3e32 100644
--- a/drivers/soc/fsl/dpio/dpio-service.c
+++ b/drivers/soc/fsl/dpio/dpio-service.c
@@ -160,6 +160,11 @@ struct dpaa2_io *dpaa2_io_create(const struct dpaa2_io_desc *desc)
  */
 void dpaa2_io_down(struct dpaa2_io *d)
 {
+	spin_lock(&dpio_list_lock);
+	dpio_by_cpu[d->dpio_desc.cpu] = NULL;
+	list_del(&d->node);
+	spin_unlock(&dpio_list_lock);
+
 	kfree(d);
 }
 
-- 
1.9.1