linux-kernel - [PATCH AUTOSEL for 4.4 109/167] mtd: nand: gpmi: Fix gpmi_nand

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Date:   Mon, 19 Mar 2018 16:07:38 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL for 4.4 109/167] mtd: nand: gpmi: Fix gpmi_nand_init()
 error path

From: Boris Brezillon <boris.brezillon@...e-electrons.com>

[ Upstream commit 4d02423e9afe6c46142ce98bbcaf5167316dbfbf ]

The GPMI driver is wrongly assuming that nand_release() can safely be
called on an uninitialized/unregistered NAND device.

Add a new err_nand_cleanup label in the error path and only execute if
nand_scan_tail() succeeded.

Note that we now call nand_cleanup() instead of nand_release()
(nand_release() is actually grouping the mtd_device_unregister() and
nand_cleanup() in one call) because there's no point in trying to
unregister a device that has never been registered.

Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
Reviewed-by: Marek Vasut <marek.vasut@...il.com>
Acked-by: Han Xu <han.xu@....com>
Reviewed-by: Marek Vasut <marek.vasut@...il.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
index e2a239c1f40b..411888e44969 100644
--- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
@@ -1949,19 +1949,21 @@ static int gpmi_nand_init(struct gpmi_nand_data *this)
 
 	ret = nand_boot_init(this);
 	if (ret)
-		goto err_out;
+		goto err_nand_cleanup;
 	ret = chip->scan_bbt(mtd);
 	if (ret)
-		goto err_out;
+		goto err_nand_cleanup;
 
 	ppdata.of_node = this->pdev->dev.of_node;
 	ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
 	if (ret)
-		goto err_out;
+		goto err_nand_cleanup;
 	return 0;
 
+err_nand_cleanup:
+	nand_cleanup(chip);
 err_out:
-	gpmi_nand_exit(this);
+	gpmi_free_dma_buffer(this);
 	return ret;
 }
 
-- 
2.14.1