[PATCH AUTOSEL for 4.4 109/167] mtd: nand: gpmi: Fix gpmi_nand_init() error path

Sasha Levin
2018-03-19T17:15:10Z

From: Boris Brezillon <boris.brezillon@free-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@free-electrons.com>
Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
Acked-by: Han Xu <han.xu@nxp.com>
Reviewed-by: Marek Vasut <marek.vasut@gmail.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.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