mtd: mxc_nand: fix unbalanced clk_disable() in error path

If nand_scan_ident() or nand_scan_tail() fails, the NAND chip may have
been deselected and the clock already disabled. Thus, check 'clk_act'
in the error path to decide whether the clock still needs to be
disabled.

This fixes a:
|WARNING: at drivers/clk/clk.c:472 __clk_disable+0x3c/0x78()

Signed-off-by: Lothar Waßmann <LW@KARO-electronics.de>
Acked-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 4aef6a355d54..ab0fe383c50b 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -1533,7 +1533,8 @@ static int mxcnd_probe(struct platform_device *pdev)
         return 0;
 
 escan:
-        clk_disable_unprepare(host->clk);
+        if (host->clk_act)
+                clk_disable_unprepare(host->clk);
 
         return err;
 }