[PATCH] fpga altera-hps2fpga: disable/unprepare clock on error in alt_fpga_bridge_probe()

From: Tobias Klauser
Date: Tue Apr 11 2017 - 05:23:09 EST


If either _alt_hps2fpga_enable_set() or fpga_bridge_register() fail in
alt_fpga_bridge_probe(), the clock remains enabled and prepared. Also,
in the error path for _alt_hps2fpga_enable_set() a call to
fpga_bridge_unregister() is made even though the bridge was not
registered yet.

Remove the unnecessary call to fpga_bridge_unregister() and call
clk_disable_unprepare() in both error paths in order to make sure the
clock gets properly disabled and unprepared.

Signed-off-by: Tobias Klauser <tklauser@xxxxxxxxxx>
---
drivers/fpga/altera-hps2fpga.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/fpga/altera-hps2fpga.c b/drivers/fpga/altera-hps2fpga.c
index 4b354c79be31..3066b805f2d0 100644
--- a/drivers/fpga/altera-hps2fpga.c
+++ b/drivers/fpga/altera-hps2fpga.c
@@ -181,15 +181,18 @@ static int alt_fpga_bridge_probe(struct platform_device *pdev)
(enable ? "enabling" : "disabling"));

ret = _alt_hps2fpga_enable_set(priv, enable);
- if (ret) {
- fpga_bridge_unregister(&pdev->dev);
- return ret;
- }
+ if (ret)
+ goto err;
}
}

- return fpga_bridge_register(dev, priv->name, &altera_hps2fpga_br_ops,
- priv);
+ ret = fpga_bridge_register(dev, priv->name, &altera_hps2fpga_br_ops,
+ priv);
+err:
+ if (ret)
+ clk_disable_unprepare(priv->clk);
+
+ return ret;
}

static int alt_fpga_bridge_remove(struct platform_device *pdev)
--
2.12.2