[PATCH] mci: core: Check return value of dev_add_param_bool

[Wadim Egorov]

Commit 03b59bdb64e83ebcdb9111681775117ebce0e03b changed the
return values of dev_add_param_* to ERR_PTR(-ENOSYS) and broke a few boards.
We have now to care about the return value of dev_add_param_bool() in
mci_register().

Also set the ret variable when dev_add_param_bool() fails.

Signed-off-by: Wadim Egorov <w.egorov at phytec.de>
---
 drivers/mci/mci-core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/mci/mci-core.c b/drivers/mci/mci-core.c
index 8221632..bd5cae2 100644
--- a/drivers/mci/mci-core.c
+++ b/drivers/mci/mci-core.c
@@ -1774,7 +1774,8 @@ int mci_register(struct mci_host *host)
 	mci->param_probe = dev_add_param_bool(&mci->dev, "probe",
 			mci_set_probe, NULL, &mci->probe, mci);
 
-	if (IS_ERR(mci->param_probe)) {
+	if (IS_ERR(mci->param_probe) && PTR_ERR(mci->param_probe) != -ENOSYS) {
+		ret = PTR_ERR(mci->param_probe);
 		dev_dbg(&mci->dev, "Failed to add 'probe' parameter to the MCI device\n");
 		goto err_unregister;
 	}
-- 
1.9.1