[PATCH V2 01/10] mmc: return mmc_of_parse() errors to caller

[Simon Baatz <gmbnomis@gmail.com>]

In addition to just logging errors encountered during DT parsing or
allocating GPIO slots for CD/WP, mmc_of_parse() now returns with an
error.

Signed-off-by: Simon Baatz <gmbnomis@gmail.com>
---
 drivers/mmc/core/host.c  |   24 +++++++++++++++++++-----
 include/linux/mmc/host.h |    2 +-
 2 files changed, 20 insertions(+), 6 deletions(-)

diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
index 2a3593d..45122cc 100644
--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -306,7 +306,7 @@ static inline void mmc_host_clk_sysfs_init(struct mmc_host *host)
  * parse the properties and set respective generic mmc-host flags and
  * parameters.
  */
-void mmc_of_parse(struct mmc_host *host)
+int mmc_of_parse(struct mmc_host *host)
 {
 	struct device_node *np;
 	u32 bus_width;
@@ -315,7 +315,7 @@ void mmc_of_parse(struct mmc_host *host)
 	int len, ret, gpio;
 
 	if (!host->parent || !host->parent->of_node)
-		return;
+		return 0;
 
 	np = host->parent->of_node;
 
@@ -338,6 +338,7 @@ void mmc_of_parse(struct mmc_host *host)
 	default:
 		dev_err(host->parent,
 			"Invalid \"bus-width\" value %ud!\n", bus_width);
+		return -EINVAL;
 	}
 
 	/* f_max is obtained from the optional "max-frequency" property */
@@ -372,13 +373,15 @@ void mmc_of_parse(struct mmc_host *host)
 				gpio_inv_cd = true;
 
 			ret = mmc_gpio_request_cd(host, gpio);
-			if (ret < 0)
+			if (ret < 0) {
 				dev_err(host->parent,
 					"Failed to request CD GPIO #%d: %d!\n",
 					gpio, ret);
-			else
+				return ret;
+			} else {
 				dev_info(host->parent, "Got CD GPIO #%d.\n",
 					 gpio);
+			}
 		}
 
 		if (explicit_inv_cd ^ gpio_inv_cd)
@@ -394,9 +397,14 @@ void mmc_of_parse(struct mmc_host *host)
 			gpio_inv_wp = true;
 
 		ret = mmc_gpio_request_ro(host, gpio);
-		if (ret < 0)
+		if (ret < 0) {
 			dev_err(host->parent,
 				"Failed to request WP GPIO: %d!\n", ret);
+			goto out;
+		} else {
+				dev_info(host->parent, "Got WP GPIO #%d.\n",
+					 gpio);
+		}
 	}
 	if (explicit_inv_wp ^ gpio_inv_wp)
 		host->caps2 |= MMC_CAP2_RO_ACTIVE_HIGH;
@@ -413,6 +421,12 @@ void mmc_of_parse(struct mmc_host *host)
 		host->pm_caps |= MMC_PM_KEEP_POWER;
 	if (of_find_property(np, "enable-sdio-wakeup", &len))
 		host->pm_caps |= MMC_PM_WAKE_SDIO_IRQ;
+
+	return 0;
+
+out:
+	mmc_gpio_free_cd(host);
+	return ret;
 }
 
 EXPORT_SYMBOL(mmc_of_parse);
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index e326ae2..c8c4fbc 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -369,7 +369,7 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *);
 int mmc_add_host(struct mmc_host *);
 void mmc_remove_host(struct mmc_host *);
 void mmc_free_host(struct mmc_host *);
-void mmc_of_parse(struct mmc_host *host);
+int mmc_of_parse(struct mmc_host *host);
 
 static inline void *mmc_priv(struct mmc_host *host)
 {
-- 
1.7.9.5