linux-kernel - [PATCH 4.4 019/131] mmc: core: shut up "voltage-ranges unspecified" pr

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Date:   Mon,  1 Apr 2019 19:01:29 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Russell King <rmk+kernel@....linux.org.uk>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 4.4 019/131] mmc: core: shut up "voltage-ranges unspecified" pr_info()

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Russell King <rmk+kernel@....linux.org.uk>

commit 10a16a01d8f72e80f4780e40cf3122f4caffa411 upstream.

Each time a driver such as sdhci-esdhc-imx is probed, we get a info
printk complaining that the DT voltage-ranges property has not been
specified.

However, the DT binding specifically says that the voltage-ranges
property is optional.  That means we should not be complaining that
DT hasn't specified this property: by indicating that it's optional,
it is valid not to have the property in DT.

Silence the warning if the property is missing.

Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/core/core.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1220,8 +1220,12 @@ int mmc_of_parse_voltage(struct device_n
 
 	voltage_ranges = of_get_property(np, "voltage-ranges", &num_ranges);
 	num_ranges = num_ranges / sizeof(*voltage_ranges) / 2;
-	if (!voltage_ranges || !num_ranges) {
-		pr_info("%s: voltage-ranges unspecified\n", np->full_name);
+	if (!voltage_ranges) {
+		pr_debug("%s: voltage-ranges unspecified\n", np->full_name);
+		return -EINVAL;
+	}
+	if (!num_ranges) {
+		pr_err("%s: voltage-ranges empty\n", np->full_name);
 		return -EINVAL;
 	}