linux-kernel - [PATCH 4.1 175/202] mmc: core: Dont return an error for CD/WP GPIOs when GPIOLIB is unset

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Date:	Sat, 17 Oct 2015 18:59:18 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Michal Simek <michal.simek@...inx.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Venu Byravarasu <vbyravarasu@...dia.com>
Subject: [PATCH 4.1 175/202] mmc: core: Dont return an error for CD/WP GPIOs when GPIOLIB is unset

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

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

From: Ulf Hansson <ulf.hansson@...aro.org>

commit 43934ece2ea72c1dd279c0b0478c1a036d5d77ee upstream.

When CONFIG_GPIOLIB is unset, its stubs will return -ENOSYS. That means
when the mmc core parses DT for CD/WP GPIOs via mmc_of_parse(), -ENOSYS
becomes propagated to the caller. Typically this means that the mmc host
driver fails to probe.

As the CD/WP GPIOs are already treated as optional, let's extend that to
cover the case when CONFIG_GPIOLIB is unset.

Reported-by: Michal Simek <michal.simek@...inx.com>
Fixes: 16b23787fc70 ("mmc: sdhci-of-arasan: Call OF parsing for MMC")
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Tested-by: Michal Simek <michal.simek@...inx.com>
Acked-by: Venu Byravarasu <vbyravarasu@...dia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/mmc/core/host.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/mmc/core/host.c
+++ b/drivers/mmc/core/host.c
@@ -373,7 +373,7 @@ int mmc_of_parse(struct mmc_host *host)
 					   0, &cd_gpio_invert);
 		if (!ret)
 			dev_info(host->parent, "Got CD GPIO\n");
-		else if (ret != -ENOENT)
+		else if (ret != -ENOENT && ret != -ENOSYS)
 			return ret;
 
 		/*
@@ -397,7 +397,7 @@ int mmc_of_parse(struct mmc_host *host)
 	ret = mmc_gpiod_request_ro(host, "wp", 0, false, 0, &ro_gpio_invert);
 	if (!ret)
 		dev_info(host->parent, "Got WP GPIO\n");
-	else if (ret != -ENOENT)
+	else if (ret != -ENOENT && ret != -ENOSYS)
 		return ret;
 
 	/* See the comment on CD inversion above */


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