[PATCH 4.2 224/258] mmc: core: Dont return an error for CD/WP GPIOs when GPIOLIB is unset

From: Greg Kroah-Hartman
Date: Sat Oct 17 2015 - 23:48:22 EST


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

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

From: Ulf Hansson <ulf.hansson@xxxxxxxxxx>

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

---
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
@@ -457,7 +457,7 @@ 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;

/*
@@ -481,7 +481,7 @@ 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;

if (of_property_read_bool(np, "disable-wp"))


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/