linux-kernel - [PATCH AUTOSEL for 4.14 14/51] mmc: tmio: check mmc_regulator_get

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Message-ID: <20171122222526.20021-14-alexander.levin@verizon.com>
Date:   Wed, 22 Nov 2017 22:25:39 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Fabrizio Castro <fabrizio.castro@...renesas.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 14/51] mmc: tmio: check
 mmc_regulator_get_supply return value

From: Fabrizio Castro <fabrizio.castro@...renesas.com>

[ Upstream commit a3d95d1d4007b1fefd6d8b12db26fda05de05cfb ]

mmc_regulator_get_supply returns -EPROBE_DEFER if either vmmc or
vqmmc regulators had their probing deferred.
vqmmc regulator is needed by UHS to work properly, therefore this
patch checks the value returned by mmc_regulator_get_supply to
make sure we have a reference to both vmmc and vqmmc (if found in
the DT).

Signed-off-by: Fabrizio Castro <fabrizio.castro@...renesas.com>
Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Tested-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/mmc/host/tmio_mmc_core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index 9c4e6199b854..3a6d49f07e22 100644
--- a/drivers/mmc/host/tmio_mmc_core.c
+++ b/drivers/mmc/host/tmio_mmc_core.c
@@ -1113,8 +1113,11 @@ static int tmio_mmc_init_ocr(struct tmio_mmc_host *host)
 {
 	struct tmio_mmc_data *pdata = host->pdata;
 	struct mmc_host *mmc = host->mmc;
+	int err;
 
-	mmc_regulator_get_supply(mmc);
+	err = mmc_regulator_get_supply(mmc);
+	if (err)
+		return err;
 
 	/* use ocr_mask if no regulator */
 	if (!mmc->ocr_avail)
-- 
2.11.0