linux-kernel - [PATCH] MMC/omap_hsmmc: handle failure of regulator

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Date:	Mon, 30 Jul 2012 10:12:45 +1000
From:	NeilBrown <neilb@...e.de>
To:	Chris Ball <cjb@...top.org>, Venkatraman S <svenkatr@...com>,
	Balaji T K <balajitk@...com>, Rajendra Nayak <rnayak@...com>
Cc:	linux-omap@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] MMC/omap_hsmmc: handle failure of regulator_get better.


1/ if regulator_get fails, return an error.  This is important
   if it failed with EPROBE_DEFER, as the probe needs to be
   deferred.

2/ Don't set .set_power until the regulator has been found, or
   the deferred probe will not bother calling omap_hsmmc_reg_get().

Signed-off-by: NeilBrown <neilb@...e.de>

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 389a3ee..f052c29 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -299,12 +299,12 @@ static int omap_hsmmc_reg_get(struct omap_hsmmc_host *host)
 	struct regulator *reg;
 	int ocr_value = 0;
 
-	mmc_slot(host).set_power = omap_hsmmc_set_power;
-
 	reg = regulator_get(host->dev, "vmmc");
 	if (IS_ERR(reg)) {
 		dev_dbg(host->dev, "vmmc regulator missing\n");
+		return PTR_ERR(reg);
 	} else {
+		mmc_slot(host).set_power = omap_hsmmc_set_power;
 		host->vcc = reg;
 		ocr_value = mmc_regulator_get_ocrmask(reg);
 		if (!mmc_slot(host).ocr_mask) {

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