mmc: sdhci: Don't ignore regulator_enable() return value

Fixes:
/git/arm-soc/drivers/mmc/host/sdhci.c: In function 'sdhci_add_host':
/git/arm-soc/drivers/mmc/host/sdhci.c:2910:19: warning: ignoring
return value of 'regulator_enable', declared with attribute
warn_unused_result [-Wunused-result]

Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Chris Ball <cjb@laptop.org>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 81d52942677c..2ea429c27714 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2939,12 +2939,17 @@ int sdhci_add_host(struct sdhci_host *host)
                         host->vqmmc = NULL;
                 }
         } else {
-                regulator_enable(host->vqmmc);
+                ret = regulator_enable(host->vqmmc);
                 if (!regulator_is_supported_voltage(host->vqmmc, 1700000,
                         1950000))
                         caps[1] &= ~(SDHCI_SUPPORT_SDR104 |
                                         SDHCI_SUPPORT_SDR50 |
                                         SDHCI_SUPPORT_DDR50);
+                if (ret) {
+                        pr_warn("%s: Failed to enable vqmmc regulator: %d\n",
+                                mmc_hostname(mmc), ret);
+                        host->vqmmc = NULL;
+                }
         }
 
         if (host->quirks2 & SDHCI_QUIRK2_NO_1_8_V)