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mmc: cavium: Prevent crash with incomplete DT 

In case the DT specifies neither a regulator nor a gpio
for the shared power the driver will crash accessing the regulator.
Prevent the crash by checking the regulator before use.

Use mmc_regulator_get_supply() instead of open coding the same
logic.

Signed-off-by: Jan Glauber <jglauber@cavium.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Jan Glauber 2017-05-22 13:09:19 +02:00 committed by Ulf Hansson
parent 899e4aad15
commit 9e7b9a25e1
1 changed files with 10 additions and 15 deletions
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25
drivers/mmc/host/cavium.c
View File

@ -839,14 +839,14 @@ static void cvm_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
cvm_mmc_reset_bus(slot);
if (host->global_pwr_gpiod)
host->set_shared_power(host, 0);
else
else if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
break;
case MMC_POWER_UP:
if (host->global_pwr_gpiod)
host->set_shared_power(host, 1);
else
else if (!IS_ERR(mmc->supply.vmmc))
mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, ios->vdd);
break;
}
@ -968,20 +968,15 @@ static int cvm_mmc_of_parse(struct device *dev, struct cvm_mmc_slot *slot)
return -EINVAL;
}
mmc->supply.vmmc = devm_regulator_get_optional(dev, "vmmc");
if (IS_ERR(mmc->supply.vmmc)) {
if (PTR_ERR(mmc->supply.vmmc) == -EPROBE_DEFER)
return -EPROBE_DEFER;
/*
* Legacy Octeon firmware has no regulator entry, fall-back to
* a hard-coded voltage to get a sane OCR.
*/
ret = mmc_regulator_get_supply(mmc);
if (ret == -EPROBE_DEFER)
return ret;
/*
* Legacy Octeon firmware has no regulator entry, fall-back to
* a hard-coded voltage to get a sane OCR.
*/
if (IS_ERR(mmc->supply.vmmc))
mmc->ocr_avail = MMC_VDD_32_33 | MMC_VDD_33_34;
} else {
ret = mmc_regulator_get_ocrmask(mmc->supply.vmmc);
if (ret > 0)
mmc->ocr_avail = ret;
}
/* Common MMC bindings */
ret = mmc_of_parse(mmc);