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mtd: devices: elm: check for device's presence before configuration

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In case the driver is not probed - due to config mismatches or errors
in the DTS files - dev_get_drvdata() returns NULL, leading to an Ooops
during boot.

Make elm_config() return an error in such cases to propagate the error
up to the user, so it can fall back to software mode.

Signed-off-by: Daniel Mack <zonque@gmail.com>
Acked-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Daniel Mack
2013-03-04 00:57:20 +01:00
committed by David Woodhouse
parent 0cca9fbf5d
commit ad2457894c
3 changed files with 12 additions and 4 deletions
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9
drivers/mtd/devices/elm.c
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@@ -81,14 +81,21 @@ static u32 elm_read_reg(struct elm_info *info, int offset)
* @dev: ELM device
* @bch_type: Type of BCH ecc
*/
void elm_config(struct device *dev, enum bch_ecc bch_type)
int elm_config(struct device *dev, enum bch_ecc bch_type)
{
u32 reg_val;
struct elm_info *info = dev_get_drvdata(dev);
if (!info) {
dev_err(dev, "Unable to configure elm - device not probed?\n");
return -ENODEV;
}
reg_val = (bch_type & ECC_BCH_LEVEL_MASK) | (ELM_ECC_SIZE << 16);
elm_write_reg(info, ELM_LOCATION_CONFIG, reg_val);
info->bch_type = bch_type;
return 0;
}
EXPORT_SYMBOL(elm_config);