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

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/mtd/devices/elm.c
View File

@ -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);

5
drivers/mtd/nand/omap2.c
View File

@ -1701,8 +1701,9 @@ static int omap3_init_bch(struct mtd_info *mtd, int ecc_opt)
elm_node = of_find_node_by_phandle(be32_to_cpup(parp));
pdev = of_find_device_by_node(elm_node);
info->elm_dev = &pdev->dev;
elm_config(info->elm_dev, bch_type);
info->is_elm_used = true;
if (elm_config(info->elm_dev, bch_type) == 0)
info->is_elm_used = true;
}
if (info->is_elm_used && (mtd->writesize <= 4096)) {

2
include/linux/platform_data/elm.h
View File

@ -50,5 +50,5 @@ struct elm_errorvec {
void elm_decode_bch_error_page(struct device *dev, u8 *ecc_calc,
struct elm_errorvec *err_vec);
void elm_config(struct device *dev, enum bch_ecc bch_type);
int elm_config(struct device *dev, enum bch_ecc bch_type);
#endif /* __ELM_H */