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authorDaniel Mack <zonque@gmail.com>2013-03-04 00:57:20 +0100
committerDavid Woodhouse <David.Woodhouse@intel.com>2013-04-05 12:57:18 +0100
commitad2457894c272279bf73ca46ae5ea5de4876d2a0 (patch)
tree11675f958813b5a7cefa1771212eaed57032acb1 /drivers/mtd/devices
parent0cca9fbf5d0a65fb536d38427f48460fda1f2e99 (diff)
downloadlinaro-lsk-ad2457894c272279bf73ca46ae5ea5de4876d2a0.tar.gz
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>
Diffstat (limited to 'drivers/mtd/devices')
-rw-r--r--drivers/mtd/devices/elm.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/mtd/devices/elm.c b/drivers/mtd/devices/elm.c
index 2ec5da9ee24..dccef9fdc1f 100644
--- a/drivers/mtd/devices/elm.c
+++ b/drivers/mtd/devices/elm.c
@@ -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);