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| author | Pankaj Dubey <pankaj.dubey@samsung.com> | 2014-09-18 15:12:20 +0530 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2014-09-18 10:55:31 -0700 |
| commit | 6e64b6ccc1e46932768e3bb8974fc2e5589bca7a (patch) | |
| tree | d051e0d1e325837e45a1bf3427144d8121dffa35 /drivers/base/regmap/regmap.c | |
| parent | cf673fbc6342b1c2310cdfdc4ed99f18f866b8e4 (diff) | |
| download | blackbird-obmc-linux-6e64b6ccc1e46932768e3bb8974fc2e5589bca7a.tar.gz blackbird-obmc-linux-6e64b6ccc1e46932768e3bb8974fc2e5589bca7a.zip | |
regmap: fix NULL pointer dereference in regmap_get_val_endian
Recents commits for getting reg endianness causing NULL pointer
dereference if dev is passed NULL in regmap_init_mmio. This patch
fixes this issue, and allows to parse reg endianness only if dev
and dev->of_node exist.
Signed-off-by: Pankaj Dubey <pankaj.dubey@samsung.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base/regmap/regmap.c')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index 01ae4b829360..fd7ae9a10c4d 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -477,7 +477,7 @@ static enum regmap_endian regmap_get_val_endian(struct device *dev, const struct regmap_bus *bus, const struct regmap_config *config) { - struct device_node *np = dev->of_node; + struct device_node *np; enum regmap_endian endian; /* Retrieve the endianness specification from the regmap config */ @@ -487,15 +487,20 @@ static enum regmap_endian regmap_get_val_endian(struct device *dev, if (endian != REGMAP_ENDIAN_DEFAULT) return endian; - /* Parse the device's DT node for an endianness specification */ - if (of_property_read_bool(np, "big-endian")) - endian = REGMAP_ENDIAN_BIG; - else if (of_property_read_bool(np, "little-endian")) - endian = REGMAP_ENDIAN_LITTLE; + /* If the dev and dev->of_node exist try to get endianness from DT */ + if (dev && dev->of_node) { + np = dev->of_node; - /* If the endianness was specified in DT, use that */ - if (endian != REGMAP_ENDIAN_DEFAULT) - return endian; + /* Parse the device's DT node for an endianness specification */ + if (of_property_read_bool(np, "big-endian")) + endian = REGMAP_ENDIAN_BIG; + else if (of_property_read_bool(np, "little-endian")) + endian = REGMAP_ENDIAN_LITTLE; + + /* If the endianness was specified in DT, use that */ + if (endian != REGMAP_ENDIAN_DEFAULT) + return endian; + } /* Retrieve the endianness specification from the bus config */ if (bus && bus->val_format_endian_default) |
