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| author | Charles Keepax <ckeepax@opensource.cirrus.com> | 2018-02-22 12:59:10 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2018-02-26 11:00:30 +0000 |
| commit | 0812d8ffa9955251ba0077488d4408d8987ec091 (patch) | |
| tree | 8c2fc9f9cae2b6690684b85002eeb1c77c5f996f /drivers/base | |
| parent | 2936e846c4e6df2df0dd6bcade3d269e17a707d1 (diff) | |
| download | linux-0812d8ffa9955251ba0077488d4408d8987ec091.tar.gz linux-0812d8ffa9955251ba0077488d4408d8987ec091.tar.bz2 linux-0812d8ffa9955251ba0077488d4408d8987ec091.zip | |
regmap: Format data for raw write in regmap_bulk_write
In the case were the bulk transaction is split up into smaller chunks
data is passed directly to regmap_raw_write. However regmap_bulk_write
uses data in host endian and regmap_raw_write expects data in device
endian. As such if the host and device differ in endian the wrong data
will be written to the device. Correct this issue using a similar
approach to the single raw write case below it, duplicate the data
into a new buffer and use parse_inplace to format the data correctly.
Fixes: adaac459759d ("regmap: Introduce max_raw_read/write for regmap_bulk_read/write")
Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/base')
| -rw-r--r-- | drivers/base/regmap/regmap.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c index f5d653663626..8fe6e08fa41e 100644 --- a/drivers/base/regmap/regmap.c +++ b/drivers/base/regmap/regmap.c @@ -2003,6 +2003,17 @@ out: int chunk_stride = map->reg_stride; size_t chunk_size = val_bytes; size_t chunk_count = val_count; + void *wval; + + if (!val_count) + return -EINVAL; + + wval = kmemdup(val, val_count * val_bytes, map->alloc_flags); + if (!wval) + return -ENOMEM; + + for (i = 0; i < val_count * val_bytes; i += val_bytes) + map->format.parse_inplace(wval + i); if (!map->use_single_write) { chunk_size = map->max_raw_write; @@ -2017,7 +2028,7 @@ out: for (i = 0; i < chunk_count; i++) { ret = _regmap_raw_write(map, reg + (i * chunk_stride), - val + (i * chunk_size), + wval + (i * chunk_size), chunk_size); if (ret) break; @@ -2026,10 +2037,12 @@ out: /* Write remaining bytes */ if (!ret && chunk_size * i < total_size) { ret = _regmap_raw_write(map, reg + (i * chunk_stride), - val + (i * chunk_size), + wval + (i * chunk_size), total_size - i * chunk_size); } map->unlock(map->lock_arg); + + kfree(wval); } else { void *wval; |