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iio: temperature: ltc2983: make bulk write buffer DMA-safe 

[ Upstream commit 5e01762139 ]

regmap_bulk_write() does not guarantee implicit DMA-safety,
even though the current implementation duplicates the given
buffer. Do not rely on it.

Fixes: f110f3188e ("iio: temperature: Add support for LTC2983")
Signed-off-by: Cosmin Tanislav <cosmin.tanislav@analog.com>
Link: https://lore.kernel.org/r/20221103130041.2153295-2-demonsingur@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Cosmin Tanislav 2022-11-03 15:00:29 +02:00 committed by Greg Kroah-Hartman
parent 22511eefa6
commit 994243de7a
1 changed files with 5 additions and 5 deletions
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10
drivers/iio/temperature/ltc2983.c
View File

@ -205,6 +205,7 @@ struct ltc2983_data {
* Holds the converted temperature
*/
__be32 temp ____cacheline_aligned;
__be32 chan_val;
};
struct ltc2983_sensor {
@ -309,19 +310,18 @@ static int __ltc2983_fault_handler(const struct ltc2983_data *st,
return 0;
}
static int __ltc2983_chan_assign_common(const struct ltc2983_data *st,
static int __ltc2983_chan_assign_common(struct ltc2983_data *st,
const struct ltc2983_sensor *sensor,
u32 chan_val)
{
u32 reg = LTC2983_CHAN_START_ADDR(sensor->chan);
__be32 __chan_val;
chan_val |= LTC2983_CHAN_TYPE(sensor->type);
dev_dbg(&st->spi->dev, "Assign reg:0x%04X, val:0x%08X\n", reg,
chan_val);
__chan_val = cpu_to_be32(chan_val);
return regmap_bulk_write(st->regmap, reg, &__chan_val,
sizeof(__chan_val));
st->chan_val = cpu_to_be32(chan_val);
return regmap_bulk_write(st->regmap, reg, &st->chan_val,
sizeof(st->chan_val));
}
static int __ltc2983_chan_custom_sensor_assign(struct ltc2983_data *st,