From: Jonathan Cameron Jonathan.Cameron@huawei.com
stable inclusion from stable-5.10.50 commit 3cca4db5f73310d03c4b31c4d6f820452ce9f2a0 bugzilla: 174522 https://gitee.com/openeuler/kernel/issues/I4DNFY
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
--------------------------------
[ Upstream commit fc36da3131a747a9367a05caf06de19be1bcc972 ]
To make code more readable, use a structure to express the channel layout and ensure the timestamp is 8 byte aligned.
Found during an audit of all calls of this function.
Fixes: b9a6a237ffc9 ("iio:bma180: Drop _update_scan_mode()") Signed-off-by: Jonathan Cameron Jonathan.Cameron@huawei.com Cc: Peter Meerwald pmeerw@pmeerw.net Reviewed-by: Andy Shevchenko andy.shevchenko@gmail.com Link: https://lore.kernel.org/r/20210501170121.512209-2-jic23@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Chen Jun chenjun102@huawei.com Acked-by: Weilong Chen chenweilong@huawei.com Signed-off-by: Chen Jun chenjun102@huawei.com --- drivers/iio/accel/bma180.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/accel/bma180.c b/drivers/iio/accel/bma180.c index 2309bdd00a31..da56488182d0 100644 --- a/drivers/iio/accel/bma180.c +++ b/drivers/iio/accel/bma180.c @@ -164,7 +164,11 @@ struct bma180_data { int scale; int bw; bool pmode; - u8 buff[16]; /* 3x 16-bit + 8-bit + padding + timestamp */ + /* Ensure timestamp is naturally aligned */ + struct { + s16 chan[4]; + s64 timestamp __aligned(8); + } scan; };
enum bma180_chan { @@ -943,12 +947,12 @@ static irqreturn_t bma180_trigger_handler(int irq, void *p) mutex_unlock(&data->mutex); goto err; } - ((s16 *)data->buff)[i++] = ret; + data->scan.chan[i++] = ret; }
mutex_unlock(&data->mutex);
- iio_push_to_buffers_with_timestamp(indio_dev, data->buff, time_ns); + iio_push_to_buffers_with_timestamp(indio_dev, &data->scan, time_ns); err: iio_trigger_notify_done(indio_dev->trig);