staging:iio:ad2s90: Add comment to device state mutex

Fix the checkpatch.pl issue:
"CHECK: struct mutex definition without comment".

Signed-off-by: Victor Colombo <victorcolombo@gmail.com>
Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Acked-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/staging/iio/resolver/ad2s90.c b/drivers/staging/iio/resolver/ad2s90.c
index 678351dabe6b5fac793eb47f74d2faef14c890a4..a41f5cb10da5094650223fe6e01afd26da95e6a4 100644 (file)
--- a/drivers/staging/iio/resolver/ad2s90.c
+++ b/drivers/staging/iio/resolver/ad2s90.c
@@ -22,7 +22,7 @@
 #define AD2S90_MAX_SPI_FREQ_HZ  830000
 
 struct ad2s90_state {
-       struct mutex lock;
+       struct mutex lock; /* lock to protect rx buffer */
        struct spi_device *sdev;
        u8 rx[2] ____cacheline_aligned;
 };