media: drxk_hard: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT)

Locking the root adapter for __i2c_transfer will deadlock if the
device sits behind a mux-locked I2C mux. Switch to the finer-grained
i2c_lock_bus with the I2C_LOCK_SEGMENT flag. If the device does not
sit behind a mux-locked mux, the two locking variants are equivalent.

Signed-off-by: Peter Rosin <peda@axentia.se>
Acked-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/drivers/media/dvb-frontends/drxk_hard.c b/drivers/media/dvb-frontends/drxk_hard.c
index 5a26ad9..29c36f9 100644 (file)
--- a/drivers/media/dvb-frontends/drxk_hard.c
+++ b/drivers/media/dvb-frontends/drxk_hard.c
@@ -213,7 +213,7 @@ static inline u32 log10times100(u32 value)
 
 static int drxk_i2c_lock(struct drxk_state *state)
 {
-       i2c_lock_adapter(state->i2c);
+       i2c_lock_bus(state->i2c, I2C_LOCK_SEGMENT);
        state->drxk_i2c_exclusive_lock = true;
 
        return 0;
@@ -224,7 +224,7 @@ static void drxk_i2c_unlock(struct drxk_state *state)
        if (!state->drxk_i2c_exclusive_lock)
                return;
 
-       i2c_unlock_adapter(state->i2c);
+       i2c_unlock_bus(state->i2c, I2C_LOCK_SEGMENT);
        state->drxk_i2c_exclusive_lock = false;
 }