diff mbox

[v2,07/10] media: tda1004x: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT)

Message ID 20180620051803.12206-8-peda@axentia.se (mailing list archive)
State New, archived
Headers show

Commit Message

Peter Rosin June 20, 2018, 5:18 a.m. UTC 
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>
---
 drivers/media/dvb-frontends/tda1004x.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)
diff mbox

Patch

diff --git a/drivers/media/dvb-frontends/tda1004x.c b/drivers/media/dvb-frontends/tda1004x.c
index 7dcfb4a4b2d0..9d3261bf5090 100644
--- a/drivers/media/dvb-frontends/tda1004x.c
+++ b/drivers/media/dvb-frontends/tda1004x.c
@@ -329,7 +329,7 @@  static int tda1004x_do_upload(struct tda1004x_state *state,
 	tda1004x_write_byteI(state, dspCodeCounterReg, 0);
 	fw_msg.addr = state->config->demod_address;
 
-	i2c_lock_adapter(state->i2c);
+	i2c_lock_bus(state->i2c, I2C_LOCK_SEGMENT);
 	buf[0] = dspCodeInReg;
 	while (pos != len) {
 		// work out how much to send this time
@@ -342,14 +342,14 @@  static int tda1004x_do_upload(struct tda1004x_state *state,
 		fw_msg.len = tx_size + 1;
 		if (__i2c_transfer(state->i2c, &fw_msg, 1) != 1) {
 			printk(KERN_ERR "tda1004x: Error during firmware upload\n");
-			i2c_unlock_adapter(state->i2c);
+			i2c_unlock_bus(state->i2c, I2C_LOCK_SEGMENT);
 			return -EIO;
 		}
 		pos += tx_size;
 
 		dprintk("%s: fw_pos=0x%x\n", __func__, pos);
 	}
-	i2c_unlock_adapter(state->i2c);
+	i2c_unlock_bus(state->i2c, I2C_LOCK_SEGMENT);
 
 	/* give the DSP a chance to settle 03/10/05 Hac */
 	msleep(100);