diff options
| author | Peter Rosin <peda@axentia.se> | 2018-06-20 07:17:56 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-26 08:36:39 +0200 |
| commit | 5cea0d30174384257379f92bc9813f7043bec7e4 (patch) | |
| tree | fa7ee0b8be619da9af438fd5c5da292a34c415c2 | |
| parent | 57da414000905913c77a523013d28f32260c6b6c (diff) | |
input: rohm_bu21023: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT)
[ Upstream commit 193c2a07cfaacb9249ab0e3d34bce32490879355 ]
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: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/input/touchscreen/rohm_bu21023.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/input/touchscreen/rohm_bu21023.c b/drivers/input/touchscreen/rohm_bu21023.c index 611156a2ef80..be29984c0e4c 100644 --- a/drivers/input/touchscreen/rohm_bu21023.c +++ b/drivers/input/touchscreen/rohm_bu21023.c @@ -304,7 +304,7 @@ static int rohm_i2c_burst_read(struct i2c_client *client, u8 start, void *buf, msg[1].len = len; msg[1].buf = buf; - i2c_lock_adapter(adap); + i2c_lock_bus(adap, I2C_LOCK_SEGMENT); for (i = 0; i < 2; i++) { if (__i2c_transfer(adap, &msg[i], 1) < 0) { @@ -313,7 +313,7 @@ static int rohm_i2c_burst_read(struct i2c_client *client, u8 start, void *buf, } } - i2c_unlock_adapter(adap); + i2c_unlock_bus(adap, I2C_LOCK_SEGMENT); return ret; } |