diff options
| author | Peter Rosin <peda@axentia.se> | 2016-05-04 22:15:31 +0200 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2016-05-04 22:39:30 +0200 |
| commit | 1ffcfaf19597ad26797aac3ab42d8ba6e548ef0a (patch) | |
| tree | 8c5f47e211a2b57bc99bc54e1533e32bb39a5cfc /Documentation/i2c | |
| parent | i2c: mux: document i2c muxes and elaborate on parent-/mux-locked muxes (diff) | |
| download | linux-1ffcfaf19597ad26797aac3ab42d8ba6e548ef0a.tar.xz linux-1ffcfaf19597ad26797aac3ab42d8ba6e548ef0a.zip | |
iio: imu: inv_mpu6050: change the i2c gate to be mux-locked
The root i2c adapter lock is then no longer held by the i2c mux during
accesses behind the i2c gate, and such accesses need to take that lock
just like any other ordinary i2c accesses do.
So, declare the i2c gate mux-locked, and zap the code that makes the
unlocked i2c accesses and just use ordinary regmap_write accesses.
This also happens to fix the deadlock described in
http://patchwork.ozlabs.org/patch/584776/ authored by
Adriana Reus <adriana.reus@intel.com> and submitted by
Daniel Baluta <daniel.baluta@intel.com>
----------8<----------
iio: imu: inv_mpu6050: Fix deadlock between i2c adapter lock and mpu lock
This deadlock occurs if the accel/gyro and the sensor on the auxiliary
I2C (in my setup it's an ak8975) are working at the same time.
Scenario:
T1 T2
==== ====
inv_mpu6050_read_fifo aux sensor op (eg. ak8975_read_raw)
| |
mutex_lock(&indio_dev->mlock) i2c_transfer
| |
i2c transaction i2c adapter lock
| |
i2c adapter lock i2c_mux_master_xfer
|
inv_mpu6050_select_bypass
|
mutex_lock(&indio_dev->mlock)
When we operate on an mpu sensor the order of locking is mpu lock
followed by the i2c adapter lock. However, when we operate the auxiliary
sensor the order of locking is the other way around.
...
----------8<----------
The reason this patch fixes the deadlock is that T2 does not grab the
i2c adapter lock until the very end (and grabs the newfangled i2c mux
lock where it previously grabbed the i2c adapter lock).
Acked-by: Jonathan Cameron <jic23@kernel.org>
Acked-by: Daniel Baluta <daniel.baluta@intel.com>
Tested-by: Crestez Dan Leonard <leonard.crestez@intel.com>
Signed-off-by: Peter Rosin <peda@axentia.se>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'Documentation/i2c')
| -rw-r--r-- | Documentation/i2c/i2c-topology | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/Documentation/i2c/i2c-topology b/Documentation/i2c/i2c-topology index 27bfd682808d..69b008518454 100644 --- a/Documentation/i2c/i2c-topology +++ b/Documentation/i2c/i2c-topology @@ -50,7 +50,7 @@ i2c-mux-pinctrl Normally parent-locked, mux-locked iff i2c-mux-reg Parent-locked In drivers/iio/ -imu/inv_mpu6050/ Parent-locked +imu/inv_mpu6050/ Mux-locked In drivers/media/ dvb-frontends/m88ds3103 Parent-locked |