diff options
| author | Peter Rosin <peda@axentia.se> | 2018-06-20 07:17:54 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-19 22:47:15 +0200 |
| commit | 403c4772b150c14a36f4c5c1cc9c52833926d00b (patch) | |
| tree | a4ac129f8d2fad0a2dfc96351f9106e861c6f018 | |
| parent | cd4ae0b05126cc9461a2e50ccb745e5583cc91e2 (diff) | |
tpm/tpm_i2c_infineon: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT)
[ Upstream commit bb853aac2c478ce78116128263801189408ad2a8 ]
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>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Tested-by: Alexander Steffen <Alexander.Steffen@infineon.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/char/tpm/tpm_i2c_infineon.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c index da69ddea56cf..b15479ac0f90 100644 --- a/drivers/char/tpm/tpm_i2c_infineon.c +++ b/drivers/char/tpm/tpm_i2c_infineon.c @@ -115,7 +115,7 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len) /* Lock the adapter for the duration of the whole sequence. */ if (!tpm_dev.client->adapter->algo->master_xfer) return -EOPNOTSUPP; - i2c_lock_adapter(tpm_dev.client->adapter); + i2c_lock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT); if (tpm_dev.chip_type == SLB9645) { /* use a combined read for newer chips @@ -156,7 +156,7 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len) } out: - i2c_unlock_adapter(tpm_dev.client->adapter); + i2c_unlock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT); /* take care of 'guard time' */ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI); @@ -188,7 +188,7 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len, if (!tpm_dev.client->adapter->algo->master_xfer) return -EOPNOTSUPP; - i2c_lock_adapter(tpm_dev.client->adapter); + i2c_lock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT); /* prepend the 'register address' to the buffer */ tpm_dev.buf[0] = addr; @@ -207,7 +207,7 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, size_t len, usleep_range(sleep_low, sleep_hi); } - i2c_unlock_adapter(tpm_dev.client->adapter); + i2c_unlock_bus(tpm_dev.client->adapter, I2C_LOCK_SEGMENT); /* take care of 'guard time' */ usleep_range(SLEEP_DURATION_LOW, SLEEP_DURATION_HI); |