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Date: Sun, 2 Sep 2018 13:07:20 +0000 From: Sasha Levin <Alexander.Levin@...rosoft.com> To: "stable@...r.kernel.org" <stable@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> CC: Peter Rosin <peda@...ntia.se>, Wolfram Sang <wsa@...-dreams.de>, Sasha Levin <Alexander.Levin@...rosoft.com> Subject: [PATCH AUTOSEL 4.14 58/89] tpm/tpm_i2c_infineon: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT) From: Peter Rosin <peda@...ntia.se> [ 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@...ntia.se> Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com> Tested-by: Alexander Steffen <Alexander.Steffen@...ineon.com> Signed-off-by: Wolfram Sang <wsa@...-dreams.de> Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com> --- drivers/char/tpm/tpm_i2c_infineon.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/char/tpm/tpm_i2c_infineon.c b/drivers/char/tpm/tpm_i2c_infineon.c index d5b44cadac56..c619e76ce827 100644 --- a/drivers/char/tpm/tpm_i2c_infineon.c +++ b/drivers/char/tpm/tpm_i2c_infineon.c @@ -117,7 +117,7 @@ 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 @@ -192,7 +192,7 @@ 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); @@ -224,7 +224,7 @@ 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; @@ -243,7 +243,7 @@ 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); -- 2.17.1
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