From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-eopbgr680125.outbound.protection.outlook.com ([40.107.68.125]:33856 "EHLO NAM04-BN3-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728758AbeIBRaf (ORCPT ); Sun, 2 Sep 2018 13:30:35 -0400 From: Sasha Levin To: "stable@vger.kernel.org" , "linux-kernel@vger.kernel.org" CC: Peter Rosin , Wolfram Sang , Sasha Levin Subject: [PATCH AUTOSEL 4.9 34/62] tpm/tpm_i2c_infineon: switch to i2c_lock_bus(..., I2C_LOCK_SEGMENT) Date: Sun, 2 Sep 2018 13:14:46 +0000 Message-ID: <20180902131411.183978-24-alexander.levin@microsoft.com> References: <20180902131411.183978-1-alexander.levin@microsoft.com> In-Reply-To: <20180902131411.183978-1-alexander.levin@microsoft.com> Content-Language: en-US Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org List-ID: From: Peter Rosin [ 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 Reviewed-by: Jarkko Sakkinen Tested-by: Alexander Steffen Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- 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 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); =20 if (tpm_dev.chip_type =3D=3D SLB9645) { /* use a combined read for newer chips @@ -156,7 +156,7 @@ static int iic_tpm_read(u8 addr, u8 *buffer, size_t len= ) } =20 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); =20 @@ -188,7 +188,7 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, s= ize_t len, =20 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); =20 /* prepend the 'register address' to the buffer */ tpm_dev.buf[0] =3D addr; @@ -207,7 +207,7 @@ static int iic_tpm_write_generic(u8 addr, u8 *buffer, s= ize_t len, usleep_range(sleep_low, sleep_hi); } =20 - 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); =20 --=20 2.17.1