From d972b0523fa99358b2a0bafd85fe913b5d4b150a Mon Sep 17 00:00:00 2001 From: Jarkko Sakkinen Date: Sun, 1 Mar 2015 23:55:47 +0200 Subject: [PATCH] tpm: fix call order in tpm-chip.c - tpm_dev_add_device(): cdev_add() must be done before uevent is propagated in order to avoid races. - tpm_chip_register(): tpm_dev_add_device() must be done as the last step before exposing device to the user space in order to avoid races. In addition clarified description in tpm_chip_register(). Fixes: 313d21eeab92 ("tpm: device class for tpm") Fixes: afb5abc262e9 ("tpm: two-phase chip management functions") Signed-off-by: Jarkko Sakkinen Reviewed-by: Peter Huewe Signed-off-by: Peter Huewe --- drivers/char/tpm/tpm-chip.c | 44 ++++++++++++++++--------------------- 1 file changed, 19 insertions(+), 25 deletions(-) diff --git a/drivers/char/tpm/tpm-chip.c b/drivers/char/tpm/tpm-chip.c index 1d278ccd751f..e096e9cddb40 100644 --- a/drivers/char/tpm/tpm-chip.c +++ b/drivers/char/tpm/tpm-chip.c @@ -140,16 +140,6 @@ static int tpm_dev_add_device(struct tpm_chip *chip) { int rc; - rc = device_add(&chip->dev); - if (rc) { - dev_err(&chip->dev, - "unable to device_register() %s, major %d, minor %d, err=%d\n", - chip->devname, MAJOR(chip->dev.devt), - MINOR(chip->dev.devt), rc); - - return rc; - } - rc = cdev_add(&chip->cdev, chip->dev.devt, 1); if (rc) { dev_err(&chip->dev, @@ -161,6 +151,16 @@ static int tpm_dev_add_device(struct tpm_chip *chip) return rc; } + rc = device_add(&chip->dev); + if (rc) { + dev_err(&chip->dev, + "unable to device_register() %s, major %d, minor %d, err=%d\n", + chip->devname, MAJOR(chip->dev.devt), + MINOR(chip->dev.devt), rc); + + return rc; + } + return rc; } @@ -174,27 +174,17 @@ static void tpm_dev_del_device(struct tpm_chip *chip) * tpm_chip_register() - create a character device for the TPM chip * @chip: TPM chip to use. * - * Creates a character device for the TPM chip and adds sysfs interfaces for - * the device, PPI and TCPA. As the last step this function adds the - * chip to the list of TPM chips available for use. + * Creates a character device for the TPM chip and adds sysfs attributes for + * the device. As the last step this function adds the chip to the list of TPM + * chips available for in-kernel use. * - * NOTE: This function should be only called after the chip initialization - * is complete. - * - * Called from tpm_.c probe function only for devices - * the driver has determined it should claim. Prior to calling - * this function the specific probe function has called pci_enable_device - * upon errant exit from this function specific probe function should call - * pci_disable_device + * This function should be only called after the chip initialization is + * complete. */ int tpm_chip_register(struct tpm_chip *chip) { int rc; - rc = tpm_dev_add_device(chip); - if (rc) - return rc; - /* Populate sysfs for TPM1 devices. */ if (!(chip->flags & TPM_CHIP_FLAG_TPM2)) { rc = tpm_sysfs_add_device(chip); @@ -208,6 +198,10 @@ int tpm_chip_register(struct tpm_chip *chip) chip->bios_dir = tpm_bios_log_setup(chip->devname); } + rc = tpm_dev_add_device(chip); + if (rc) + return rc; + /* Make the chip available. */ spin_lock(&driver_lock); list_add_rcu(&chip->list, &tpm_chip_list);