diff options
author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-10-15 23:16:07 +0100 |
---|---|---|
committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-10-15 23:16:07 +0100 |
commit | 2502991560dc8244dbe10e48473d85722c1e2ec1 (patch) | |
tree | 63b1f3be2ed56ff06f1e8db709e4ce85d69c3add /drivers/char/tpm | |
parent | 7e69a8c4d06b7ecb874f571e82b715a9f79bc3c4 (diff) | |
parent | a9ff8f6462635c8d9f8d64b7b10ddcea8404d77b (diff) |
Merge branch 'fixes' into for-linus
Conflicts:
arch/arm/mach-versatile/core.c
Diffstat (limited to 'drivers/char/tpm')
-rw-r--r-- | drivers/char/tpm/Kconfig | 1 | ||||
-rw-r--r-- | drivers/char/tpm/tpm.c | 96 | ||||
-rw-r--r-- | drivers/char/tpm/tpm.h | 3 | ||||
-rw-r--r-- | drivers/char/tpm/tpm_tis.c | 14 |
4 files changed, 62 insertions, 52 deletions
diff --git a/drivers/char/tpm/Kconfig b/drivers/char/tpm/Kconfig index 3738cfa209f..f5fc64f89c5 100644 --- a/drivers/char/tpm/Kconfig +++ b/drivers/char/tpm/Kconfig @@ -6,6 +6,7 @@ menuconfig TCG_TPM tristate "TPM Hardware Support" depends on HAS_IOMEM depends on EXPERIMENTAL + select SECURITYFS ---help--- If you have a TPM security chip in your system, which implements the Trusted Computing Group's specification, diff --git a/drivers/char/tpm/tpm.c b/drivers/char/tpm/tpm.c index ae766d86845..1fee7034a38 100644 --- a/drivers/char/tpm/tpm.c +++ b/drivers/char/tpm/tpm.c @@ -954,72 +954,63 @@ EXPORT_SYMBOL_GPL(tpm_store_cancel); /* * Device file system interface to the TPM + * + * It's assured that the chip will be opened just once, + * by the check of is_open variable, which is protected + * by driver_lock. */ int tpm_open(struct inode *inode, struct file *file) { - int rc = 0, minor = iminor(inode); + int minor = iminor(inode); struct tpm_chip *chip = NULL, *pos; - lock_kernel(); - spin_lock(&driver_lock); - - list_for_each_entry(pos, &tpm_chip_list, list) { + rcu_read_lock(); + list_for_each_entry_rcu(pos, &tpm_chip_list, list) { if (pos->vendor.miscdev.minor == minor) { chip = pos; + get_device(chip->dev); break; } } + rcu_read_unlock(); - if (chip == NULL) { - rc = -ENODEV; - goto err_out; - } + if (!chip) + return -ENODEV; - if (chip->num_opens) { + if (test_and_set_bit(0, &chip->is_open)) { dev_dbg(chip->dev, "Another process owns this TPM\n"); - rc = -EBUSY; - goto err_out; + put_device(chip->dev); + return -EBUSY; } - chip->num_opens++; - get_device(chip->dev); - - spin_unlock(&driver_lock); - chip->data_buffer = kmalloc(TPM_BUFSIZE * sizeof(u8), GFP_KERNEL); if (chip->data_buffer == NULL) { - chip->num_opens--; + clear_bit(0, &chip->is_open); put_device(chip->dev); - unlock_kernel(); return -ENOMEM; } atomic_set(&chip->data_pending, 0); file->private_data = chip; - unlock_kernel(); return 0; - -err_out: - spin_unlock(&driver_lock); - unlock_kernel(); - return rc; } EXPORT_SYMBOL_GPL(tpm_open); +/* + * Called on file close + */ int tpm_release(struct inode *inode, struct file *file) { struct tpm_chip *chip = file->private_data; + del_singleshot_timer_sync(&chip->user_read_timer); flush_scheduled_work(); - spin_lock(&driver_lock); file->private_data = NULL; - del_singleshot_timer_sync(&chip->user_read_timer); atomic_set(&chip->data_pending, 0); - chip->num_opens--; - put_device(chip->dev); kfree(chip->data_buffer); - spin_unlock(&driver_lock); + clear_bit(0, &chip->is_open); + put_device(chip->dev); return 0; } EXPORT_SYMBOL_GPL(tpm_release); @@ -1093,13 +1084,11 @@ void tpm_remove_hardware(struct device *dev) } spin_lock(&driver_lock); - - list_del(&chip->list); - + list_del_rcu(&chip->list); spin_unlock(&driver_lock); + synchronize_rcu(); misc_deregister(&chip->vendor.miscdev); - sysfs_remove_group(&dev->kobj, chip->vendor.attr_group); tpm_bios_log_teardown(chip->bios_dir); @@ -1144,25 +1133,33 @@ int tpm_pm_resume(struct device *dev) } EXPORT_SYMBOL_GPL(tpm_pm_resume); +/* In case vendor provided release function, call it too.*/ + +void tpm_dev_vendor_release(struct tpm_chip *chip) +{ + if (chip->vendor.release) + chip->vendor.release(chip->dev); + + clear_bit(chip->dev_num, dev_mask); + kfree(chip->vendor.miscdev.name); +} +EXPORT_SYMBOL_GPL(tpm_dev_vendor_release); + + /* * Once all references to platform device are down to 0, * release all allocated structures. - * In case vendor provided release function, - * call it too. */ static void tpm_dev_release(struct device *dev) { struct tpm_chip *chip = dev_get_drvdata(dev); - if (chip->vendor.release) - chip->vendor.release(dev); + tpm_dev_vendor_release(chip); chip->release(dev); - - clear_bit(chip->dev_num, dev_mask); - kfree(chip->vendor.miscdev.name); kfree(chip); } +EXPORT_SYMBOL_GPL(tpm_dev_release); /* * Called from tpm_<specific>.c probe function only for devices @@ -1171,8 +1168,8 @@ static void tpm_dev_release(struct device *dev) * upon errant exit from this function specific probe function should call * pci_disable_device */ -struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vendor_specific - *entry) +struct tpm_chip *tpm_register_hardware(struct device *dev, + const struct tpm_vendor_specific *entry) { #define DEVNAME_SIZE 7 @@ -1231,21 +1228,20 @@ struct tpm_chip *tpm_register_hardware(struct device *dev, const struct tpm_vend return NULL; } - spin_lock(&driver_lock); - - list_add(&chip->list, &tpm_chip_list); - - spin_unlock(&driver_lock); - if (sysfs_create_group(&dev->kobj, chip->vendor.attr_group)) { - list_del(&chip->list); misc_deregister(&chip->vendor.miscdev); put_device(chip->dev); + return NULL; } chip->bios_dir = tpm_bios_log_setup(devname); + /* Make chip available */ + spin_lock(&driver_lock); + list_add_rcu(&chip->list, &tpm_chip_list); + spin_unlock(&driver_lock); + return chip; } EXPORT_SYMBOL_GPL(tpm_register_hardware); diff --git a/drivers/char/tpm/tpm.h b/drivers/char/tpm/tpm.h index e885148b4cf..8e30df4a438 100644 --- a/drivers/char/tpm/tpm.h +++ b/drivers/char/tpm/tpm.h @@ -90,7 +90,7 @@ struct tpm_chip { struct device *dev; /* Device stuff */ int dev_num; /* /dev/tpm# */ - int num_opens; /* only one allowed */ + unsigned long is_open; /* only one allowed */ int time_expired; /* Data passed to and from the tpm via the read/write calls */ @@ -132,6 +132,7 @@ extern struct tpm_chip* tpm_register_hardware(struct device *, const struct tpm_vendor_specific *); extern int tpm_open(struct inode *, struct file *); extern int tpm_release(struct inode *, struct file *); +extern void tpm_dev_vendor_release(struct tpm_chip *); extern ssize_t tpm_write(struct file *, const char __user *, size_t, loff_t *); extern ssize_t tpm_read(struct file *, char __user *, size_t, loff_t *); diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index ed1879c0dd8..717af7ad1bd 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -630,12 +630,23 @@ static struct pnp_device_id tpm_pnp_tbl[] __devinitdata = { {"", 0} /* Terminator */ }; +static __devexit void tpm_tis_pnp_remove(struct pnp_dev *dev) +{ + struct tpm_chip *chip = pnp_get_drvdata(dev); + + tpm_dev_vendor_release(chip); + + kfree(chip); +} + + static struct pnp_driver tis_pnp_driver = { .name = "tpm_tis", .id_table = tpm_pnp_tbl, .probe = tpm_tis_pnp_init, .suspend = tpm_tis_pnp_suspend, .resume = tpm_tis_pnp_resume, + .remove = tpm_tis_pnp_remove, }; #define TIS_HID_USR_IDX sizeof(tpm_pnp_tbl)/sizeof(struct pnp_device_id) -2 @@ -683,6 +694,7 @@ static void __exit cleanup_tis(void) spin_lock(&tis_lock); list_for_each_entry_safe(i, j, &tis_chips, list) { chip = to_tpm_chip(i); + tpm_remove_hardware(chip->dev); iowrite32(~TPM_GLOBAL_INT_ENABLE & ioread32(chip->vendor.iobase + TPM_INT_ENABLE(chip->vendor. @@ -694,9 +706,9 @@ static void __exit cleanup_tis(void) free_irq(chip->vendor.irq, chip); iounmap(i->iobase); list_del(&i->list); - tpm_remove_hardware(chip->dev); } spin_unlock(&tis_lock); + if (force) { platform_device_unregister(pdev); driver_unregister(&tis_drv); |