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tpm, tpm_vtpm_proxy: add kdoc comments for VTPM_PROXY_IOC_NEW_DEV

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Added kdoc comments for VTPM_PROXY_IOC_NEW_DEV so that these can be
imported to the kernel documentation written with rst markup and
generated with Sphinx.

Signed-off-by: Jarkko Sakkinen <[email protected]>
Reviewed-by: Stefan Berger <[email protected]>
This commit is contained in:
Jarkko Sakkinen 2016-11-03 17:57:50 -06:00
commit 7ea7861c8c
2 changed files with 65 additions and 30 deletions
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72
drivers/char/tpm/tpm_vtpm_proxy.c
View file

@ -1,5 +1,6 @@
/*
* Copyright (C) 2015, 2016 IBM Corporation
* Copyright (C) 2016 Intel Corporation
*
* Author: Stefan Berger <stefanb@us.ibm.com>
*
@ -524,6 +525,50 @@ static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev)
* Code related to the control device /dev/vtpmx
*/
/**
* vtpmx_ioc_new_dev - handler for the %VTPM_PROXY_IOC_NEW_DEV ioctl
* @file: /dev/vtpmx
* @ioctl: the ioctl number
* @arg: pointer to the struct vtpmx_proxy_new_dev
*
* Creates an anonymous file that is used by the process acting as a TPM to
* communicate with the client processes. The function will also add a new TPM
* device through which data is proxied to this TPM acting process. The caller
* will be provided with a file descriptor to communicate with the clients and
* major and minor numbers for the TPM device.
*/
static long vtpmx_ioc_new_dev(struct file *file, unsigned int ioctl,
unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct vtpm_proxy_new_dev __user *vtpm_new_dev_p;
struct vtpm_proxy_new_dev vtpm_new_dev;
struct file *vtpm_file;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
vtpm_new_dev_p = argp;
if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p,
sizeof(vtpm_new_dev)))
return -EFAULT;
vtpm_file = vtpm_proxy_create_device(&vtpm_new_dev);
if (IS_ERR(vtpm_file))
return PTR_ERR(vtpm_file);
if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev,
sizeof(vtpm_new_dev))) {
put_unused_fd(vtpm_new_dev.fd);
fput(vtpm_file);
return -EFAULT;
}
fd_install(vtpm_new_dev.fd, vtpm_file);
return 0;
}
/*
* vtpmx_fops_ioctl: ioctl on /dev/vtpmx
*
@ -531,34 +576,11 @@ static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev)
* Returns 0 on success, a negative error code otherwise.
*/
static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl,
unsigned long arg)
unsigned long arg)
{
void __user *argp = (void __user *)arg;
struct vtpm_proxy_new_dev __user *vtpm_new_dev_p;
struct vtpm_proxy_new_dev vtpm_new_dev;
struct file *file;
switch (ioctl) {
case VTPM_PROXY_IOC_NEW_DEV:
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
vtpm_new_dev_p = argp;
if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p,
sizeof(vtpm_new_dev)))
return -EFAULT;
file = vtpm_proxy_create_device(&vtpm_new_dev);
if (IS_ERR(file))
return PTR_ERR(file);
if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev,
sizeof(vtpm_new_dev))) {
put_unused_fd(vtpm_new_dev.fd);
fput(file);
return -EFAULT;
}
fd_install(vtpm_new_dev.fd, file);
return 0;
return vtpmx_ioc_new_dev(f, ioctl, arg);
default:
return -ENOIOCTLCMD;
}