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Subject[PATCH 5/5] rng driver update
# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
# ChangeSet 1.1108 -> 1.1109
# drivers/char/Kconfig 1.10 -> 1.11
# drivers/char/hw_random.c 1.6 -> 1.7
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 03/03/13 jgarzik@redhat.com 1.1109
# [hw_random] fixes and cleanups
#
# * s/Via/VIA/
# * allow multiple simultaneous open(2)s of the chrdev. This allows
# us to eliminate some code, without modifying the core code (rng_dev_read)
# at all.
# * s/__exit// in ->cleanup ops, to eliminate link error
# --------------------------------------------
#
diff -Nru a/drivers/char/Kconfig b/drivers/char/Kconfig
--- a/drivers/char/Kconfig Thu Mar 13 18:53:15 2003
+++ b/drivers/char/Kconfig Thu Mar 13 18:53:15 2003
@@ -710,12 +710,12 @@
If you're not sure, say N.

config HW_RANDOM
- tristate "Intel/AMD/Via H/W Random Number Generator support"
+ tristate "Intel/AMD/VIA HW Random Number Generator support"
depends on (X86 || IA64) && PCI
---help---
This driver provides kernel-side support for the Random Number
Generator hardware found on Intel i8xx-based motherboards,
- and AMD 76x-based motherboards.
+ AMD 76x-based motherboards, and Via Nehemiah CPUs.

Provides a character driver, used to read() entropy data.

diff -Nru a/drivers/char/hw_random.c b/drivers/char/hw_random.c
--- a/drivers/char/hw_random.c Thu Mar 13 18:53:15 2003
+++ b/drivers/char/hw_random.c Thu Mar 13 18:53:15 2003
@@ -1,5 +1,5 @@
/*
- Hardware driver for the Intel/AMD/Via Random Number Generators (RNG)
+ Hardware driver for the Intel/AMD/VIA Random Number Generators (RNG)
(c) Copyright 2003 Red Hat Inc <jgarzik@redhat.com>

derived from
@@ -79,22 +79,21 @@
#define RNG_MISCDEV_MINOR 183 /* official */

static int rng_dev_open (struct inode *inode, struct file *filp);
-static int rng_dev_release (struct inode *inode, struct file *filp);
static ssize_t rng_dev_read (struct file *filp, char *buf, size_t size,
loff_t * offp);

static int __init intel_init (struct pci_dev *dev);
-static void __exit intel_cleanup(void);
+static void intel_cleanup(void);
static unsigned int intel_data_present (void);
static u32 intel_data_read (void);

static int __init amd_init (struct pci_dev *dev);
-static void __exit amd_cleanup(void);
+static void amd_cleanup(void);
static unsigned int amd_data_present (void);
static u32 amd_data_read (void);

static int __init via_init(struct pci_dev *dev);
-static void __exit via_cleanup(void);
+static void via_cleanup(void);
static unsigned int via_data_present (void);
static u32 via_data_read (void);

@@ -107,12 +106,9 @@
};
static struct rng_operations *rng_ops;

-static struct semaphore rng_open_sem; /* Semaphore for serializing rng_open/release */
-
static struct file_operations rng_chrdev_ops = {
.owner = THIS_MODULE,
.open = rng_dev_open,
- .release = rng_dev_release,
.read = rng_dev_read,
};

@@ -262,7 +258,7 @@
return rc;
}

-static void __exit intel_cleanup(void)
+static void intel_cleanup(void)
{
u8 hw_status;

@@ -333,7 +329,7 @@
return rc;
}

-static void __exit amd_cleanup(void)
+static void amd_cleanup(void)
{
u8 rnen;

@@ -346,7 +342,7 @@

/***********************************************************************
*
- * Via RNG operations
+ * VIA RNG operations
*
*/

@@ -448,14 +444,14 @@
unneeded */
rdmsr(MSR_VIA_RNG, lo, hi);
if ((lo & VIA_RNG_ENABLE) == 0) {
- printk(KERN_ERR PFX "cannot enable Via C3 RNG, aborting\n");
+ printk(KERN_ERR PFX "cannot enable VIA C3 RNG, aborting\n");
return -ENODEV;
}

return 0;
}

-static void __exit via_cleanup(void)
+static void via_cleanup(void)
{
u32 lo, hi;

@@ -473,26 +469,12 @@

static int rng_dev_open (struct inode *inode, struct file *filp)
{
+ /* enforce read-only access to this chrdev */
if ((filp->f_mode & FMODE_READ) == 0)
return -EINVAL;
if (filp->f_mode & FMODE_WRITE)
return -EINVAL;

- /* wait for device to become free */
- if (filp->f_flags & O_NONBLOCK) {
- if (down_trylock (&rng_open_sem))
- return -EAGAIN;
- } else {
- if (down_interruptible (&rng_open_sem))
- return -ERESTARTSYS;
- }
- return 0;
-}
-
-
-static int rng_dev_release (struct inode *inode, struct file *filp)
-{
- up(&rng_open_sem);
return 0;
}

@@ -595,8 +577,6 @@

DPRINTK ("ENTER\n");

- init_MUTEX (&rng_open_sem);
-
/* Probe for Intel, AMD RNGs */
pci_for_each_dev(pdev) {
ent = pci_match_device (rng_pci_tbl, pdev);
@@ -607,7 +587,7 @@
}

#ifdef __i386__
- /* Probe for Via RNG */
+ /* Probe for VIA RNG */
if (cpu_has_xstore) {
rng_ops = &rng_vendor_ops[rng_hw_via];
pdev = NULL;
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