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Update for the srm_env driver.
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This patch contains a fix for a bug introduced more than a year ago
(not setting *eof) and updates whitespace a bit.

Signed-off-by: Jan-Benedict Glaw <[email protected]>
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@jbglaw
jbglaw committed Nov 7, 2006
1 parent edd106f commit 16b7f4d
Showing 1 changed file with 27 additions and 57 deletions.
84 changes: 27 additions & 57 deletions arch/alpha/kernel/srm_env.c
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@
* srm_env.c - Access to SRM environment
* variables through linux' procfs
*
* Copyright (C) 2001-2002 Jan-Benedict Glaw <[email protected]>
* (C) 2001,2002,2006 by Jan-Benedict Glaw <[email protected]>
*
* This driver is at all a modified version of Erik Mouw's
* Documentation/DocBook/procfs_example.c, so: thank
Expand All @@ -21,41 +21,14 @@
* warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more
* details.
*
*
* You should have received a copy of the GNU General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place,
* Suite 330, Boston, MA 02111-1307 USA
*
*/

/*
* Changelog
* ~~~~~~~~~
*
* Thu, 22 Aug 2002 15:10:43 +0200
* - Update Config.help entry. I got a number of emails asking
* me to tell their senders if they could make use of this
* piece of code... So: "SRM is something like BIOS for your
* Alpha"
* - Update code formatting a bit to better conform CodingStyle
* rules.
* - So this is v0.0.5, with no changes (except formatting)
*
* Wed, 22 May 2002 00:11:21 +0200
* - Fix typo on comment (SRC -> SRM)
* - Call this "Version 0.0.4"
*
* Tue, 9 Apr 2002 18:44:40 +0200
* - Implement access by variable name and additionally
* by number. This is done by creating two subdirectories
* where one holds all names (like the old directory
* did) and the other holding 256 files named like "0",
* "1" and so on.
* - Call this "Version 0.0.3"
*
*/

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
Expand All @@ -67,7 +40,7 @@
#define BASE_DIR "srm_environment" /* Subdir in /proc/ */
#define NAMED_DIR "named_variables" /* Subdir for known variables */
#define NUMBERED_DIR "numbered_variables" /* Subdir for all variables */
#define VERSION "0.0.5" /* Module version */
#define VERSION "0.0.6" /* Module version */
#define NAME "srm_env" /* Module name */

MODULE_AUTHOR("Jan-Benedict Glaw <[email protected]>");
Expand Down Expand Up @@ -106,7 +79,6 @@ static srm_env_t srm_named_entries[] = {
static srm_env_t srm_numbered_entries[256];



static int
srm_env_read(char *page, char **start, off_t off, int count, int *eof,
void *data)
Expand All @@ -115,21 +87,23 @@ srm_env_read(char *page, char **start, off_t off, int count, int *eof,
unsigned long ret;
srm_env_t *entry;

if(off != 0)
return -EFAULT;
if (off != 0) {
*eof = 1;
return 0;
}

entry = (srm_env_t *) data;
ret = callback_getenv(entry->id, page, count);

if((ret >> 61) == 0)
if ((ret >> 61) == 0) {
nbytes = (int) ret;
else
*eof = 1;
} else
nbytes = -EFAULT;

return nbytes;
}


static int
srm_env_write(struct file *file, const char __user *buffer, unsigned long count,
void *data)
Expand All @@ -155,7 +129,7 @@ srm_env_write(struct file *file, const char __user *buffer, unsigned long count,

ret1 = callback_setenv(entry->id, buf, count);
if ((ret1 >> 61) == 0) {
do
do
ret2 = callback_save_env();
while((ret2 >> 61) == 1);
res = (int) ret1;
Expand All @@ -172,14 +146,14 @@ srm_env_cleanup(void)
srm_env_t *entry;
unsigned long var_num;

if(base_dir) {
if (base_dir) {
/*
* Remove named entries
*/
if(named_dir) {
if (named_dir) {
entry = srm_named_entries;
while(entry->name != NULL && entry->id != 0) {
if(entry->proc_entry) {
while (entry->name != NULL && entry->id != 0) {
if (entry->proc_entry) {
remove_proc_entry(entry->name,
named_dir);
entry->proc_entry = NULL;
Expand All @@ -192,11 +166,11 @@ srm_env_cleanup(void)
/*
* Remove numbered entries
*/
if(numbered_dir) {
for(var_num = 0; var_num <= 255; var_num++) {
if (numbered_dir) {
for (var_num = 0; var_num <= 255; var_num++) {
entry = &srm_numbered_entries[var_num];

if(entry->proc_entry) {
if (entry->proc_entry) {
remove_proc_entry(entry->name,
numbered_dir);
entry->proc_entry = NULL;
Expand All @@ -212,7 +186,6 @@ srm_env_cleanup(void)
return;
}


static int __init
srm_env_init(void)
{
Expand All @@ -222,7 +195,7 @@ srm_env_init(void)
/*
* Check system
*/
if(!alpha_using_srm) {
if (!alpha_using_srm) {
printk(KERN_INFO "%s: This Alpha system doesn't "
"know about SRM (or you've booted "
"SRM->MILO->Linux, which gets "
Expand All @@ -233,14 +206,14 @@ srm_env_init(void)
/*
* Init numbers
*/
for(var_num = 0; var_num <= 255; var_num++)
for (var_num = 0; var_num <= 255; var_num++)
sprintf(number[var_num], "%ld", var_num);

/*
* Create base directory
*/
base_dir = proc_mkdir(BASE_DIR, NULL);
if(base_dir == NULL) {
if (!base_dir) {
printk(KERN_ERR "Couldn't create base dir /proc/%s\n",
BASE_DIR);
goto cleanup;
Expand All @@ -251,7 +224,7 @@ srm_env_init(void)
* Create per-name subdirectory
*/
named_dir = proc_mkdir(NAMED_DIR, base_dir);
if(named_dir == NULL) {
if (!named_dir) {
printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
BASE_DIR, NAMED_DIR);
goto cleanup;
Expand All @@ -262,7 +235,7 @@ srm_env_init(void)
* Create per-number subdirectory
*/
numbered_dir = proc_mkdir(NUMBERED_DIR, base_dir);
if(numbered_dir == NULL) {
if (!numbered_dir) {
printk(KERN_ERR "Couldn't create dir /proc/%s/%s\n",
BASE_DIR, NUMBERED_DIR);
goto cleanup;
Expand All @@ -274,10 +247,10 @@ srm_env_init(void)
* Create all named nodes
*/
entry = srm_named_entries;
while(entry->name != NULL && entry->id != 0) {
while (entry->name && entry->id) {
entry->proc_entry = create_proc_entry(entry->name,
0644, named_dir);
if(entry->proc_entry == NULL)
if (!entry->proc_entry)
goto cleanup;

entry->proc_entry->data = (void *) entry;
Expand All @@ -291,13 +264,13 @@ srm_env_init(void)
/*
* Create all numbered nodes
*/
for(var_num = 0; var_num <= 255; var_num++) {
for (var_num = 0; var_num <= 255; var_num++) {
entry = &srm_numbered_entries[var_num];
entry->name = number[var_num];

entry->proc_entry = create_proc_entry(entry->name,
0644, numbered_dir);
if(entry->proc_entry == NULL)
if (!entry->proc_entry)
goto cleanup;

entry->id = var_num;
Expand All @@ -318,7 +291,6 @@ srm_env_init(void)
return -ENOMEM;
}


static void __exit
srm_env_exit(void)
{
Expand All @@ -328,7 +300,5 @@ srm_env_exit(void)
return;
}


module_init(srm_env_init);
module_exit(srm_env_exit);

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