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vt6655: slightly clean reading config file 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2013-04-06 18:11:22 -04:00
parent 7c51d177f0
commit f805442e13
1 changed files with 40 additions and 75 deletions
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89
drivers/staging/vt6655/device_main.c
View File

@ -60,6 +60,7 @@
*/
#undef __NO_VERSION__
#include <linux/file.h>
#include "device.h"
#include "card.h"
#include "channel.h"
@ -2946,86 +2947,50 @@ static int Config_FileGetParameter(unsigned char *string,
return true;
}
int Config_FileOperation(PSDevice pDevice,bool fwrite,unsigned char *Parameter) {
unsigned char *config_path = CONFIG_PATH;
unsigned char *buffer = NULL;
int Config_FileOperation(PSDevice pDevice,bool fwrite,unsigned char *Parameter)
{
unsigned char *buffer = kmalloc(1024, GFP_KERNEL);
unsigned char tmpbuffer[20];
struct file *filp=NULL;
mm_segment_t old_fs = get_fs();
//int oldfsuid=0,oldfsgid=0;
struct file *file;
int result=0;
set_fs (KERNEL_DS);
/* Can't do this anymore, so we rely on correct filesystem permissions:
//Make sure a caller can read or write power as root
oldfsuid=current->cred->fsuid;
oldfsgid=current->cred->fsgid;
current->cred->fsuid = 0;
current->cred->fsgid = 0;
*/
//open file
filp = filp_open(config_path, O_RDWR, 0);
if (IS_ERR(filp)) {
printk("Config_FileOperation:open file fail?\n");
result=-1;
goto error2;
}
if(!(filp->f_op) || !(filp->f_op->read) ||!(filp->f_op->write)) {
printk("file %s cann't readable or writable?\n",config_path);
result = -1;
goto error1;
}
buffer = kmalloc(1024, GFP_KERNEL);
if(buffer==NULL) {
if (!buffer) {
printk("allocate mem for file fail?\n");
result = -1;
goto error1;
}
return -1;
}
file = filp_open(CONFIG_PATH, O_RDONLY, 0);
if (IS_ERR(file)) {
kfree(buffer);
printk("Config_FileOperation:open file fail?\n");
return -1;
}
if(filp->f_op->read(filp, buffer, 1024, &filp->f_pos)<0) {
if (kernel_read(file, 0, buffer, 1024) < 0) {
printk("read file error?\n");
result = -1;
goto error1;
}
}
if(Config_FileGetParameter("ZONETYPE",tmpbuffer,buffer)!=true) {
if (Config_FileGetParameter("ZONETYPE",tmpbuffer,buffer)!=true) {
printk("get parameter error?\n");
result = -1;
goto error1;
}
}
if(memcmp(tmpbuffer,"USA",3)==0) {
result=ZoneType_USA;
}
else if(memcmp(tmpbuffer,"JAPAN",5)==0) {
result=ZoneType_Japan;
}
else if(memcmp(tmpbuffer,"EUROPE",5)==0) {
result=ZoneType_Europe;
}
else {
if (memcmp(tmpbuffer,"USA",3)==0) {
result = ZoneType_USA;
} else if(memcmp(tmpbuffer,"JAPAN",5)==0) {
result = ZoneType_Japan;
} else if(memcmp(tmpbuffer,"EUROPE",5)==0) {
result = ZoneType_Europe;
} else {
result = -1;
printk("Unknown Zonetype[%s]?\n",tmpbuffer);
}
}
error1:
kfree(buffer);
if(filp_close(filp,NULL))
printk("Config_FileOperation:close file fail\n");
error2:
set_fs (old_fs);
/*
current->cred->fsuid=oldfsuid;
current->cred->fsgid=oldfsgid;
*/
fput(file);
return result;
}