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PM: Fix PM QOS's user mode interface to work with ASCII input

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Make pm_qos_power_write() accept values passed to it in the ASCII hex
format either with or without an ending newline.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Mark Gross <markgross@thegnar.org>
This commit is contained in:
Rafael J. Wysocki 2011-05-27 00:05:23 +02:00
parent f42a9813fb
commit 0775a60aca
1 changed files with 23 additions and 10 deletions
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33
kernel/pm_qos_params.c
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@ -40,6 +40,7 @@
#include <linux/string.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/uaccess.h>
@ -404,24 +405,36 @@ static ssize_t pm_qos_power_write(struct file *filp, const char __user *buf,
size_t count, loff_t *f_pos)
{
s32 value;
int x;
char ascii_value[11];
struct pm_qos_request_list *pm_qos_req;
if (count == sizeof(s32)) {
if (copy_from_user(&value, buf, sizeof(s32)))
return -EFAULT;
} else if (count == 11) { /* len('0x12345678/0') */
if (copy_from_user(ascii_value, buf, 11))
} else if (count <= 11) { /* ASCII perhaps? */
char ascii_value[11];
unsigned long int ulval;
int ret;
if (copy_from_user(ascii_value, buf, count))
return -EFAULT;
if (strlen(ascii_value) != 10)
if (count > 10) {
if (ascii_value[10] == '\n')
ascii_value[10] = '\0';
else
return -EINVAL;
} else {
ascii_value[count] = '\0';
}
ret = strict_strtoul(ascii_value, 16, &ulval);
if (ret) {
pr_debug("%s, 0x%lx, 0x%x\n", ascii_value, ulval, ret);
return -EINVAL;
x = sscanf(ascii_value, "%x", &value);
if (x != 1)
return -EINVAL;
pr_debug("%s, %d, 0x%x\n", ascii_value, x, value);
} else
}
value = (s32)lower_32_bits(ulval);
} else {
return -EINVAL;
}
pm_qos_req = filp->private_data;
pm_qos_update_request(pm_qos_req, value);