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Subject[PATCH] video/via: Convert to kstrtou8_from_user
Date
This patch replaces the code for getting an number from a
userspace buffer by a simple call to kstrou8_from_user.
This makes it easier to read and less error prone.

Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
---
drivers/video/via/viafbdev.c | 26 ++++++++++----------------
1 files changed, 10 insertions(+), 16 deletions(-)
diff --git a/drivers/video/via/viafbdev.c b/drivers/video/via/viafbdev.c
index 0c88375..5b0d524 100644
--- a/drivers/video/via/viafbdev.c
+++ b/drivers/video/via/viafbdev.c
@@ -1276,17 +1276,14 @@ static int viafb_dfph_proc_open(struct inode *inode, struct file *file)
static ssize_t viafb_dfph_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *pos)
{
- char buf[20];
+ int err;
u8 reg_val = 0;
- unsigned long length;
if (count < 1)
return -EINVAL;
- length = count > 20 ? 20 : count;
- if (copy_from_user(&buf[0], buffer, length))
- return -EFAULT;
- buf[length - 1] = '\0'; /*Ensure end string */
- if (kstrtou8(buf, 0, &reg_val) < 0)
- return -EINVAL;
+ err = kstrtou8_from_user(buffer, count, 0, &reg_val);
+ if (err)
+ return err;
+
viafb_write_reg_mask(CR97, VIACR, reg_val, 0x0f);
return count;
}
@@ -1316,17 +1313,14 @@ static int viafb_dfpl_proc_open(struct inode *inode, struct file *file)
static ssize_t viafb_dfpl_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *pos)
{
- char buf[20];
+ int err;
u8 reg_val = 0;
- unsigned long length;
if (count < 1)
return -EINVAL;
- length = count > 20 ? 20 : count;
- if (copy_from_user(&buf[0], buffer, length))
- return -EFAULT;
- buf[length - 1] = '\0'; /*Ensure end string */
- if (kstrtou8(buf, 0, &reg_val) < 0)
- return -EINVAL;
+ err = kstrtou8_from_user(buffer, count, 0, &reg_val);
+ if (err)
+ return err;
+
viafb_write_reg_mask(CR99, VIACR, reg_val, 0x0f);
return count;
}
--
1.7.3.4


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