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authorGuillaume Chazarain <guichaz@yahoo.fr>2006-01-08 01:02:43 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-08 20:13:53 -0800
commitcd140a5c1f456f50897af4a2e9a23d228a5fe719 (patch)
tree24170cf30ce2c5d3129c9b535942c4c52231a042
parent025510cd20f4c35c3958bea133d96c9bd7c6ef9e (diff)
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[PATCH] kmsg_write: don't return printk return value
kmsg_write returns with printk, so some programs may be confused by a successful write() with a return value different than the buffer length. # /bin/echo something > /dev/kmsg /bin/echo: write error: Inappropriate ioctl for device The drawbacks is that the printk return value can no more be quickly checked from userspace. Signed-off-by: Guillaume Chazarain <guichaz@yahoo.fr> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--drivers/char/mem.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 91dd669..a85f3a3 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -817,7 +817,7 @@ static ssize_t kmsg_write(struct file * file, const char __user * buf,
size_t count, loff_t *ppos)
{
char *tmp;
- int ret;
+ ssize_t ret;
tmp = kmalloc(count + 1, GFP_KERNEL);
if (tmp == NULL)
@@ -826,6 +826,9 @@ static ssize_t kmsg_write(struct file * file, const char __user * buf,
if (!copy_from_user(tmp, buf, count)) {
tmp[count] = 0;
ret = printk("%s", tmp);
+ if (ret > count)
+ /* printk can add a prefix */
+ ret = count;
}
kfree(tmp);
return ret;