led_proc_write() looks at the first eight bytes of a write and returns
that many, so a writer that loops until everything is written, stdio
does, sends the rest as a second command. That one is unknown and
switches the LED off. Return the whole count, the rest is ignored.
Fixes: ee1858d3122d ("[SPARC]: Add sun4m LED driver.")
Signed-off-by: Christian Brauner (Amutable) <[email protected]>
---
arch/sparc/kernel/led.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/sparc/kernel/led.c b/arch/sparc/kernel/led.c
index 9b53ac1fe533..a1478de9fe5d 100644
--- a/arch/sparc/kernel/led.c
+++ b/arch/sparc/kernel/led.c
@@ -68,6 +68,7 @@ static int led_proc_open(struct inode *inode, struct file
*file)
static ssize_t led_proc_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
{
+ size_t len = count;
char *buf = NULL;
if (count > LED_MAX_LENGTH)
@@ -102,7 +103,7 @@ static ssize_t led_proc_write(struct file *file, const char
__user *buffer,
kfree(buf);
- return count;
+ return len;
}
static const struct proc_ops led_proc_ops = {
--
2.53.0
