pinctrl: Relax user input size in pinmux_select()

This is debugfs and there is no much sense to strict the user from
sending as much data as they can. The memdup_user_nul() will anyway
fail if there is not enough memory.

Relax the user input size by removing an artificial limitaion.

Signed-off-by: Andy Shevchenko <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>

Author: andy-shev

drivers/pinctrl/pinmux.c

@@ -677,7 +677,6 @@ void pinmux_show_setting(struct seq_file *s,
 DEFINE_SHOW_ATTRIBUTE(pinmux_functions);
 DEFINE_SHOW_ATTRIBUTE(pinmux_pins);
 
-#define PINMUX_SELECT_MAX 128
 static ssize_t pinmux_select(struct file *file, const char __user *user_buf,
 				   size_t len, loff_t *ppos)
 {
@@ -689,9 +688,6 @@ static ssize_t pinmux_select(struct file *file, const char __user *user_buf,
 	unsigned int num_groups;
 	int fsel, gsel, ret;
 
-	if (len > PINMUX_SELECT_MAX)
-		return -ENOMEM;
-
 	buf = memdup_user_nul(user_buf, len);
 	if (IS_ERR(buf))
 		return PTR_ERR(buf);