X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=drivers%2Ftty%2Fn_tty.c;h=fe9d129c87351b47392320a626dedb89e2f0bf55;hb=e3ac3f2510e5adb62eb4296d3fd0fac5441b2037;hp=41fe8a047d373cf84b14a9a2f5d8f41e07fd3b5f;hpb=e7990d45bb88c2f0565b5ee4c32eefe81653faff;p=karo-tx-linux.git

diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 41fe8a047d37..fe9d129c8735 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -2353,8 +2353,12 @@ static ssize_t n_tty_write(struct tty_struct *tty, struct file *file,
 			if (tty->ops->flush_chars)
 				tty->ops->flush_chars(tty);
 		} else {
+			struct n_tty_data *ldata = tty->disc_data;
+
 			while (nr > 0) {
+				mutex_lock(&ldata->output_lock);
 				c = tty->ops->write(tty, b, nr);
+				mutex_unlock(&ldata->output_lock);
 				if (c < 0) {
 					retval = c;
 					goto break_out;