X-Git-Url: https://git.karo-electronics.de/?a=blobdiff_plain;f=fs%2Fdquot.c;h=9af789567e513b4575c9066711b8b6f595c949c7;hb=c161f89be7d57af863e434e9b15afaa863343a7a;hp=0122a279106a9dd4a0475557901471be5c428546;hpb=4d3ce21fa9d2eaeda113aa2f9c2da80d972bef64;p=karo-tx-linux.git

diff --git a/fs/dquot.c b/fs/dquot.c
index 0122a279106a..9af789567e51 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -834,6 +834,9 @@ static void print_warning(struct dquot *dquot, const char warntype)
 	if (!need_print_warning(dquot) || (flag && test_and_set_bit(flag, &dquot->dq_flags)))
 		return;
 
+	mutex_lock(&tty_mutex);
+	if (!current->signal->tty)
+		goto out_lock;
 	tty_write_message(current->signal->tty, dquot->dq_sb->s_id);
 	if (warntype == ISOFTWARN || warntype == BSOFTWARN)
 		tty_write_message(current->signal->tty, ": warning, ");
@@ -861,6 +864,8 @@ static void print_warning(struct dquot *dquot, const char warntype)
 			break;
 	}
 	tty_write_message(current->signal->tty, msg);
+out_lock:
+	mutex_unlock(&tty_mutex);
 }
 
 static inline void flush_warnings(struct dquot **dquots, char *warntype)