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authorJiri Slaby <jslaby@suse.cz>2018-09-07 16:19:06 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-09-18 17:07:25 +0300
commitfeacbecb39db098cd9f6d728dcb00d753a3f36ed (patch)
tree843e7d9e2a9ee69accaf38ea8fb68d3418efbb40 /drivers/tty/tty_buffer.c
parent863299001b39280b3be9f5c627d23debe66aa71b (diff)
downloadlinux-feacbecb39db098cd9f6d728dcb00d753a3f36ed.tar.xz
TTY: tty_buffer, warn on leaks
When we leak some tty buffer, warn about that. For that we need to account the memory used also in the tty_buffer_free_all function. On other locations, the accounting is handled correctly. Note that we do not account the free list, as that was accounted in tty_buffer_free before put on the free list. I have been using this patch for ages, so let's see if anybody else encounters any issues. Signed-off-by: Jiri Slaby <jslaby@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_buffer.c')
-rw-r--r--drivers/tty/tty_buffer.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/tty/tty_buffer.c b/drivers/tty/tty_buffer.c
index c996b6859c5e..76151c002858 100644
--- a/drivers/tty/tty_buffer.c
+++ b/drivers/tty/tty_buffer.c
@@ -118,9 +118,12 @@ void tty_buffer_free_all(struct tty_port *port)
struct tty_bufhead *buf = &port->buf;
struct tty_buffer *p, *next;
struct llist_node *llist;
+ unsigned int freed = 0;
+ int still_used;
while ((p = buf->head) != NULL) {
buf->head = p->next;
+ freed += p->size;
if (p->size > 0)
kfree(p);
}
@@ -132,7 +135,9 @@ void tty_buffer_free_all(struct tty_port *port)
buf->head = &buf->sentinel;
buf->tail = &buf->sentinel;
- atomic_set(&buf->mem_used, 0);
+ still_used = atomic_xchg(&buf->mem_used, 0);
+ WARN(still_used != freed, "we still have not freed %d bytes!",
+ still_used - freed);
}
/**