diff options
| author | John Ogness <[email protected]> | 2023-07-17 21:52:01 +0206 |
|---|---|---|
| committer | Petr Mladek <[email protected]> | 2023-07-20 13:06:22 +0200 |
| commit | 6d3e0d8cc63221dec670d0ee92ac57961581e975 (patch) | |
| tree | 73b926b088fb8df780fb73a7828c6c984bb76bcc | |
| parent | 7ec85f3e089aa423a69559bf4555b6218b5a2ef7 (diff) | |
kdb: Do not assume write() callback available
It is allowed for consoles to not provide a write() callback. For
example ttynull does this.
Check if a write() callback is available before using it.
Signed-off-by: John Ogness <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Reviewed-by: Douglas Anderson <[email protected]>
Reviewed-by: Daniel Thompson <[email protected]>
Acked-by: Daniel Thompson <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
| -rw-r--r-- | kernel/debug/kdb/kdb_io.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/debug/kdb/kdb_io.c b/kernel/debug/kdb/kdb_io.c index 5c7e9ba7cd6b..e9139dfc1f0a 100644 --- a/kernel/debug/kdb/kdb_io.c +++ b/kernel/debug/kdb/kdb_io.c @@ -576,6 +576,8 @@ static void kdb_msg_write(const char *msg, int msg_len) continue; if (c == dbg_io_ops->cons) continue; + if (!c->write) + continue; /* * Set oops_in_progress to encourage the console drivers to * disregard their internal spin locks: in the current calling |