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kdb: remove unnecessary null check of dbg_io_ops 

`kdb_msg_write` operates on a global `struct kgdb_io *` called
`dbg_io_ops`.

It's initialized in `debug_core.c` and checked throughout the debug
flow.

There's a null check in `kdb_msg_write` which triggers static analyzers
and gives the (almost entirely wrong) impression that it can be null.

Coverity scanner caught this as CID 1465042.

I have removed the unnecessary null check and eliminated false-positive
forward null dereference warning.

Signed-off-by: Cengiz Can <cengiz@kernel.wtf>
Link: https://lore.kernel.org/r/20200630082922.28672-1-cengiz@kernel.wtf
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
This commit is contained in:
Cengiz Can 2020-06-30 11:29:23 +03:00 committed by Daniel Thompson
parent f75aef392f
commit fcdb84cc5b
1 changed files with 7 additions and 7 deletions
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14
kernel/debug/kdb/kdb_io.c
View File

@ -545,18 +545,18 @@ static int kdb_search_string(char *searched, char *searchfor)
static void kdb_msg_write(const char *msg, int msg_len)
{
struct console *c;
const char *cp;
int len;
if (msg_len == 0)
return;
if (dbg_io_ops) {
const char *cp = msg;
int len = msg_len;
cp = msg;
len = msg_len;
while (len--) {
dbg_io_ops->write_char(*cp);
cp++;
}
while (len--) {
dbg_io_ops->write_char(*cp);
cp++;
}
for_each_console(c) {