tty/serial: lay the foundations for the next set of reworks
- Stop drivers calling their own flush method indirectly, it obfuscates code
and it will change soon anyway
- A few more lock_kernel paths temporarily needed in some driver internal
waiting code
- Remove private put_char method that does a write call for one char - we
have that anyway
- Most but not yet all of the termios copy under lock fixing (some has other
dependencies to follow)
- Note a few locking bugs in drivers found in the process
- Kill remaining [ab]users of TIOCG/SSOFTCAR in the driver, these must go to
fix the termios locking
Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/char/moxa.c b/drivers/char/moxa.c
index 1ab9517..585fac1 100644
--- a/drivers/char/moxa.c
+++ b/drivers/char/moxa.c
@@ -1280,6 +1280,7 @@
*/
if (ch == NULL)
return 0;
+ lock_kernel();
chars = MoxaPortTxQueue(ch);
if (chars) {
/*
@@ -1289,6 +1290,7 @@
if (!(ch->statusflags & EMPTYWAIT))
moxa_setup_empty_event(tty);
}
+ unlock_kernel();
return chars;
}