Revert "8250: Fix tcsetattr to avoid ioctl(TIOCMIWAIT) hang"
This reverts commit 47d3904fe40d62deee8cd46e79ca784e7a548acd.
Crashes any x86 serial console bootup:
Console: colour VGA+ 80x25
BUG: unable to handle kernel NULL pointer dereference at 0000000000000158
IP: [<ffffffff811ebcb4>] serial8250_do_set_termios+0x1d4/0x430
...
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Greg KH <gregkh@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/serial/8250.c b/drivers/serial/8250.c
index dd5e1ac..4d8e14b 100644
--- a/drivers/serial/8250.c
+++ b/drivers/serial/8250.c
@@ -2343,11 +2343,8 @@
/*
* CTS flow control flag and modem status interrupts
- * Only disable MSI if no threads are waiting in
- * serial_core::uart_wait_modem_status
*/
- if (!waitqueue_active(&up->port.state->port.delta_msr_wait))
- up->ier &= ~UART_IER_MSI;
+ up->ier &= ~UART_IER_MSI;
if (!(up->bugs & UART_BUG_NOMSR) &&
UART_ENABLE_MS(&up->port, termios->c_cflag))
up->ier |= UART_IER_MSI;