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Revert "8250: Fix tcsetattr to avoid ioctl(TIOCMIWAIT) hang"

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This reverts commit 47d3904fe4.

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>
This commit is contained in:
Ingo Molnar 2010-11-13 16:21:58 +01:00 committed by Linus Torvalds
parent c0caf7bcbf
commit f8b372a11c
1 changed files with 1 additions and 4 deletions
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5
drivers/serial/8250.c
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@ -2343,11 +2343,8 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios,
/*
* 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;