Patchwork [107/150] USB: mos7840: fix broken TIOCMIWAIT

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Submitter Luis Henriques
Date March 26, 2013, 3:20 p.m.
Message ID <1364311249-14454-108-git-send-email-luis.henriques@canonical.com>
Download mbox | patch
Permalink /patch/231363/
State New
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Luis Henriques - March 26, 2013, 3:20 p.m.
3.5.7.9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <jhovold@gmail.com>

commit e670c6af12517d08a403487b1122eecf506021cf upstream.

Make sure waiting processes are woken on modem-status changes.

Currently processes are only woken on termios changes regardless of
whether the modem status has changed.

Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ luis: adjust context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
---
 drivers/usb/serial/mos7840.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/usb/serial/mos7840.c b/drivers/usb/serial/mos7840.c
index 1b5ea51..be5f09b 100644
--- a/drivers/usb/serial/mos7840.c
+++ b/drivers/usb/serial/mos7840.c
@@ -442,6 +442,9 @@  static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
 			icount->rng++;
 			smp_wmb();
 		}
+
+		mos7840_port->delta_msr_cond = 1;
+		wake_up_interruptible(&mos7840_port->delta_msr_wait);
 	}
 }
 
@@ -2096,8 +2099,6 @@  static void mos7840_change_port_settings(struct tty_struct *tty,
 			mos7840_port->read_urb_busy = false;
 		}
 	}
-	wake_up(&mos7840_port->delta_msr_wait);
-	mos7840_port->delta_msr_cond = 1;
 	dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
 	    mos7840_port->shadowLCR);
 }