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    SubjectRe: [PATCH v2 1/6] TTY: serial, remove BTM from wait_until_sent
    On 08/10/2011 03:09 AM, Andreas Bombe wrote:
    > On Mon, Aug 08, 2011 at 03:21:22PM +0200, Jiri Slaby wrote:
    >> On 07/19/2011 02:35 AM, Andreas Bombe wrote:
    >>> On Thu, Jul 14, 2011 at 02:35:10PM +0200, Jiri Slaby wrote:
    >>>> This should also fix the issue Andreas is seeing (BTM in comparison to
    >>>> BKL doesn't have any hidden functionality like unlocking during
    >>>> sleeping).
    >>>
    >>> I tested the patch series and it does not appear to make a difference
    >>> for the internal (16550A) serial ports on my system. Also, I am still
    >>> unclear on why it freezes the X display during the timeout period.
    >>
    >> Sorry for the delay. Could you attach output of sysrq-t when this
    >> happens? I mean with a kernel patched by my patch.
    >
    > I did my simple test on ttyS0 again: "stty -F /dev/ttyS0 crtscts" then
    > "echo >/dev/ttyS0". I attached the gzipped sysrq-t list in case you need
    > the complete output. This is just the process while it is trying to
    > close the device (bash's internal echo):
    >
    > [ 321.948012] bash S ffff8800bcc85e80 0 4000 2828 0x00000000
    > [ 321.948012] ffff880127079c38 0000000000000046 ffff880127079c50 0000000100002fff
    > [ 321.948012] ffff880127079fd8 0000000000011fc0 ffff880127079fd8 0000000000011fc0
    > [ 321.948012] ffff8801270dde80 ffff8800bcc85e80 ffff880127079c38 0000000100002fff
    > [ 321.948012] Call Trace:
    > [ 321.948012] [<ffffffff813cdf2e>] schedule_timeout+0xb5/0xf2
    > [ 321.948012] [<ffffffff8104ae2b>] ? call_timer_fn+0x154/0x154
    > [ 321.948012] [<ffffffff81255d60>] tty_wait_until_sent+0xa3/0xec
    > [ 321.948012] [<ffffffff8105a190>] ? __init_waitqueue_head+0x46/0x46
    > [ 321.948012] [<ffffffff81268c05>] uart_close+0x12b/0x243
    > [ 321.948012] [<ffffffff81250454>] ? __tty_fasync+0x5c/0x124
    > [ 321.948012] [<ffffffff81251a00>] tty_release+0x1d3/0x4d7
    > [ 321.948012] [<ffffffff813cfbd8>] ? _raw_spin_unlock+0x43/0x51
    > [ 321.948012] [<ffffffff8110db81>] ? dput+0xfe/0x11d
    > [ 321.948012] [<ffffffff810fdc86>] __fput+0x107/0x1a2
    > [ 321.948012] [<ffffffff810fdd36>] fput+0x15/0x17
    > [ 321.948012] [<ffffffff810fb014>] filp_close+0x69/0x75
    > [ 321.948012] [<ffffffff81109654>] sys_dup3+0x12b/0x153
    > [ 321.948012] [<ffffffff811096d5>] sys_dup2+0x59/0x60
    > [ 321.948012] [<ffffffff813d0a12>] system_call_fastpath+0x16/0x1b
    >
    >
    > [ 321.948012] Sched Debug Version: v0.10, 3.1.0-rc1+ser-00011-g37ed45d #87

    What tree is this? I cannot see the path through the code.

    thanks,
    --
    js
    suse labs


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