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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2014-05-23 11:41:06 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-28 22:33:18 +0200 |
| commit | 15a2743193b099f82657ca315dd2e1091be6c1d3 (patch) | |
| tree | 3f60a997cf6f16460ff200e351fa3ae223a680ed /drivers/tty/hvc/hvc_console.c | |
| parent | drivers/tty/n_hdlc.c: replace kmalloc/memset by kzalloc (diff) | |
| download | linux-15a2743193b099f82657ca315dd2e1091be6c1d3.tar.xz linux-15a2743193b099f82657ca315dd2e1091be6c1d3.zip | |
tty/hvc/hvc_console: Fix wakeup of HVC thread on hvc_kick()
Some backends call hvc_kick() to wakeup the HVC thread from its
slumber upon incoming characters. This however doesn't work
properly because it uses msleep_interruptible() which is mostly
immune to wake_up_process(). It will basically go back to sleep
until the timeout is expired (only signals can really wake it).
Replace it with a simple shedule_timeout_interruptible() instead,
which may wakeup earlier every now and then but we really don't
care in this case.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/hvc/hvc_console.c')
| -rw-r--r-- | drivers/tty/hvc/hvc_console.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/tty/hvc/hvc_console.c b/drivers/tty/hvc/hvc_console.c index 94f9e3a38412..10942655a79d 100644 --- a/drivers/tty/hvc/hvc_console.c +++ b/drivers/tty/hvc/hvc_console.c @@ -760,10 +760,17 @@ static int khvcd(void *unused) if (poll_mask == 0) schedule(); else { + unsigned long j_timeout; + if (timeout < MAX_TIMEOUT) timeout += (timeout >> 6) + 1; - msleep_interruptible(timeout); + /* + * We don't use msleep_interruptible otherwise + * "kick" will fail to wake us up + */ + j_timeout = msecs_to_jiffies(timeout) + 1; + schedule_timeout_interruptible(j_timeout); } } __set_current_state(TASK_RUNNING); |