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| author |   Ingo Molnar <mingo@elte.hu> | 2014-03-07 14:58:39 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-03-08 22:24:53 -0800 |
| commit | ebade5e833eda30f648d9bf4954f7d47a920b60f (patch) | |
| tree | 9c767fdb3861ccfdde38564edff76adeef1c1882 /drivers/tty/synclinkmp.c | |
| parent | serial: 8250_pci: change BayTrail default uartclk (diff) | |
| download | linux-dev-ebade5e833eda30f648d9bf4954f7d47a920b60f.tar.xz linux-dev-ebade5e833eda30f648d9bf4954f7d47a920b60f.zip | |
serial: 8250: Clean up the locking for -rt
In -RT the spin_lock_irqsave() does not spin but sleep if the lock is
taken. Before that, local_irq_save() is invoked which disables
interrupts even on -RT. Therefore local_irq_save() + spin_lock() does not
work.
In the ->sysrq and oops_in_progress case it is save to trylock the lock
i.e. this is what we do now anyway except for ->sysrq where we assume
that the lock is already taken.
The spin_lock_irqsave() grabs the lock and disables the interrupts on
vanilla (the same behavior) and on -RT it won't disable interrupts.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
[bigeasy: add a patch description]
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/synclinkmp.c')
0 files changed, 0 insertions, 0 deletions