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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2013-06-04 23:13:29 +0200 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2013-06-10 14:43:37 +0200 |
| commit | 09e99da766a6a701eb4d72004872d1144291d53b (patch) | |
| tree | cbf87ed10f6c64c7669ddd68e539e6d3b474e546 /arch/x86/xen | |
| parent | xen/time: Check that the per_cpu data structure has data before freeing. (diff) | |
| download | linux-09e99da766a6a701eb4d72004872d1144291d53b.tar.xz linux-09e99da766a6a701eb4d72004872d1144291d53b.zip | |
xen/time: Free onlined per-cpu data structure if we want to online it again.
If the per-cpu time data structure has been onlined already and
we are trying to online it again, then free the previous copy
before blindly over-writting it.
A developer naturally should not call this function multiple times
but just in case.
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/xen')
| -rw-r--r-- | arch/x86/xen/time.c | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c index 6a56ae092994..aec0b14b6d76 100644 --- a/arch/x86/xen/time.c +++ b/arch/x86/xen/time.c @@ -401,6 +401,20 @@ static irqreturn_t xen_timer_interrupt(int irq, void *dev_id) return ret; } +void xen_teardown_timer(int cpu) +{ + struct clock_event_device *evt; + BUG_ON(cpu == 0); + evt = &per_cpu(xen_clock_events, cpu).evt; + + if (evt->irq >= 0) { + unbind_from_irqhandler(evt->irq, NULL); + evt->irq = -1; + kfree(per_cpu(xen_clock_events, cpu).name); + per_cpu(xen_clock_events, cpu).name = NULL; + } +} + void xen_setup_timer(int cpu) { char *name; @@ -409,6 +423,8 @@ void xen_setup_timer(int cpu) evt = &per_cpu(xen_clock_events, cpu).evt; WARN(evt->irq >= 0, "IRQ%d for CPU%d is already allocated\n", evt->irq, cpu); + if (evt->irq >= 0) + xen_teardown_timer(cpu); printk(KERN_INFO "installing Xen timer for CPU %d\n", cpu); @@ -429,19 +445,6 @@ void xen_setup_timer(int cpu) per_cpu(xen_clock_events, cpu).name = name; } -void xen_teardown_timer(int cpu) -{ - struct clock_event_device *evt; - BUG_ON(cpu == 0); - evt = &per_cpu(xen_clock_events, cpu).evt; - - if (evt->irq >= 0) { - unbind_from_irqhandler(evt->irq, NULL); - evt->irq = -1; - kfree(per_cpu(xen_clock_events, cpu).name); - per_cpu(xen_clock_events, cpu).name = NULL; - } -} void xen_setup_cpu_clockevents(void) { |