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tracing: Add proper check for irq_depth routines 

The check_irq_entry and check_irq_return could be called
from graph event context. In such case there's no graph
private data allocated. Adding checks to handle this case.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
LKML-Reference: <20100924154102.GB1818@jolsa.brq.redhat.com>

[ Fixed some grammar in the comments ]

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jiri Olsa 2010-09-24 17:41:02 +02:00 committed by Steven Rostedt
parent 907f278409
commit a9d61173dc
1 changed files with 20 additions and 4 deletions
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24
kernel/trace/trace_functions_graph.c
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@ -888,12 +888,20 @@ check_irq_entry(struct trace_iterator *iter, u32 flags,
unsigned long addr, int depth)
{
int cpu = iter->cpu;
int *depth_irq;
struct fgraph_data *data = iter->private;
int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
if (flags & TRACE_GRAPH_PRINT_IRQS)
/*
* If we are either displaying irqs, or we got called as
* a graph event and private data does not exist,
* then we bypass the irq check.
*/
if ((flags & TRACE_GRAPH_PRINT_IRQS) ||
(!data))
return 0;
depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
/*
* We are inside the irq code
*/
@ -926,12 +934,20 @@ static int
check_irq_return(struct trace_iterator *iter, u32 flags, int depth)
{
int cpu = iter->cpu;
int *depth_irq;
struct fgraph_data *data = iter->private;
int *depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
if (flags & TRACE_GRAPH_PRINT_IRQS)
/*
* If we are either displaying irqs, or we got called as
* a graph event and private data does not exist,
* then we bypass the irq check.
*/
if ((flags & TRACE_GRAPH_PRINT_IRQS) ||
(!data))
return 0;
depth_irq = &(per_cpu_ptr(data->cpu_data, cpu)->depth_irq);
/*
* We are not inside the irq code.
*/