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Merge branch 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

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* 'tracing-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  ftrace: Fix unmatched locking in ftrace_regex_write()
  ring-buffer: Synchronize resizing buffer with reader lock
This commit is contained in:
Linus Torvalds 2009-11-05 10:56:25 -08:00
commit 72cc129e8d
2 changed files with 5 additions and 3 deletions
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6
kernel/trace/ftrace.c
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@ -2222,15 +2222,15 @@ ftrace_regex_write(struct file *file, const char __user *ubuf,
ret = ftrace_process_regex(parser->buffer, ret = ftrace_process_regex(parser->buffer,
parser->idx, enable); parser->idx, enable);
if (ret) if (ret)
goto out; goto out_unlock;
trace_parser_clear(parser); trace_parser_clear(parser);
} }
ret = read; ret = read;
out_unlock:
mutex_unlock(&ftrace_regex_lock); mutex_unlock(&ftrace_regex_lock);
out:
return ret; return ret;
} }

2
kernel/trace/ring_buffer.c
View file

@ -1193,6 +1193,7 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
atomic_inc(&cpu_buffer->record_disabled); atomic_inc(&cpu_buffer->record_disabled);
synchronize_sched(); synchronize_sched();
spin_lock_irq(&cpu_buffer->reader_lock);
rb_head_page_deactivate(cpu_buffer); rb_head_page_deactivate(cpu_buffer);
for (i = 0; i < nr_pages; i++) { for (i = 0; i < nr_pages; i++) {
@ -1207,6 +1208,7 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned nr_pages)
return; return;
rb_reset_cpu(cpu_buffer); rb_reset_cpu(cpu_buffer);
spin_unlock_irq(&cpu_buffer->reader_lock);
rb_check_pages(cpu_buffer); rb_check_pages(cpu_buffer);