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NULL pointer might be used in ips_monitor()

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The patch is to create ips_adjust thread before ips_monitor begins
 to run  because the latter will kthread_stop() or wake up the former
 via ips->adjust pointer. Without this change, it is possible that
 ips->adjust is NULL when kthread_stop() or wake_up_process() is
 called in ips_monitor().

Signed-off-by: minskey guo <chaohong.guo@intel.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
minskey guo 2010-09-17 14:03:27 +08:00 committed by Matthew Garrett
parent fed522f7ea
commit a7abda8d72
1 changed files with 15 additions and 11 deletions
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26
drivers/platform/x86/intel_ips.c
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@ -940,7 +940,6 @@ static int ips_monitor(void *data)
kfree(mch_samples);
kfree(cpu_samples);
kfree(mchp_samples);
kthread_stop(ips->adjust);
return -ENOMEM;
}
@ -1535,20 +1534,25 @@ static int ips_probe(struct pci_dev *dev, const struct pci_device_id *id)
ips_enable_cpu_turbo(ips);
ips->cpu_turbo_enabled = true;
/* Set up the work queue and monitor/adjust threads */
ips->monitor = kthread_run(ips_monitor, ips, "ips-monitor");
if (IS_ERR(ips->monitor)) {
dev_err(&dev->dev,
"failed to create thermal monitor thread, aborting\n");
ret = -ENOMEM;
goto error_free_irq;
}
/* Create thermal adjust thread */
ips->adjust = kthread_create(ips_adjust, ips, "ips-adjust");
if (IS_ERR(ips->adjust)) {
dev_err(&dev->dev,
"failed to create thermal adjust thread, aborting\n");
ret = -ENOMEM;
goto error_free_irq;
}
/*
* Set up the work queue and monitor thread. The monitor thread
* will wake up ips_adjust thread.
*/
ips->monitor = kthread_run(ips_monitor, ips, "ips-monitor");
if (IS_ERR(ips->monitor)) {
dev_err(&dev->dev,
"failed to create thermal monitor thread, aborting\n");
ret = -ENOMEM;
goto error_thread_cleanup;
}
@ -1566,7 +1570,7 @@ static int ips_probe(struct pci_dev *dev, const struct pci_device_id *id)
return ret;
error_thread_cleanup:
kthread_stop(ips->monitor);
kthread_stop(ips->adjust);
error_free_irq:
free_irq(ips->dev->irq, ips);
error_unmap: