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Commit 661382fe authored by Guennadi Liakhovetski's avatar Guennadi Liakhovetski Committed by Paul Mundt
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dma: shdma: don't register the global die notifier multiple times 



A recent patch has added a die notifier to the shdma driver, however,
it registers a static die-notifier object in the probe routine, i.e.,
for each device instance. This is wrong and leads to a system lockup.
This patch moves the die notifier registration to module init and
exit routines respectively.

Reported-by: default avatarMagnus Damm <damm@opensource.se>
Signed-off-by: default avatarGuennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: default avatarPaul Mundt <lethal@linux-sh.org>
parent 3c0cb7c3

drivers/dma/shdma.c

+7 −9
Original line number Diff line number Diff line
@@ -1110,11 +1110,6 @@ static int __init sh_dmae_probe(struct platform_device *pdev) 
	list_add_tail_rcu(&shdev->node, &sh_dmae_devices);

	spin_unlock_irqrestore(&sh_dmae_lock, flags);



	/* Wire up NMI handling before bringing the controller online */

	err = register_die_notifier(&sh_dmae_nmi_notifier);

	if (err)

		goto notifier_err;



	/* reset dma controller */

	err = sh_dmae_rst(shdev);

	if (err)
@@ -1218,8 +1213,6 @@ static int __init sh_dmae_probe(struct platform_device *pdev) 
eirq_err:

#endif

rst_err:

	unregister_die_notifier(&sh_dmae_nmi_notifier);

notifier_err:

	spin_lock_irqsave(&sh_dmae_lock, flags);

	list_del_rcu(&shdev->node);

	spin_unlock_irqrestore(&sh_dmae_lock, flags);
@@ -1252,8 +1245,6 @@ static int __exit sh_dmae_remove(struct platform_device *pdev) 
	if (errirq > 0)

		free_irq(errirq, shdev);



	unregister_die_notifier(&sh_dmae_nmi_notifier);



	spin_lock_irqsave(&sh_dmae_lock, flags);

	list_del_rcu(&shdev->node);

	spin_unlock_irqrestore(&sh_dmae_lock, flags);
@@ -1296,6 +1287,11 @@ static struct platform_driver sh_dmae_driver = { 


static int __init sh_dmae_init(void)

{

	/* Wire up NMI handling */

	int err = register_die_notifier(&sh_dmae_nmi_notifier);

	if (err)

		return err;



	return platform_driver_probe(&sh_dmae_driver, sh_dmae_probe);

}

module_init(sh_dmae_init);
@@ -1303,6 +1299,8 @@ module_init(sh_dmae_init); 
static void __exit sh_dmae_exit(void)

{

	platform_driver_unregister(&sh_dmae_driver);



	unregister_die_notifier(&sh_dmae_nmi_notifier);

}

module_exit(sh_dmae_exit);