luck/tmp_suning_uos_patched
1
0
Fork 1
Code Issues Pull Requests Packages Projects Releases Wiki Activity

genirq/irqdomain: Don't try to free an interrupt that has no mapping

Browse Source 
[ Upstream commit 4615fbc3788ddc8e7c6d697714ad35a53729aa2c ]

When an interrupt allocation fails for N interrupts, it is pretty
common for the error handling code to free the same number of interrupts,
no matter how many interrupts have actually been allocated.

This may result in the domain freeing code to be unexpectedly called
for interrupts that have no mapping in that domain. Things end pretty
badly.

Instead, add some checks to irq_domain_free_irqs_hierarchy() to make sure
that thiss does not follow the hierarchy if no mapping exists for a given
interrupt.

Fixes: 6a6544e520 ("genirq/irqdomain: Remove auto-recursive hierarchy support")
Signed-off-by: Marc Zyngier <maz@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20201129135551.396777-1-maz@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Marc Zyngier 2020-11-29 13:55:51 +00:00 committed by Greg Kroah-Hartman
parent 891bb86926
commit f11ebb7651
1 changed files with 9 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
kernel/irq/irqdomain.c
View File

@ -1373,8 +1373,15 @@ static void irq_domain_free_irqs_hierarchy(struct irq_domain *domain,
unsigned int irq_base,
unsigned int nr_irqs)
{
if (domain->ops->free)
domain->ops->free(domain, irq_base, nr_irqs);
unsigned int i;
if (!domain->ops->free)
return;
for (i = 0; i < nr_irqs; i++) {
if (irq_domain_get_irq_data(domain, irq_base + i))
domain->ops->free(domain, irq_base + i, 1);
}
}
int irq_domain_alloc_irqs_hierarchy(struct irq_domain *domain,