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iommu/amd: WARN when __[attach|detach]_device are called with irqs enabled 

These functions rely on being called with IRQs disabled. Add
a WARN_ON to detect early when its not.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
hifive-unleashed-5.1
Joerg Roedel 2015-10-20 17:33:37 +02:00
parent f1dd0a8bcd
commit 272e4f99e9
1 changed files with 12 additions and 0 deletions
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12
drivers/iommu/amd_iommu.c
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@ -2030,6 +2030,12 @@ static int __attach_device(struct iommu_dev_data *dev_data,
{
int ret;
/*
* Must be called with IRQs disabled. Warn here to detect early
* when its not.
*/
WARN_ON(!irqs_disabled());
/* lock domain */
spin_lock(&domain->lock);
@ -2190,6 +2196,12 @@ static void __detach_device(struct iommu_dev_data *dev_data)
{
struct protection_domain *domain;
/*
* Must be called with IRQs disabled. Warn here to detect early
* when its not.
*/
WARN_ON(!irqs_disabled());
if (WARN_ON(!dev_data->domain))
return;