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authorMichael Neuling <mikey@neuling.org>2016-04-22 07:57:48 +0300
committerMichael Ellerman <mpe@ellerman.id.au>2016-04-27 05:04:31 +0300
commitd6776bba44d9752f6cdf640046070e71ee4bba7b (patch)
tree3ef01b47fc413a5ddb64d46d8ec18e92c65c9e25 /drivers/misc
parent4705e02498d6d5a7ab98dfee9595cd5e91db2017 (diff)
downloadlinux-d6776bba44d9752f6cdf640046070e71ee4bba7b.tar.xz
cxl: Keep IRQ mappings on context teardown
Keep IRQ mappings on context teardown. This won't leak IRQs as if we allocate the mapping again, the generic code will give the same mapping used last time. Doing this works around a race in the generic code. Masking the interrupt introduces a race which can crash the kernel or result in IRQ that is never EOIed. The lost of EOI results in all subsequent mappings to the same HW IRQ never receiving an interrupt. We've seen this race with cxl test cases which are doing heavy context startup and teardown at the same time as heavy interrupt load. A fix to the generic code is being investigated also. Signed-off-by: Michael Neuling <mikey@neuling.org> Cc: stable@vger.kernel.org # 3.8 Tested-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Acked-by: Ian Munsie <imunsie@au1.ibm.com> Tested-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/cxl/irq.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/misc/cxl/irq.c b/drivers/misc/cxl/irq.c
index be646dc41a2c..8def4553acba 100644
--- a/drivers/misc/cxl/irq.c
+++ b/drivers/misc/cxl/irq.c
@@ -203,7 +203,6 @@ unsigned int cxl_map_irq(struct cxl *adapter, irq_hw_number_t hwirq,
void cxl_unmap_irq(unsigned int virq, void *cookie)
{
free_irq(virq, cookie);
- irq_dispose_mapping(virq);
}
int cxl_register_one_irq(struct cxl *adapter,