linux-kernel - [PATCH 4.2.y-ckt 18/59] cxl: Keep IRQ mappings on context teardown

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Message-Id: <1462823777-8384-19-git-send-email-kamal@canonical.com>
Date:	Mon,  9 May 2016 12:55:36 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Michael Neuling <mikey@...ling.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 18/59] cxl: Keep IRQ mappings on context teardown

4.2.8-ckt10 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: Michael Neuling <mikey@...ling.org>

commit d6776bba44d9752f6cdf640046070e71ee4bba7b upstream.

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@...ling.org>
Tested-by: Andrew Donnellan <andrew.donnellan@....ibm.com>
Acked-by: Ian Munsie <imunsie@....ibm.com>
Tested-by: Vaibhav Jain <vaibhav@...ux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 drivers/misc/cxl/irq.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/misc/cxl/irq.c b/drivers/misc/cxl/irq.c
index 680cd26..8a6b710 100644
--- a/drivers/misc/cxl/irq.c
+++ b/drivers/misc/cxl/irq.c
@@ -288,7 +288,6 @@ 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);
 }

 static int cxl_register_one_irq(struct cxl *adapter,
-- 
2.7.4