[PATCH 10/24] Staging: ipack/bridges/tpci200: RCU protect slot_irq pointers.

[Samuel Iglesias Gonsalvez]

From: Jens Taprogge <jens.taprogge@xxxxxxxxxxxx>

In tpci200_request_irq as well as tpci200_free_irq we set and unset the
pointer to struct slot_irq.  This pointer is accessed in
tpci200_interrupt.  To ensure that the pointer is not freed after it has
been fetched in tpci200_interrupt() it is now protected through RCU.

Signed-off-by: Jens Taprogge <jens.taprogge@xxxxxxxxxxxx>
Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@xxxxxxxxxx>
---
 drivers/staging/ipack/bridges/tpci200.c |   10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/ipack/bridges/tpci200.c b/drivers/staging/ipack/bridges/tpci200.c
index 24e2a11..9ce577a 100644
--- a/drivers/staging/ipack/bridges/tpci200.c
+++ b/drivers/staging/ipack/bridges/tpci200.c
@@ -132,10 +132,11 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
 
 	if (status_reg & TPCI200_SLOT_INT_MASK) {
 		/* callback to the IRQ handler for the corresponding slot */
+		rcu_read_lock();
 		for (i = 0; i < TPCI200_NB_SLOT; i++) {
 			if (!(status_reg & ((TPCI200_A_INT0 | TPCI200_A_INT1) << (2*i))))
 				continue;
-			slot_irq = tpci200->slots[i].irq;
+			slot_irq = rcu_dereference(tpci200->slots[i].irq);
 			if (slot_irq) {
 				ret = tpci200_slot_irq(slot_irq);
 			} else {
@@ -147,6 +148,7 @@ static irqreturn_t tpci200_interrupt(int irq, void *dev_id)
 					TPCI200_INT0_EN | TPCI200_INT1_EN);
 			}
 		}
+		rcu_read_unlock();
 	}
 
 	return ret;
@@ -303,9 +305,9 @@ static int tpci200_free_irq(struct ipack_device *dev)
 
 	__tpci200_free_irq(tpci200, dev);
 	slot_irq = tpci200->slots[dev->slot].irq;
-	tpci200->slots[dev->slot].irq = NULL;
+	RCU_INIT_POINTER(tpci200->slots[dev->slot].irq, NULL);
+	synchronize_rcu();
 	kfree(slot_irq);
-
 	mutex_unlock(&tpci200->mutex);
 	return 0;
 }
@@ -490,7 +492,7 @@ static int tpci200_request_irq(struct ipack_device *dev, int vector,
 	slot_irq->arg = arg;
 	slot_irq->holder = dev;
 
-	tpci200->slots[dev->slot].irq = slot_irq;
+	rcu_assign_pointer(tpci200->slots[dev->slot].irq, slot_irq);
 	res = __tpci200_request_irq(tpci200, dev);
 
 out_unlock:
-- 
1.7.10.4

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