diff --git a/lib/librte_eal/common/include/rte_interrupts.h b/lib/librte_eal/common/include/rte_interrupts.h
index fd3c6ef..6cade01 100644
--- a/lib/librte_eal/common/include/rte_interrupts.h
+++ b/lib/librte_eal/common/include/rte_interrupts.h
@@ -70,7 +70,7 @@ typedef void (*rte_intr_callback_fn)(struct rte_intr_handle *intr_handle,
  *  - On success, zero.
  *  - On failure, a negative value.
  */
-int rte_intr_callback_register(struct rte_intr_handle *intr_handle,
+int rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
 				rte_intr_callback_fn cb, void *cb_arg);
 
 /**
@@ -88,7 +88,7 @@ int rte_intr_callback_register(struct rte_intr_handle *intr_handle,
  *  - On success, return the number of callback entities removed.
  *  - On failure, a negative value.
  */
-int rte_intr_callback_unregister(struct rte_intr_handle *intr_handle,
+int rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
 				rte_intr_callback_fn cb, void *cb_arg);
 
 /**
@@ -101,7 +101,7 @@ int rte_intr_callback_unregister(struct rte_intr_handle *intr_handle,
  *  - On success, zero.
  *  - On failure, a negative value.
  */
-int rte_intr_enable(struct rte_intr_handle *intr_handle);
+int rte_intr_enable(const struct rte_intr_handle *intr_handle);
 
 /**
  * It disables the interrupt for the specified handle.
@@ -113,7 +113,7 @@ int rte_intr_enable(struct rte_intr_handle *intr_handle);
  *  - On success, zero.
  *  - On failure, a negative value.
  */
-int rte_intr_disable(struct rte_intr_handle *intr_handle);
+int rte_intr_disable(const struct rte_intr_handle *intr_handle);
 
 #ifdef __cplusplus
 }
diff --git a/lib/librte_eal/linuxapp/eal/eal_interrupts.c b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
index 47a3b20..cb55751 100644
--- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c
+++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
@@ -136,7 +136,7 @@ static pthread_t intr_thread;
 
 /* enable legacy (INTx) interrupts */
 static int
-vfio_enable_intx(struct rte_intr_handle *intr_handle) {
+vfio_enable_intx(const struct rte_intr_handle *intr_handle) {
 	struct vfio_irq_set *irq_set;
 	char irq_set_buf[IRQ_SET_BUF_LEN];
 	int len, ret;
@@ -183,7 +183,7 @@ vfio_enable_intx(struct rte_intr_handle *intr_handle) {
 
 /* disable legacy (INTx) interrupts */
 static int
-vfio_disable_intx(struct rte_intr_handle *intr_handle) {
+vfio_disable_intx(const struct rte_intr_handle *intr_handle) {
 	struct vfio_irq_set *irq_set;
 	char irq_set_buf[IRQ_SET_BUF_LEN];
 	int len, ret;
@@ -226,7 +226,7 @@ vfio_disable_intx(struct rte_intr_handle *intr_handle) {
 
 /* enable MSI interrupts */
 static int
-vfio_enable_msi(struct rte_intr_handle *intr_handle) {
+vfio_enable_msi(const struct rte_intr_handle *intr_handle) {
 	int len, ret;
 	char irq_set_buf[IRQ_SET_BUF_LEN];
 	struct vfio_irq_set *irq_set;
@@ -255,7 +255,7 @@ vfio_enable_msi(struct rte_intr_handle *intr_handle) {
 
 /* disable MSI interrupts */
 static int
-vfio_disable_msi(struct rte_intr_handle *intr_handle) {
+vfio_disable_msi(const struct rte_intr_handle *intr_handle) {
 	struct vfio_irq_set *irq_set;
 	char irq_set_buf[IRQ_SET_BUF_LEN];
 	int len, ret;
@@ -278,9 +278,30 @@ vfio_disable_msi(struct rte_intr_handle *intr_handle) {
 	return ret;
 }
 
+static int
+get_max_intr(const struct rte_intr_handle *intr_handle)
+{
+	struct rte_intr_source *src;
+
+	TAILQ_FOREACH(src, &intr_sources, next) {
+		if (src->intr_handle.fd != intr_handle->fd)
+			continue;
+
+		if (!src->intr_handle.max_intr)
+			src->intr_handle.max_intr = 1;
+		else if (src->intr_handle.max_intr > RTE_MAX_RXTX_INTR_VEC_ID)
+			src->intr_handle.max_intr
+				= RTE_MAX_RXTX_INTR_VEC_ID + 1;
+
+		return src->intr_handle.max_intr;
+	}
+
+	return -1;
+}
+
 /* enable MSI-X interrupts */
 static int
-vfio_enable_msix(struct rte_intr_handle *intr_handle) {
+vfio_enable_msix(const struct rte_intr_handle *intr_handle) {
 	int len, ret;
 	char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
 	struct vfio_irq_set *irq_set;
@@ -290,12 +311,15 @@ vfio_enable_msix(struct rte_intr_handle *intr_handle) {
 
 	irq_set = (struct vfio_irq_set *) irq_set_buf;
 	irq_set->argsz = len;
-	if (!intr_handle->max_intr)
-		intr_handle->max_intr = 1;
-	else if (intr_handle->max_intr > RTE_MAX_RXTX_INTR_VEC_ID)
-		intr_handle->max_intr = RTE_MAX_RXTX_INTR_VEC_ID + 1;
 
-	irq_set->count = intr_handle->max_intr;
+	ret = get_max_intr(intr_handle);
+	if (ret < 0) {
+		RTE_LOG(ERR, EAL, "Invalid number of MSI-X irqs for fd %d\n",
+			intr_handle->fd);
+		return -1;
+	}
+
+	irq_set->count = ret;
 	irq_set->flags = VFIO_IRQ_SET_DATA_EVENTFD | VFIO_IRQ_SET_ACTION_TRIGGER;
 	irq_set->index = VFIO_PCI_MSIX_IRQ_INDEX;
 	irq_set->start = 0;
@@ -318,7 +342,7 @@ vfio_enable_msix(struct rte_intr_handle *intr_handle) {
 
 /* disable MSI-X interrupts */
 static int
-vfio_disable_msix(struct rte_intr_handle *intr_handle) {
+vfio_disable_msix(const struct rte_intr_handle *intr_handle) {
 	struct vfio_irq_set *irq_set;
 	char irq_set_buf[MSIX_IRQ_SET_BUF_LEN];
 	int len, ret;
@@ -343,7 +367,7 @@ vfio_disable_msix(struct rte_intr_handle *intr_handle) {
 #endif
 
 static int
-uio_intx_intr_disable(struct rte_intr_handle *intr_handle)
+uio_intx_intr_disable(const struct rte_intr_handle *intr_handle)
 {
 	unsigned char command_high;
 
@@ -367,7 +391,7 @@ uio_intx_intr_disable(struct rte_intr_handle *intr_handle)
 }
 
 static int
-uio_intx_intr_enable(struct rte_intr_handle *intr_handle)
+uio_intx_intr_enable(const struct rte_intr_handle *intr_handle)
 {
 	unsigned char command_high;
 
@@ -391,7 +415,7 @@ uio_intx_intr_enable(struct rte_intr_handle *intr_handle)
 }
 
 static int
-uio_intr_disable(struct rte_intr_handle *intr_handle)
+uio_intr_disable(const struct rte_intr_handle *intr_handle)
 {
 	const int value = 0;
 
@@ -405,7 +429,7 @@ uio_intr_disable(struct rte_intr_handle *intr_handle)
 }
 
 static int
-uio_intr_enable(struct rte_intr_handle *intr_handle)
+uio_intr_enable(const struct rte_intr_handle *intr_handle)
 {
 	const int value = 1;
 
@@ -419,7 +443,7 @@ uio_intr_enable(struct rte_intr_handle *intr_handle)
 }
 
 int
-rte_intr_callback_register(struct rte_intr_handle *intr_handle,
+rte_intr_callback_register(const struct rte_intr_handle *intr_handle,
 			rte_intr_callback_fn cb, void *cb_arg)
 {
 	int ret, wake_thread;
@@ -491,7 +515,7 @@ rte_intr_callback_register(struct rte_intr_handle *intr_handle,
 }
 
 int
-rte_intr_callback_unregister(struct rte_intr_handle *intr_handle,
+rte_intr_callback_unregister(const struct rte_intr_handle *intr_handle,
 			rte_intr_callback_fn cb_fn, void *cb_arg)
 {
 	int ret;
@@ -555,7 +579,7 @@ rte_intr_callback_unregister(struct rte_intr_handle *intr_handle,
 }
 
 int
-rte_intr_enable(struct rte_intr_handle *intr_handle)
+rte_intr_enable(const struct rte_intr_handle *intr_handle)
 {
 	if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 		return -1;
@@ -599,7 +623,7 @@ rte_intr_enable(struct rte_intr_handle *intr_handle)
 }
 
 int
-rte_intr_disable(struct rte_intr_handle *intr_handle)
+rte_intr_disable(const struct rte_intr_handle *intr_handle)
 {
 	if (!intr_handle || intr_handle->fd < 0 || intr_handle->uio_cfg_fd < 0)
 		return -1;
