vfio: keep interrupt source read only

Remove the inappropriate modification on get_max_intr
field that keep the intr_source read only.

Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
Acked-by: Anatoly  Burakov <anatoly.burakov@intel.com>

diff --git a/lib/librte_eal/linuxapp/eal/eal_interrupts.c b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
index e293728..3069779 100644 (file)
--- a/lib/librte_eal/linuxapp/eal/eal_interrupts.c
+++ b/lib/librte_eal/linuxapp/eal/eal_interrupts.c
@@ -279,29 +279,6 @@ vfio_disable_msi(const 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 < intr_handle->max_intr)
-                       src->intr_handle.max_intr = intr_handle->max_intr;
-               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(const struct rte_intr_handle *intr_handle) {
@@ -314,15 +291,10 @@ vfio_enable_msix(const struct rte_intr_handle *intr_handle) {
 
        irq_set = (struct vfio_irq_set *) irq_set_buf;
        irq_set->argsz = len;
-
-       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;
+       /* 0 < irq_set->count < RTE_MAX_RXTX_INTR_VEC_ID + 1 */
+       irq_set->count = intr_handle->max_intr ?
+               (intr_handle->max_intr > RTE_MAX_RXTX_INTR_VEC_ID + 1 ?
+               RTE_MAX_RXTX_INTR_VEC_ID + 1 : intr_handle->max_intr) : 1;
        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;