From 64de7e4069b9b84b0f2d840b44e334233412d55f Mon Sep 17 00:00:00 2001 From: Gaetan Rivet Date: Fri, 27 Apr 2018 16:13:05 +0200 Subject: [PATCH] bus/pci: fix find device implementation If start is set, and a device before it matches the data passed for comparison, then this first device is returned. This induces potentially infinite loops. Fixes: c7fe1eea8a74 ("bus: simplify finding starting point") Cc: stable@dpdk.org Signed-off-by: Gaetan Rivet --- drivers/bus/pci/pci_common.c | 21 ++++++++++++--------- drivers/bus/pci/rte_bus_pci.h | 3 +++ 2 files changed, 15 insertions(+), 9 deletions(-) diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c index 6bed0bc9dc..7215aaec3a 100644 --- a/drivers/bus/pci/pci_common.c +++ b/drivers/bus/pci/pci_common.c @@ -455,17 +455,20 @@ static struct rte_device * pci_find_device(const struct rte_device *start, rte_dev_cmp_t cmp, const void *data) { - struct rte_pci_device *dev; + const struct rte_pci_device *pstart; + struct rte_pci_device *pdev; - FOREACH_DEVICE_ON_PCIBUS(dev) { - if (start && &dev->device == start) { - start = NULL; /* starting point found */ - continue; - } - if (cmp(&dev->device, data) == 0) - return &dev->device; + if (start != NULL) { + pstart = RTE_DEV_TO_PCI_CONST(start); + pdev = TAILQ_NEXT(pstart, next); + } else { + pdev = TAILQ_FIRST(&rte_pci_bus.device_list); + } + while (pdev != NULL) { + if (cmp(&pdev->device, data) == 0) + return &pdev->device; + pdev = TAILQ_NEXT(pdev, next); } - return NULL; } diff --git a/drivers/bus/pci/rte_bus_pci.h b/drivers/bus/pci/rte_bus_pci.h index 357afb912e..458e6d0763 100644 --- a/drivers/bus/pci/rte_bus_pci.h +++ b/drivers/bus/pci/rte_bus_pci.h @@ -74,6 +74,9 @@ struct rte_pci_device { */ #define RTE_DEV_TO_PCI(ptr) container_of(ptr, struct rte_pci_device, device) +#define RTE_DEV_TO_PCI_CONST(ptr) \ + container_of(ptr, const struct rte_pci_device, device) + #define RTE_ETH_DEV_TO_PCI(eth_dev) RTE_DEV_TO_PCI((eth_dev)->device) /** Any PCI device identifier (vendor, device, ...) */ -- 2.20.1