[dpdk-dev] [PATCH v2] bus/pci: update device devargs on each rescan

[Dariusz Stojaczyk <darek.stojaczyk@gmail.com>]

From: Darek Stojaczyk <dariusz.stojaczyk@intel.com>

Bus rescan is done e.g. during the device hotplug,
where devargs are re-allocated. By not updating the
rte_device->devargs pointer we potentially make it
a dangling one, as previous devargs could have been
(or will be soon) freed.

Fixes: 55e411b301c3 ("bus/pci: fix resource mapping override")
Cc: qi.z.zhang@intel.com

Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
---
Changes since v1:
  * introduce additional pci_devargs_lookup() check to make
    the code slightly more readable (Gaetan Rivet)

 drivers/bus/pci/linux/pci.c  |  5 +++++
 drivers/bus/pci/pci_common.c |  3 ++-
 drivers/bus/pci/private.h    | 11 +++++++++++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/pci/linux/pci.c b/drivers/bus/pci/linux/pci.c
index c99d523f0..a32d4848e 100644
--- a/drivers/bus/pci/linux/pci.c
+++ b/drivers/bus/pci/linux/pci.c
@@ -379,6 +379,11 @@ pci_scan_one(const char *dirname, const struct rte_pci_addr *addr)
 						RTE_LOG(ERR, EAL, "Unexpected device scan at %s!\n",
 							filename);
 				}
+
+				if (pci_devargs_lookup(dev2) !=
+						dev2->device.devargs)
+					pci_name_set(dev2);
+
 				free(dev);
 			}
 			return 0;
diff --git a/drivers/bus/pci/pci_common.c b/drivers/bus/pci/pci_common.c
index 6276e5d69..fcaf76ed2 100644
--- a/drivers/bus/pci/pci_common.c
+++ b/drivers/bus/pci/pci_common.c
@@ -42,7 +42,8 @@ const char *rte_pci_get_sysfs_path(void)
 	return path;
 }
 
-static struct rte_devargs *pci_devargs_lookup(struct rte_pci_device *dev)
+struct rte_devargs *
+pci_devargs_lookup(struct rte_pci_device *dev)
 {
 	struct rte_devargs *devargs;
 	struct rte_pci_addr addr;
diff --git a/drivers/bus/pci/private.h b/drivers/bus/pci/private.h
index 13c3324bb..8b2e904f0 100644
--- a/drivers/bus/pci/private.h
+++ b/drivers/bus/pci/private.h
@@ -43,6 +43,17 @@ void
 pci_name_set(struct rte_pci_device *dev);
 
 /**
+ * Find matching up-to-date devargs for a given device.
+ *
+ * @param pci_dev
+ *   PCI device
+ * @return
+ *   A devargs pointer or NULL
+ */
+struct rte_devargs *
+pci_devargs_lookup(struct rte_pci_device *dev);
+
+/**
  * Add a PCI device to the PCI Bus (append to PCI Device list). This function
  * also updates the bus references of the PCI Device (and the generic device
  * object embedded within.
-- 
2.11.0