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* [dpdk-stable] [PATCH v2] bus/pci: fix unexpected resource mapping override
@ 2018-10-27  3:20 Qi Zhang
  2018-10-28 23:26 ` [dpdk-stable] [dpdk-dev] " Thomas Monjalon
  0 siblings, 1 reply; 4+ messages in thread
From: Qi Zhang @ 2018-10-27  3:20 UTC (permalink / raw)
  To: dev
  Cc: anatoly.burakov, ferruh.yigit, geoffrey.lv, ajit.khaparde,
	Qi Zhang, stable

When scanning an already plugged device, the virtual address
of mapped PCI resource in rte_pci_device will be overridden
with 0, that may cause driver does not work correctly.
The fix is not to update any rte_pci_device's field if the being
scanned device's driver is already probed.

Bugzilla ID: 85
Fixes: c752998b5e2e ("pci: introduce library and driver")
Cc: stable@dpdk.org

Reported-by: Lv Geoffrey <geoffrey.lv@gmail.com>
Signed-off-by: Qi Zhang <qi.z.zhang@intel.com>
---

v2:
- use rte_dev_is_probed.
- reword comment.

 drivers/bus/pci/linux/pci.c | 35 ++++++++++++++++++++++++++++++-----
 1 file changed, 30 insertions(+), 5 deletions(-)

diff --git a/drivers/bus/pci/linux/pci.c b/drivers/bus/pci/linux/pci.c
index 145cb1091..f3175fb2b 100644
--- a/drivers/bus/pci/linux/pci.c
+++ b/drivers/bus/pci/linux/pci.c
@@ -349,11 +349,36 @@ pci_scan_one(const char *dirname, const struct rte_pci_addr *addr)
 			if (ret < 0) {
 				rte_pci_insert_device(dev2, dev);
 			} else { /* already registered */
-				dev2->kdrv = dev->kdrv;
-				dev2->max_vfs = dev->max_vfs;
-				pci_name_set(dev2);
-				memmove(dev2->mem_resource, dev->mem_resource,
-					sizeof(dev->mem_resource));
+				if (!rte_dev_is_probed(dev2)) {
+					dev2->kdrv = dev->kdrv;
+					dev2->max_vfs = dev->max_vfs;
+					pci_name_set(dev2);
+					memmove(dev2->mem_resource,
+						dev->mem_resource,
+						sizeof(dev->mem_resource));
+				} else {
+					/**
+					 * If device is plugged and driver is
+					 * probed already, (This happens when we
+					 * call rte_dev_probe which will scan all
+					 * device on the bus) we don't need
+					 * to do anything here unless...
+					 **/
+					if (dev2->kdrv != dev->kdrv ||
+						dev2->max_vfs != dev->max_vfs)
+						/*
+						 * This should not happens.
+						 * But it is still possible if
+						 * we unbind a device from
+						 * vfio or uio before hotplug
+						 * remove and rebind it with
+						 * a different configure.
+						 * So we just print out the
+						 * error as an alarm.
+						 */
+						RTE_LOG(ERR, EAL, "Unexpected device scan at %s!\n",
+							filename);
+				}
 				free(dev);
 			}
 			return 0;
-- 
2.13.6

^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2018-10-31 18:24 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2018-10-27  3:20 [dpdk-stable] [PATCH v2] bus/pci: fix unexpected resource mapping override Qi Zhang
2018-10-28 23:26 ` [dpdk-stable] [dpdk-dev] " Thomas Monjalon
2018-10-30 15:19   ` Zhang, Qi Z
2018-10-31 18:24     ` Thomas Monjalon

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