From: Wei Hu <weh@microsoft.com>
To: kys@microsoft.com, haiyangz@microsoft.com,
sthemmin@microsoft.com, wei.liu@kernel.org,
lorenzo.pieralisi@arm.com, robh@kernel.org, bhelgaas@google.com,
linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org, decui@microsoft.com,
mikelley@microsoft.com
Cc: Wei Hu <weh@microsoft.com>
Subject: [PATCH v2 1/2] PCI: hv: Fix the PCI HyperV probe failure path to release resource properly
Date: Fri, 1 May 2020 13:36:17 +0800 [thread overview]
Message-ID: <20200501053617.24689-1-weh@microsoft.com> (raw)
Some error cases in hv_pci_probe() were not handled. Fix these error
paths to release the resourses and clean up the state properly.
Signed-off-by: Wei Hu <weh@microsoft.com>
---
drivers/pci/controller/pci-hyperv.c | 20 ++++++++++++++++----
1 file changed, 16 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
index e15022ff63e3..e6fac0187722 100644
--- a/drivers/pci/controller/pci-hyperv.c
+++ b/drivers/pci/controller/pci-hyperv.c
@@ -480,6 +480,9 @@ struct hv_pcibus_device {
struct workqueue_struct *wq;
+ /* Highest slot of child device with resources allocated */
+ int wslot_res_allocated;
+
/* hypercall arg, must not cross page boundary */
struct hv_retarget_device_interrupt retarget_msi_interrupt_params;
@@ -2847,7 +2850,7 @@ static int hv_send_resources_allocated(struct hv_device *hdev)
struct hv_pci_dev *hpdev;
struct pci_packet *pkt;
size_t size_res;
- u32 wslot;
+ int wslot;
int ret;
size_res = (hbus->protocol_version < PCI_PROTOCOL_VERSION_1_2)
@@ -2900,6 +2903,8 @@ static int hv_send_resources_allocated(struct hv_device *hdev)
comp_pkt.completion_status);
break;
}
+
+ hbus->wslot_res_allocated = wslot;
}
kfree(pkt);
@@ -2918,10 +2923,10 @@ static int hv_send_resources_released(struct hv_device *hdev)
struct hv_pcibus_device *hbus = hv_get_drvdata(hdev);
struct pci_child_message pkt;
struct hv_pci_dev *hpdev;
- u32 wslot;
+ int wslot;
int ret;
- for (wslot = 0; wslot < 256; wslot++) {
+ for (wslot = hbus->wslot_res_allocated; wslot >= 0; wslot--) {
hpdev = get_pcichild_wslot(hbus, wslot);
if (!hpdev)
continue;
@@ -2936,8 +2941,12 @@ static int hv_send_resources_released(struct hv_device *hdev)
VM_PKT_DATA_INBAND, 0);
if (ret)
return ret;
+
+ hbus->wslot_res_allocated = wslot - 1;
}
+ hbus->wslot_res_allocated = -1;
+
return 0;
}
@@ -3037,6 +3046,7 @@ static int hv_pci_probe(struct hv_device *hdev,
if (!hbus)
return -ENOMEM;
hbus->state = hv_pcibus_init;
+ hbus->wslot_res_allocated = -1;
/*
* The PCI bus "domain" is what is called "segment" in ACPI and other
@@ -3136,7 +3146,7 @@ static int hv_pci_probe(struct hv_device *hdev,
ret = hv_pci_allocate_bridge_windows(hbus);
if (ret)
- goto free_irq_domain;
+ goto exit_d0;
ret = hv_send_resources_allocated(hdev);
if (ret)
@@ -3154,6 +3164,8 @@ static int hv_pci_probe(struct hv_device *hdev,
free_windows:
hv_pci_free_bridge_windows(hbus);
+exit_d0:
+ (void) hv_pci_bus_exit(hdev, true);
free_irq_domain:
irq_domain_remove(hbus->irq_domain);
free_fwnode:
--
2.20.1
next reply other threads:[~2020-05-01 5:36 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 5:36 Wei Hu [this message]
2020-05-04 23:42 ` [PATCH v2 1/2] PCI: hv: Fix the PCI HyperV probe failure path to release resource properly Michael Kelley
2020-05-05 15:03 ` Lorenzo Pieralisi
2020-05-06 5:36 ` Wei Hu
2020-05-06 11:09 ` Lorenzo Pieralisi
2020-05-06 13:21 ` Wei Hu
2020-05-06 14:55 ` Michael Kelley
2020-05-06 15:21 ` Lorenzo Pieralisi
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