From: Dmitry Torokhov Date: Fri, 10 Jan 2014 00:02:33 +0000 (-0800) Subject: VMCI: fix error handling path when registering guest driver X-Git-Tag: firefly_0821_release~176^2~4628^2~3 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=782f24453536460482f9dd14d3677ade910b1fd1;p=firefly-linux-kernel-4.4.55.git VMCI: fix error handling path when registering guest driver When host capabilities check failed or when we were unable to register doorbell bitmap we were forgetting to set error code and were returning 0 which would make upper layers believe that probe was successful. Reported-by: Julia Lawall Acked-by: Andy King Signed-off-by: Dmitry Torokhov Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/misc/vmw_vmci/vmci_guest.c b/drivers/misc/vmw_vmci/vmci_guest.c index c98b03b99353..d35cda06b5e8 100644 --- a/drivers/misc/vmw_vmci/vmci_guest.c +++ b/drivers/misc/vmw_vmci/vmci_guest.c @@ -165,7 +165,7 @@ static void vmci_guest_cid_update(u32 sub_id, * true if required hypercalls (or fallback hypercalls) are * supported by the host, false otherwise. */ -static bool vmci_check_host_caps(struct pci_dev *pdev) +static int vmci_check_host_caps(struct pci_dev *pdev) { bool result; struct vmci_resource_query_msg *msg; @@ -176,7 +176,7 @@ static bool vmci_check_host_caps(struct pci_dev *pdev) check_msg = kmalloc(msg_size, GFP_KERNEL); if (!check_msg) { dev_err(&pdev->dev, "%s: Insufficient memory\n", __func__); - return false; + return -ENOMEM; } check_msg->dst = vmci_make_handle(VMCI_HYPERVISOR_CONTEXT_ID, @@ -196,7 +196,7 @@ static bool vmci_check_host_caps(struct pci_dev *pdev) __func__, result ? "PASSED" : "FAILED"); /* We need the vector. There are no fallbacks. */ - return result; + return result ? 0 : -ENXIO; } /* @@ -564,12 +564,14 @@ static int vmci_guest_probe_device(struct pci_dev *pdev, dev_warn(&pdev->dev, "VMCI device unable to register notification bitmap with PPN 0x%x\n", (u32) bitmap_ppn); + error = -ENXIO; goto err_remove_vmci_dev_g; } } /* Check host capabilities. */ - if (!vmci_check_host_caps(pdev)) + error = vmci_check_host_caps(pdev); + if (error) goto err_remove_bitmap; /* Enable device. */