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| author | Nadav Amit <namit@vmware.com> | 2018-06-19 16:00:26 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-07-03 12:56:30 +0200 |
| commit | ce664331b2487a5d244a51cbdd8cb54f866fbe5d (patch) | |
| tree | ff00794a33269ddb822e574d265e6277a7a29b19 /drivers/misc/vmw_balloon.c | |
| parent | 5081efd112560d3febb328e627176235b250d59d (diff) | |
| download | linux-stable-ce664331b2487a5d244a51cbdd8cb54f866fbe5d.tar.gz linux-stable-ce664331b2487a5d244a51cbdd8cb54f866fbe5d.tar.bz2 linux-stable-ce664331b2487a5d244a51cbdd8cb54f866fbe5d.zip | |
vmw_balloon: VMCI_DOORBELL_SET does not check status
When vmballoon_vmci_init() sets a doorbell using VMCI_DOORBELL_SET, for
some reason it does not consider the status and looks at the result.
However, the hypervisor does not update the result - it updates the
status. This might cause VMCI doorbell not to be enabled, resulting in
degraded performance.
Fixes: 48e3d668b790 ("VMware balloon: Enable notification via VMCI")
Cc: stable@vger.kernel.org
Reviewed-by: Xavier Deguillard <xdeguillard@vmware.com>
Signed-off-by: Nadav Amit <namit@vmware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/vmw_balloon.c')
| -rw-r--r-- | drivers/misc/vmw_balloon.c | 37 |
1 files changed, 19 insertions, 18 deletions
diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index 60ab83d3d0ef..a7df4c24a28d 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -1036,29 +1036,30 @@ static void vmballoon_vmci_cleanup(struct vmballoon *b) */ static int vmballoon_vmci_init(struct vmballoon *b) { - int error = 0; + unsigned long error, dummy; - if ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) != 0) { - error = vmci_doorbell_create(&b->vmci_doorbell, - VMCI_FLAG_DELAYED_CB, - VMCI_PRIVILEGE_FLAG_RESTRICTED, - vmballoon_doorbell, b); - - if (error == VMCI_SUCCESS) { - VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET, - b->vmci_doorbell.context, - b->vmci_doorbell.resource, error); - STATS_INC(b->stats.doorbell_set); - } - } + if ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) == 0) + return 0; - if (error != 0) { - vmballoon_vmci_cleanup(b); + error = vmci_doorbell_create(&b->vmci_doorbell, VMCI_FLAG_DELAYED_CB, + VMCI_PRIVILEGE_FLAG_RESTRICTED, + vmballoon_doorbell, b); - return -EIO; - } + if (error != VMCI_SUCCESS) + goto fail; + + error = VMWARE_BALLOON_CMD(VMCI_DOORBELL_SET, b->vmci_doorbell.context, + b->vmci_doorbell.resource, dummy); + + STATS_INC(b->stats.doorbell_set); + + if (error != VMW_BALLOON_SUCCESS) + goto fail; return 0; +fail: + vmballoon_vmci_cleanup(b); + return -EIO; } /* |