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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: 48e3d668b7 ("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>
hifive-unleashed-5.1
Nadav Amit 2018-06-19 16:00:26 -07:00 committed by Greg Kroah-Hartman
parent 5081efd112
commit ce664331b2
1 changed files with 18 additions and 17 deletions
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35
drivers/misc/vmw_balloon.c
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@ -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 ((b->capabilities & VMW_BALLOON_SIGNALLED_WAKEUP_CMD) == 0)
return 0;
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);
}
}
error = vmci_doorbell_create(&b->vmci_doorbell, VMCI_FLAG_DELAYED_CB,
VMCI_PRIVILEGE_FLAG_RESTRICTED,
vmballoon_doorbell, b);
if (error != 0) {
vmballoon_vmci_cleanup(b);
if (error != VMCI_SUCCESS)
goto fail;
return -EIO;
}
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;
}
/*