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hv: hypercall: VM management fix "Procedure has more than one exit point"

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IEC 61508,ISO 26262 standards highly recommend single-exit rule.

Reduce the count of the "return entries".
Fix the violations which is comply with the cases list below:
1.Function has 2 return entries.
2.The first return entry is used to return the error code of
checking variable whether is valid.

Fix the violations in "if else" format.
V1->V2:
    update the git comment to describe why comply with the
single-exit rule.

V2->V3:
    update the git comment title to give a scope declaration of this
patch.

Tracked-On: #861
Signed-off-by: Huihuang Shi <huihuang.shi@intel.com>
Reviewed-by: Li, Fei1 <fei1.li@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Huihuang Shi 2018-11-26 13:48:38 +08:00 committed by lijinxia
parent a7398e8a2f
commit 9f13a51e8a
1 changed files with 16 additions and 12 deletions
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28
hypervisor/common/hypercall.c
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@ -157,10 +157,11 @@ int32_t hcall_destroy_vm(uint16_t vmid)
struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
if (target_vm == NULL) {
return -1;
ret = -1;
} else {
ret = shutdown_vm(target_vm);
}
ret = shutdown_vm(target_vm);
return ret;
}
@ -181,9 +182,8 @@ int32_t hcall_start_vm(uint16_t vmid)
struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
if (target_vm == NULL) {
return -1;
}
if (target_vm->sw.io_shared_page == NULL) {
ret = -1;
} else if (target_vm->sw.io_shared_page == NULL) {
ret = -1;
} else {
ret = start_vm(target_vm);
@ -206,14 +206,16 @@ int32_t hcall_start_vm(uint16_t vmid)
int32_t hcall_pause_vm(uint16_t vmid)
{
struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
int32_t ret;
if (target_vm == NULL) {
return -1;
ret = -1;
} else {
pause_vm(target_vm);
ret = 0;
}
pause_vm(target_vm);
return 0;
return ret;
}
/**
@ -273,12 +275,14 @@ int32_t hcall_create_vcpu(struct acrn_vm *vm, uint16_t vmid, uint64_t param)
int32_t hcall_reset_vm(uint16_t vmid)
{
struct acrn_vm *target_vm = get_vm_from_vmid(vmid);
int32_t ret;
if ((target_vm == NULL) || is_vm0(target_vm)) {
return -1;
ret = -1;
} else {
ret = reset_vm(target_vm);
}
return reset_vm(target_vm);
return ret;
}
/**