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restorable: Ensure the given image is not nil at makeStaleIfDependingOn

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This commit is contained in:
Hajime Hoshi 2018-03-24 21:57:06 +09:00
parent b15fb523a8
commit 1616373819
1 changed files with 3 additions and 5 deletions
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8
internal/restorable/images.go
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@ -105,13 +105,11 @@ func (i *images) resolveStaleImages() error {
// When target is changed, all images depending on target can't be restored with target.
// makeStaleIfDependingOn is called in such situation.
func (i *images) makeStaleIfDependingOn(target *Image) {
if target == nil {
panic("not reached")
}
// Avoid defer for performance
i.m.Lock()
if target == nil {
// disposed
i.m.Unlock()
return
}
if i.lastTarget == target {
i.m.Unlock()
return