Re: [PATCH -next] mm/hmm/test: fix missing unlock on error in dmirror_migrate_finalize_and_map()

[Ralph Campbell <rcampbell@nvidia.com>]

On 5/8/20 8:02 PM, Wei Yongjun wrote:
> Add the missing unlock before return from function
> dmirror_migrate_finalize_and_map() in the error
> handling case.
> 
> Fixes: 5d5e54be8a1e ("mm/hmm/test: add selftest driver for HMM")
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>

Looks good, thanks!
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>

> ---
>   lib/test_hmm.c | 4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/test_hmm.c b/lib/test_hmm.c
> index 00bca6116f93..30462193c4ff 100644
> --- a/lib/test_hmm.c
> +++ b/lib/test_hmm.c
> @@ -647,8 +647,10 @@ static int dmirror_migrate_finalize_and_map(struct migrate_vma *args,
>   		if (*dst & MIGRATE_PFN_WRITE)
>   			entry = xa_tag_pointer(entry, DPT_XA_TAG_WRITE);
>   		entry = xa_store(&dmirror->pt, pfn, entry, GFP_ATOMIC);
> -		if (xa_is_err(entry))
> +		if (xa_is_err(entry)) {
> +			mutex_unlock(&dmirror->mutex);
>   			return xa_err(entry);
> +		}
>   	}
>   
>   	mutex_unlock(&dmirror->mutex);
> 
> 
> 
>