Since the device file stays open up until all VMAs have been closed we do not need to increase encl->refcount for VMAs. sgx_open() will increase it once and sgx_release() will decrease at a point where the device file is not mapped. anymore. Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx> --- Based on the commentary from Andy and Cedric. arch/x86/kernel/cpu/sgx/driver/main.c | 2 -- arch/x86/kernel/cpu/sgx/encl.c | 3 --- 2 files changed, 5 deletions(-) diff --git a/arch/x86/kernel/cpu/sgx/driver/main.c b/arch/x86/kernel/cpu/sgx/driver/main.c index 87735ce8b5ba..0c831ee5e2de 100644 --- a/arch/x86/kernel/cpu/sgx/driver/main.c +++ b/arch/x86/kernel/cpu/sgx/driver/main.c @@ -68,8 +68,6 @@ static int sgx_mmap(struct file *file, struct vm_area_struct *vma) vma->vm_flags |= VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP | VM_IO; vma->vm_private_data = encl; - kref_get(&encl->refcount); - return 0; } diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c index 6b190eccd02e..9566eb72d417 100644 --- a/arch/x86/kernel/cpu/sgx/encl.c +++ b/arch/x86/kernel/cpu/sgx/encl.c @@ -208,7 +208,6 @@ static void sgx_vma_open(struct vm_area_struct *vma) goto error; } - kref_get(&encl->refcount); return; error: @@ -230,8 +229,6 @@ static void sgx_vma_close(struct vm_area_struct *vma) /* Release kref for the VMA. */ kref_put(&encl_mm->refcount, sgx_encl_mm_release); } - - kref_put(&encl->refcount, sgx_encl_release); } static unsigned int sgx_vma_fault(struct vm_fault *vmf) -- 2.20.1
