[PATCH 1/2] x86/sgx: Remove duplicate check for entry->epc_page in sgx_encl_load_page()

[Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>]

The existence of the page is checked first hand for legit race
conditions (either two or more concurrent threads running the #PF
handler or the reclaimer has taken over the page):

/* Page is already resident in the EPC. */
if (entry->epc_page) {
	if (entry->desc & SGX_ENCL_PAGE_RECLAIMED)
		return ERR_PTR(-EBUSY);

	return entry;
}

After that the existence is a checked as a condition for ELDU.

This commit removes the redundant check.

Cc: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
 arch/x86/kernel/cpu/sgx/encl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/sgx/encl.c b/arch/x86/kernel/cpu/sgx/encl.c
index a20d498e9dcd..d6397f7ef3b8 100644
--- a/arch/x86/kernel/cpu/sgx/encl.c
+++ b/arch/x86/kernel/cpu/sgx/encl.c
@@ -123,7 +123,7 @@ static struct sgx_encl_page *sgx_encl_load_page(struct sgx_encl *encl,
 			return ERR_CAST(epc_page);
 	}
 
-	epc_page = entry->epc_page ? entry->epc_page : sgx_encl_eldu(entry);
+	epc_page = sgx_encl_eldu(entry);
 	if (IS_ERR(epc_page))
 		return ERR_CAST(epc_page);
 
-- 
2.20.1