xen/arm: optee: Fix arm_smccc_smc's a0 for OPTEE_SMC_DISABLE_SHM_CACHE

Fix a possible copy-paste error in arm_smccc_smc's first argument (a0)
for OPTEE_SMC_DISABLE_SHM_CACHE case.

This error causes Linux > v5.14-rc5 (b5c10dd04b7418793517e3286cde5c04759a86de
optee: Clear stale cache entries during initialization) to stuck
repeatedly issuing OPTEE_SMC_DISABLE_SHM_CACHE call and waiting for
the result to be OPTEE_SMC_RETURN_ENOTAVAIL which will never happen.

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Reviewed-by: Volodymyr Babchuk <volodymyr_babchuk@epam.com>
Acked-by: Stefano Stabellini <sstabellini@kernel.org>
Fixes: 2e35cdf9b2ca ("xen/arm: optee: add OP-TEE mediator skeleton")
Backport: 4.13+

diff --git a/xen/arch/arm/tee/optee.c b/xen/arch/arm/tee/optee.c
index 345361566e5367dccfa2b43b2ce6eecc08f21acc..6df0d44eb9172b31d637db9c6c94adc02d55737f 100644 (file)
--- a/xen/arch/arm/tee/optee.c
+++ b/xen/arch/arm/tee/optee.c
@@ -1692,7 +1692,7 @@ static bool optee_handle_call(struct cpu_user_regs *regs)
         return true;
 
     case OPTEE_SMC_DISABLE_SHM_CACHE:
-        arm_smccc_smc(OPTEE_SMC_ENABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
+        arm_smccc_smc(OPTEE_SMC_DISABLE_SHM_CACHE, 0, 0, 0, 0, 0, 0,
                       OPTEE_CLIENT_ID(current->domain), &resp);
         set_user_reg(regs, 0, resp.a0);
         if ( resp.a0 == OPTEE_SMC_RETURN_OK ) {