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

[Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>]

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>

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@xxxxxxxx>
---
I wonder whether this patch wants backporting to the old versions
since OPTEE support went in.
---
 xen/arch/arm/tee/optee.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/arm/tee/optee.c b/xen/arch/arm/tee/optee.c
index 3453615..6df0d44 100644
--- 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 ) {
-- 
2.7.4