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authorArnd Bergmann <arnd@arndb.de>2021-01-25 14:37:52 +0300
committerJens Wiklander <jens.wiklander@linaro.org>2021-02-08 15:42:31 +0300
commit67bc809752796acb2641ca343cad5b45eef31d7c (patch)
treeb52dc73f429a1ba3c79cc98b10e7f79cc0d3dbd8 /drivers/tee
parente71ba9452f0b5b2e8dc8aa5445198cd9214a6a62 (diff)
downloadlinux-67bc809752796acb2641ca343cad5b45eef31d7c.tar.xz
optee: simplify i2c access
Storing a bogus i2c_client structure on the stack adds overhead and causes a compile-time warning: drivers/tee/optee/rpc.c:493:6: error: stack frame size of 1056 bytes in function 'optee_handle_rpc' [-Werror,-Wframe-larger-than=] void optee_handle_rpc(struct tee_context *ctx, struct optee_rpc_param *param, Change the implementation of handle_rpc_func_cmd_i2c_transfer() to open-code the i2c_transfer() call, which makes it easier to read and avoids the warning. Fixes: c05210ab9757 ("drivers: optee: allow op-tee to access devices on the i2c bus") Tested-by: Jorge Ramirez-Ortiz <jorge@foundries.io> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
Diffstat (limited to 'drivers/tee')
-rw-r--r--drivers/tee/optee/rpc.c31
1 files changed, 16 insertions, 15 deletions
diff --git a/drivers/tee/optee/rpc.c b/drivers/tee/optee/rpc.c
index 1e3614e4798f..6cbb3643c6c4 100644
--- a/drivers/tee/optee/rpc.c
+++ b/drivers/tee/optee/rpc.c
@@ -54,8 +54,9 @@ bad:
static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
struct optee_msg_arg *arg)
{
- struct i2c_client client = { 0 };
struct tee_param *params;
+ struct i2c_adapter *adapter;
+ struct i2c_msg msg = { };
size_t i;
int ret = -EOPNOTSUPP;
u8 attr[] = {
@@ -85,48 +86,48 @@ static void handle_rpc_func_cmd_i2c_transfer(struct tee_context *ctx,
goto bad;
}
- client.adapter = i2c_get_adapter(params[0].u.value.b);
- if (!client.adapter)
+ adapter = i2c_get_adapter(params[0].u.value.b);
+ if (!adapter)
goto bad;
if (params[1].u.value.a & OPTEE_MSG_RPC_CMD_I2C_FLAGS_TEN_BIT) {
- if (!i2c_check_functionality(client.adapter,
+ if (!i2c_check_functionality(adapter,
I2C_FUNC_10BIT_ADDR)) {
- i2c_put_adapter(client.adapter);
+ i2c_put_adapter(adapter);
goto bad;
}
- client.flags = I2C_CLIENT_TEN;
+ msg.flags = I2C_M_TEN;
}
- client.addr = params[0].u.value.c;
- snprintf(client.name, I2C_NAME_SIZE, "i2c%d", client.adapter->nr);
+ msg.addr = params[0].u.value.c;
+ msg.buf = params[2].u.memref.shm->kaddr;
+ msg.len = params[2].u.memref.size;
switch (params[0].u.value.a) {
case OPTEE_MSG_RPC_CMD_I2C_TRANSFER_RD:
- ret = i2c_master_recv(&client, params[2].u.memref.shm->kaddr,
- params[2].u.memref.size);
+ msg.flags |= I2C_M_RD;
break;
case OPTEE_MSG_RPC_CMD_I2C_TRANSFER_WR:
- ret = i2c_master_send(&client, params[2].u.memref.shm->kaddr,
- params[2].u.memref.size);
break;
default:
- i2c_put_adapter(client.adapter);
+ i2c_put_adapter(adapter);
goto bad;
}
+ ret = i2c_transfer(adapter, &msg, 1);
+
if (ret < 0) {
arg->ret = TEEC_ERROR_COMMUNICATION;
} else {
- params[3].u.value.a = ret;
+ params[3].u.value.a = msg.len;
if (optee_to_msg_param(arg->params, arg->num_params, params))
arg->ret = TEEC_ERROR_BAD_PARAMETERS;
else
arg->ret = TEEC_SUCCESS;
}
- i2c_put_adapter(client.adapter);
+ i2c_put_adapter(adapter);
kfree(params);
return;
bad: