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| author | Javier Martinez Canillas <javier.martinez@collabora.co.uk> | 2015-02-02 12:26:22 +0100 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2015-02-27 00:44:52 +0100 |
| commit | 1b84f2a4cd4a6f517a313261f6f7c8caae5696c6 (patch) | |
| tree | 8e7b0f5a1477c8792a83c7de0b03b8dc0ad737a1 /drivers/mfd | |
| parent | Linux 4.0-rc1 (diff) | |
| download | linux-1b84f2a4cd4a6f517a313261f6f7c8caae5696c6.tar.xz linux-1b84f2a4cd4a6f517a313261f6f7c8caae5696c6.zip | |
mfd: cros_ec: Use fixed size arrays to transfer data with the EC
The struct cros_ec_command will be used as an ioctl() argument for the
API to control the ChromeOS EC from user-space. So the data structure
has to be 64-bit safe to make it compatible between 32 and 64 avoiding
the need for a compat ioctl interface. Since pointers are self-aligned
to different byte boundaries, use fixed size arrays instead of pointers
for transferring ingoing and outgoing data with the Embedded Controller.
Also, re-arrange struct members by decreasing alignment requirements to
reduce the needing padding size.
Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Acked-by: Lee Jones <lee.jones@linaro.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Olof Johansson <olof@lixom.net>
Diffstat (limited to 'drivers/mfd')
| -rw-r--r-- | drivers/mfd/cros_ec.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/mfd/cros_ec.c b/drivers/mfd/cros_ec.c index fc0c81ef04ff..c872e1b0eaf8 100644 --- a/drivers/mfd/cros_ec.c +++ b/drivers/mfd/cros_ec.c @@ -74,15 +74,11 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, ret = ec_dev->cmd_xfer(ec_dev, msg); if (msg->result == EC_RES_IN_PROGRESS) { int i; - struct cros_ec_command status_msg; - struct ec_response_get_comms_status status; + struct cros_ec_command status_msg = { }; + struct ec_response_get_comms_status *status; - status_msg.version = 0; status_msg.command = EC_CMD_GET_COMMS_STATUS; - status_msg.outdata = NULL; - status_msg.outsize = 0; - status_msg.indata = (uint8_t *)&status; - status_msg.insize = sizeof(status); + status_msg.insize = sizeof(*status); /* * Query the EC's status until it's no longer busy or @@ -98,7 +94,10 @@ int cros_ec_cmd_xfer(struct cros_ec_device *ec_dev, msg->result = status_msg.result; if (status_msg.result != EC_RES_SUCCESS) break; - if (!(status.flags & EC_COMMS_STATUS_PROCESSING)) + + status = (struct ec_response_get_comms_status *) + status_msg.indata; + if (!(status->flags & EC_COMMS_STATUS_PROCESSING)) break; } } |