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| author | Gwendal Grignou <gwendal@chromium.org> | 2017-02-14 20:58:01 +0100 |
|---|---|---|
| committer | Benson Leung <bleung@chromium.org> | 2017-06-27 08:22:39 -0700 |
| commit | d4da97e59e1004aa1a15dd75469def20cd84ab99 (patch) | |
| tree | 7aac14a0e6eb45f8d0db5e65db435d80e6483929 /drivers | |
| parent | a27b8f31cb7929bfb8dc6ca3e6b7a0a39609d7f3 (diff) | |
| download | linux-d4da97e59e1004aa1a15dd75469def20cd84ab99.tar.bz2 | |
cros_ec: Fix deadlock when EC is not responsive at probe
When the EC is not responsive at probe, we try to get basic information
(protocol to use) later on through cros_xfer_cmd() call.
This patch makes sure there is no deadlock when re-probing the EC by
replacing call to cros_xfer_cmd() with send_command() in the function
cros_ec_get_host_command_version_mask(). Also, this patch adds the
function header indicating it must be called protected.
Signed-off-by: Gwendal Grignou <gwendal@chromium.org>
Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
Signed-off-by: Benson Leung <bleung@chromium.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/platform/chrome/cros_ec_proto.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/platform/chrome/cros_ec_proto.c b/drivers/platform/chrome/cros_ec_proto.c index 8f57500d2b78..d6942a67a182 100644 --- a/drivers/platform/chrome/cros_ec_proto.c +++ b/drivers/platform/chrome/cros_ec_proto.c @@ -235,6 +235,22 @@ static int cros_ec_host_command_proto_query_v2(struct cros_ec_device *ec_dev) return ret; } +/* + * cros_ec_get_host_command_version_mask + * + * Get the version mask of a given command. + * + * @ec_dev: EC device to call + * @msg: message structure to use + * @cmd: command to get the version of. + * @mask: result when function returns 0. + * + * @return 0 on success, error code otherwise + * + * LOCKING: + * the caller has ec_dev->lock mutex or the caller knows there is + * no other command in progress. + */ static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev, u16 cmd, u32 *mask) { @@ -256,7 +272,7 @@ static int cros_ec_get_host_command_version_mask(struct cros_ec_device *ec_dev, pver = (struct ec_params_get_cmd_versions *)msg->data; pver->cmd = cmd; - ret = cros_ec_cmd_xfer(ec_dev, msg); + ret = send_command(ec_dev, msg); if (ret > 0) { rver = (struct ec_response_get_cmd_versions *)msg->data; *mask = rver->version_mask; |