From 6937c143e3d3dee432b77213ce546128fcb34995 Mon Sep 17 00:00:00 2001 From: Sudeep Holla Date: Mon, 12 Oct 2020 14:26:24 +0100 Subject: [PATCH] firmware: arm_scmi: Add missing Rx size re-initialisation [ Upstream commit 9724722fde8f9bbd2b87340f00b9300c9284001e ] Few commands provide the list of description partially and require to be called consecutively until all the descriptors are fetched completely. In such cases, we don't release the buffers and reuse them for consecutive transmits. However, currently we don't reset the Rx size which will be set as per the response for the last transmit. This may result in incorrect response size being interpretted as the firmware may repond with size greater than the one set but we read only upto the size set by previous response. Let us reset the receive buffer size to max possible in such cases as we don't know the exact size of the response. Link: https://lore.kernel.org/r/20201012141746.32575-1-sudeep.holla@arm.com Fixes: b6f20ff8bd94 ("firmware: arm_scmi: add common infrastructure and support for base protocol") Reported-by: Etienne Carriere Signed-off-by: Sudeep Holla Signed-off-by: Sasha Levin --- drivers/firmware/arm_scmi/base.c | 2 ++ drivers/firmware/arm_scmi/clock.c | 2 ++ drivers/firmware/arm_scmi/common.h | 2 ++ drivers/firmware/arm_scmi/driver.c | 8 ++++++++ drivers/firmware/arm_scmi/perf.c | 2 ++ drivers/firmware/arm_scmi/sensors.c | 2 ++ 6 files changed, 18 insertions(+) diff --git a/drivers/firmware/arm_scmi/base.c b/drivers/firmware/arm_scmi/base.c index f804e8af6521..f986ee8919f0 100644 --- a/drivers/firmware/arm_scmi/base.c +++ b/drivers/firmware/arm_scmi/base.c @@ -173,6 +173,8 @@ static int scmi_base_implementation_list_get(const struct scmi_handle *handle, protocols_imp[tot_num_ret + loop] = *(list + loop); tot_num_ret += loop_num_ret; + + scmi_reset_rx_to_maxsz(handle, t); } while (loop_num_ret); scmi_xfer_put(handle, t); diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c index 32526a793f3a..38400a8d0ca8 100644 --- a/drivers/firmware/arm_scmi/clock.c +++ b/drivers/firmware/arm_scmi/clock.c @@ -177,6 +177,8 @@ scmi_clock_describe_rates_get(const struct scmi_handle *handle, u32 clk_id, } tot_rate_cnt += num_returned; + + scmi_reset_rx_to_maxsz(handle, t); /* * check for both returned and remaining to avoid infinite * loop due to buggy firmware diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h index 5237c2ff79fe..9a680b9af9e5 100644 --- a/drivers/firmware/arm_scmi/common.h +++ b/drivers/firmware/arm_scmi/common.h @@ -103,6 +103,8 @@ int scmi_do_xfer_with_response(const struct scmi_handle *h, struct scmi_xfer *xfer); int scmi_xfer_get_init(const struct scmi_handle *h, u8 msg_id, u8 prot_id, size_t tx_size, size_t rx_size, struct scmi_xfer **p); +void scmi_reset_rx_to_maxsz(const struct scmi_handle *handle, + struct scmi_xfer *xfer); int scmi_handle_put(const struct scmi_handle *handle); struct scmi_handle *scmi_handle_get(struct device *dev); void scmi_set_handle(struct scmi_device *scmi_dev); diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c index 3eb0382491ce..11078199abed 100644 --- a/drivers/firmware/arm_scmi/driver.c +++ b/drivers/firmware/arm_scmi/driver.c @@ -481,6 +481,14 @@ int scmi_do_xfer(const struct scmi_handle *handle, struct scmi_xfer *xfer) return ret; } +void scmi_reset_rx_to_maxsz(const struct scmi_handle *handle, + struct scmi_xfer *xfer) +{ + struct scmi_info *info = handle_to_scmi_info(handle); + + xfer->rx.len = info->desc->max_msg_size; +} + #define SCMI_MAX_RESPONSE_TIMEOUT (2 * MSEC_PER_SEC) /** diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c index 601af4edad5e..129a2887e964 100644 --- a/drivers/firmware/arm_scmi/perf.c +++ b/drivers/firmware/arm_scmi/perf.c @@ -281,6 +281,8 @@ scmi_perf_describe_levels_get(const struct scmi_handle *handle, u32 domain, } tot_opp_cnt += num_returned; + + scmi_reset_rx_to_maxsz(handle, t); /* * check for both returned and remaining to avoid infinite * loop due to buggy firmware diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c index a400ea805fc2..931208bc48f1 100644 --- a/drivers/firmware/arm_scmi/sensors.c +++ b/drivers/firmware/arm_scmi/sensors.c @@ -154,6 +154,8 @@ static int scmi_sensor_description_get(const struct scmi_handle *handle, } desc_index += num_returned; + + scmi_reset_rx_to_maxsz(handle, t); /* * check for both returned and remaining to avoid infinite * loop due to buggy firmware