Merge tag 'scmi-fixes-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes

Arm SCMI firmware interface fixes for v5.18

Few fixes to address assorted set of issues:
- Erroneous clearing of Tx channel which only platform firmware must do
- Invalid point access pass as parameter to sort() in clock support
- Sparse build warnings in OPTEE transport driver
- Use of deprecated zero-length arrays

* tag 'scmi-fixes-5.18' of git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
  firmware: arm_scmi: Fix sparse warnings in OPTEE transport driver
  firmware: arm_scmi: Replace zero-length array with flexible-array member
  firmware: arm_scmi: Fix sorting of retrieved clock rates
  firmware: arm_scmi: Remove clear channel call on the TX channel

Link: https://lore.kernel.org/r/20220407110818.1436181-1-sudeep.holla@arm.com
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

Author: arndb

drivers/firmware/arm_scmi/clock.c

@@ -49,7 +49,7 @@ struct scmi_msg_resp_clock_describe_rates {
 	struct {
 		__le32 value_low;
 		__le32 value_high;
-	} rate[0];
+	} rate[];
 #define RATE_TO_U64(X)		\
 ({				\
 	typeof(X) x = (X);	\
@@ -210,7 +210,8 @@ scmi_clock_describe_rates_get(const struct scmi_protocol_handle *ph, u32 clk_id,
 
 	if (rate_discrete && rate) {
 		clk->list.num_rates = tot_rate_cnt;
-		sort(rate, tot_rate_cnt, sizeof(*rate), rate_cmp_func, NULL);
+		sort(clk->list.rates, tot_rate_cnt, sizeof(*rate),
+		     rate_cmp_func, NULL);
 	}
 
 	clk->rate_discrete = rate_discrete;

drivers/firmware/arm_scmi/driver.c

@@ -679,7 +679,8 @@ static void scmi_handle_response(struct scmi_chan_info *cinfo,
 
 	xfer = scmi_xfer_command_acquire(cinfo, msg_hdr);
 	if (IS_ERR(xfer)) {
-		scmi_clear_channel(info, cinfo);
+		if (MSG_XTRACT_TYPE(msg_hdr) == MSG_TYPE_DELAYED_RESP)
+			scmi_clear_channel(info, cinfo);
 		return;
 	}
 

drivers/firmware/arm_scmi/optee.c

@@ -405,8 +405,8 @@ static int scmi_optee_chan_free(int id, void *p, void *data)
 	return 0;
 }
 
-static struct scmi_shared_mem *get_channel_shm(struct scmi_optee_channel *chan,
-					       struct scmi_xfer *xfer)
+static struct scmi_shared_mem __iomem *
+get_channel_shm(struct scmi_optee_channel *chan, struct scmi_xfer *xfer)
 {
 	if (!chan)
 		return NULL;
@@ -419,7 +419,7 @@ static int scmi_optee_send_message(struct scmi_chan_info *cinfo,
 				   struct scmi_xfer *xfer)
 {
 	struct scmi_optee_channel *channel = cinfo->transport_info;
-	struct scmi_shared_mem *shmem = get_channel_shm(channel, xfer);
+	struct scmi_shared_mem __iomem *shmem = get_channel_shm(channel, xfer);
 	int ret;
 
 	mutex_lock(&channel->mu);
@@ -436,7 +436,7 @@ static void scmi_optee_fetch_response(struct scmi_chan_info *cinfo,
 				      struct scmi_xfer *xfer)
 {
 	struct scmi_optee_channel *channel = cinfo->transport_info;
-	struct scmi_shared_mem *shmem = get_channel_shm(channel, xfer);
+	struct scmi_shared_mem __iomem *shmem = get_channel_shm(channel, xfer);
 
 	shmem_fetch_response(shmem, xfer);
 }