mmc: initialize struct mmc_data at declaration time

Converts from:
	struct mmc_data data;
	memset(&data, 0, sizeof(struct mmc_data));

to:
	struct mmc_data data = {0};

because it's shorter, as performant, and easier to work out whether
initialization has happened.
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/card/block.c

@@ -261,7 +261,7 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 	unsigned int timeout_us;
 
 	struct scatterlist sg;
@@ -282,8 +282,6 @@ static u32 mmc_sd_num_wr_blocks(struct mmc_card *card)
 	cmd.arg = 0;
 	cmd.flags = MMC_RSP_SPI_R1 | MMC_RSP_R1 | MMC_CMD_ADTC;
 
-	memset(&data, 0, sizeof(struct mmc_data));
-
 	data.timeout_ns = card->csd.tacc_ns * 100;
 	data.timeout_clks = card->csd.tacc_clks * 100;
 

drivers/mmc/card/mmc_test.c

@@ -249,12 +249,11 @@ static int mmc_test_buffer_transfer(struct mmc_test_card *test,
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
 	struct mmc_command stop = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 
 	struct scatterlist sg;
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
-	memset(&data, 0, sizeof(struct mmc_data));
 
 	mrq.cmd = &cmd;
 	mrq.data = &data;
@@ -732,10 +731,9 @@ static int mmc_test_simple_transfer(struct mmc_test_card *test,
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
 	struct mmc_command stop = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
-	memset(&data, 0, sizeof(struct mmc_data));
 
 	mrq.cmd = &cmd;
 	mrq.data = &data;
@@ -760,12 +758,11 @@ static int mmc_test_broken_transfer(struct mmc_test_card *test,
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
 	struct mmc_command stop = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 
 	struct scatterlist sg;
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
-	memset(&data, 0, sizeof(struct mmc_data));
 
 	mrq.cmd = &cmd;
 	mrq.data = &data;

drivers/mmc/core/mmc_ops.c

@@ -235,7 +235,7 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 {
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 	struct scatterlist sg;
 	void *data_buf;
 
@@ -247,7 +247,6 @@ mmc_send_cxd_data(struct mmc_card *card, struct mmc_host *host,
 		return -ENOMEM;
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
-	memset(&data, 0, sizeof(struct mmc_data));
 
 	mrq.cmd = &cmd;
 	mrq.data = &data;
@@ -459,7 +458,7 @@ mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
 {
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 	struct scatterlist sg;
 	u8 *data_buf;
 	u8 *test_buf;
@@ -489,7 +488,6 @@ mmc_send_bus_test(struct mmc_card *card, struct mmc_host *host, u8 opcode,
 		memcpy(data_buf, test_buf, len);
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
-	memset(&data, 0, sizeof(struct mmc_data));
 
 	mrq.cmd = &cmd;
 	mrq.data = &data;

drivers/mmc/core/sd_ops.c

@@ -245,7 +245,7 @@ int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 	int err;
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 	struct scatterlist sg;
 	void *data_buf;
 
@@ -267,7 +267,6 @@ int mmc_app_send_scr(struct mmc_card *card, u32 *scr)
 		return -ENOMEM;
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
-	memset(&data, 0, sizeof(struct mmc_data));
 
 	mrq.cmd = &cmd;
 	mrq.data = &data;
@@ -307,7 +306,7 @@ int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 {
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 	struct scatterlist sg;
 
 	BUG_ON(!card);
@@ -319,7 +318,6 @@ int mmc_sd_switch(struct mmc_card *card, int mode, int group,
 	value &= 0xF;
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
-	memset(&data, 0, sizeof(struct mmc_data));
 
 	mrq.cmd = &cmd;
 	mrq.data = &data;
@@ -355,7 +353,7 @@ int mmc_app_sd_status(struct mmc_card *card, void *ssr)
 	int err;
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 	struct scatterlist sg;
 
 	BUG_ON(!card);
@@ -369,7 +367,6 @@ int mmc_app_sd_status(struct mmc_card *card, void *ssr)
 		return err;
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
-	memset(&data, 0, sizeof(struct mmc_data));
 
 	mrq.cmd = &cmd;
 	mrq.data = &data;

drivers/mmc/core/sdio_ops.c

@@ -123,7 +123,7 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
 {
 	struct mmc_request mrq;
 	struct mmc_command cmd = {0};
-	struct mmc_data data;
+	struct mmc_data data = {0};
 	struct scatterlist sg;
 
 	BUG_ON(!card);
@@ -137,7 +137,6 @@ int mmc_io_rw_extended(struct mmc_card *card, int write, unsigned fn,
 		return -EINVAL;
 
 	memset(&mrq, 0, sizeof(struct mmc_request));
-	memset(&data, 0, sizeof(struct mmc_data));
 
 	mrq.cmd = &cmd;
 	mrq.data = &data;