linux-kernel - [RFC PATCH v2 5/7] mmc: host: sdhci: Remove redundant sg_count member of struct sdhci

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Date:   Sun, 26 Apr 2020 17:38:58 +0800
From:   Baolin Wang <baolin.wang7@...il.com>
To:     axboe@...nel.dk, ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc:     arnd@...db.de, linus.walleij@...aro.org, paolo.valente@...aro.org,
        ming.lei@...hat.com, orsonzhai@...il.com, zhang.lyra@...il.com,
        baolin.wang7@...il.com, linux-mmc@...r.kernel.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [RFC PATCH v2 5/7] mmc: host: sdhci: Remove redundant sg_count member of struct sdhci_host

The mmc_data structure has a member to save the mapped sg count, so
no need introduce a redundant sg_count of struct sdhci_host, remove it.
This is also a preparation patch to support ADMA3 transfer mode.

Signed-off-by: Baolin Wang <baolin.wang7@...il.com>
---
 drivers/mmc/host/sdhci.c | 12 +++++-------
 drivers/mmc/host/sdhci.h |  2 --
 2 files changed, 5 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 3d4cdf0e0535..ad7e2442f120 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -709,7 +709,7 @@ static void sdhci_adma_mark_end(void *desc)
 }
 
 static void sdhci_adma_table_pre(struct sdhci_host *host,
-	struct mmc_data *data, int sg_count)
+	struct mmc_data *data)
 {
 	struct scatterlist *sg;
 	unsigned long flags;
@@ -723,14 +723,12 @@ static void sdhci_adma_table_pre(struct sdhci_host *host,
 	 * We currently guess that it is LE.
 	 */
 
-	host->sg_count = sg_count;
-
 	desc = host->adma_table;
 	align = host->align_buffer;
 
 	align_addr = host->align_addr;
 
-	for_each_sg(data->sg, sg, host->sg_count, i) {
+	for_each_sg(data->sg, sg, data->sg_count, i) {
 		addr = sg_dma_address(sg);
 		len = sg_dma_len(sg);
 
@@ -802,7 +800,7 @@ static void sdhci_adma_table_post(struct sdhci_host *host,
 		bool has_unaligned = false;
 
 		/* Do a quick scan of the SG list for any unaligned mappings */
-		for_each_sg(data->sg, sg, host->sg_count, i)
+		for_each_sg(data->sg, sg, data->sg_count, i)
 			if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
 				has_unaligned = true;
 				break;
@@ -814,7 +812,7 @@ static void sdhci_adma_table_post(struct sdhci_host *host,
 
 			align = host->align_buffer;
 
-			for_each_sg(data->sg, sg, host->sg_count, i) {
+			for_each_sg(data->sg, sg, data->sg_count, i) {
 				if (sg_dma_address(sg) & SDHCI_ADMA2_MASK) {
 					size = SDHCI_ADMA2_ALIGN -
 					       (sg_dma_address(sg) & SDHCI_ADMA2_MASK);
@@ -1134,7 +1132,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_command *cmd)
 			WARN_ON(1);
 			host->flags &= ~SDHCI_REQ_USE_DMA;
 		} else if (host->flags & SDHCI_USE_ADMA) {
-			sdhci_adma_table_pre(host, data, sg_cnt);
+			sdhci_adma_table_pre(host, data);
 			sdhci_set_adma_addr(host, host->adma_addr);
 		} else {
 			WARN_ON(sg_cnt != 1);
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 5cade9a7b53a..51207072d1ec 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -588,8 +588,6 @@ struct sdhci_host {
 	struct sg_mapping_iter sg_miter;	/* SG state for PIO */
 	unsigned int blocks;	/* remaining PIO blocks */
 
-	int sg_count;		/* Mapped sg entries */
-
 	void *adma_table;	/* ADMA descriptor table */
 	void *align_buffer;	/* Bounce buffer */
 	void *integr_table;	/* ADMA3 intergrate descriptor table */
-- 
2.17.1