[PATCH v1 2/3] mmc: block: Add mmc_bdev_to_card() helper
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2020-02-24 23:22:25
Also in:
linux-mmc, linux-tegra, lkml
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
NVIDIA Tegra Partition Table takes into account MMC card's BOOT_SIZE_MULT parameter, and thus, the partition parser needs to retrieve that EXT_CSD value from the block device. This patch introduces new helper which takes block device for the input argument and returns corresponding MMC card. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/mmc/core/block.c | 14 ++++++++++++++ include/linux/mmc/card.h | 3 +++ 2 files changed, 17 insertions(+)
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 663d87924e5e..5d853450c764 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c@@ -301,6 +301,20 @@ static ssize_t force_ro_store(struct device *dev, struct device_attribute *attr, return ret; } +struct mmc_card *mmc_bdev_to_card(struct block_device *bdev) +{ + struct mmc_blk_data *md; + + if (bdev->bd_disk->major != MMC_BLOCK_MAJOR) + return NULL; + + md = mmc_blk_get(bdev->bd_disk); + if (!md) + return NULL; + + return md->queue.card; +} + static int mmc_blk_open(struct block_device *bdev, fmode_t mode) { struct mmc_blk_data *md = mmc_blk_get(bdev->bd_disk);
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 90b1d83ce675..daccb0cc25f8 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h@@ -7,6 +7,7 @@ #ifndef LINUX_MMC_CARD_H #define LINUX_MMC_CARD_H +#include <linux/blkdev.h> #include <linux/device.h> #include <linux/mod_devicetable.h>
@@ -324,4 +325,6 @@ bool mmc_card_is_blockaddr(struct mmc_card *card); #define mmc_card_sd(c) ((c)->type == MMC_TYPE_SD) #define mmc_card_sdio(c) ((c)->type == MMC_TYPE_SDIO) +struct mmc_card *mmc_bdev_to_card(struct block_device *bdev); + #endif /* LINUX_MMC_CARD_H */
--
2.24.0