[PATCH v4 2/3] mmc: block: Add mmc_bdev_to_card() helper
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-08-17 01:37:06
Also in:
linux-block, linux-efi
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
Add mmc_bdev_to_card() helper which is needed for checking EMMC parameters by partition table parser in order to find EFI entry on NVIDIA Tegra devices. Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- drivers/mmc/core/block.c | 15 +++++++++++++++ include/linux/mmc/blkdev.h | 13 +++++++++++++ 2 files changed, 28 insertions(+) create mode 100644 include/linux/mmc/blkdev.h
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 672cc505ce37..7e9a486073fd 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c@@ -42,6 +42,7 @@ #include <linux/debugfs.h> #include <linux/mmc/ioctl.h> +#include <linux/mmc/blkdev.h> #include <linux/mmc/card.h> #include <linux/mmc/host.h> #include <linux/mmc/mmc.h>
@@ -357,6 +358,20 @@ static const struct attribute_group *mmc_disk_attr_groups[] = { NULL, }; +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/blkdev.h b/include/linux/mmc/blkdev.h
new file mode 100644
index 000000000000..67608c58de70
--- /dev/null
+++ b/include/linux/mmc/blkdev.h@@ -0,0 +1,13 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/include/linux/mmc/blkdev.h + */ +#ifndef LINUX_MMC_BLOCK_DEVICE_H +#define LINUX_MMC_BLOCK_DEVICE_H + +struct block_device; +struct mmc_card; + +struct mmc_card *mmc_bdev_to_card(struct block_device *bdev); + +#endif /* LINUX_MMC_BLOCK_DEVICE_H */
--
2.32.0