[PATCH 11/15] nand: Add function to unregister NAND devices

Sean Anderson
2023-10-29T03:51:13Z

This performs the opposite of nand_register, allowing drivers to unregister
nand devices. This is probably unnecessary for most regular drivers, but we
expect sandbox drivers to get repeatedly bound/unbound, so this will help
avoid dangling pointers.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
---

drivers/mtd/nand/raw/nand.c | 17 +++++++++++++++++
include/nand.h | 1 +
2 files changed, 18 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand.c b/drivers/mtd/nand/raw/nand.c
index 3abd82068fb..80017b3dddd 100644
--- a/drivers/mtd/nand/raw/nand.c
+++ b/drivers/mtd/nand/raw/nand.c
@@ -74,6 +74,23 @@ int nand_register(int devnum, struct mtd_info *mtd)
return 0;
}

+void nand_unregister(struct mtd_info *mtd)
+{
+ int devnum = nand_mtd_to_devnum(mtd);
+
+ if (devnum < 0)
+ return;
+
+ if (nand_curr_device == devnum)
+ nand_curr_device = -1;
+
+ total_nand_size -= mtd->size / 1024;
+
+ del_mtd_device(nand_info[devnum]);
+
+ nand_info[devnum] = NULL;
+}
+
#if !CONFIG_IS_ENABLED(SYS_NAND_SELF_INIT)
static void nand_init_chip(int i)
{
diff --git a/include/nand.h b/include/nand.h
index c1d7533aaac..fc584f5ef7a 100644
--- a/include/nand.h
+++ b/include/nand.h
@@ -22,6 +22,7 @@ int nand_mtd_to_devnum(struct mtd_info *mtd);
#if CONFIG_IS_ENABLED(SYS_NAND_SELF_INIT)
void board_nand_init(void);
int nand_register(int devnum, struct mtd_info *mtd);
+void nand_unregister(struct mtd_info *mtd);
#else
struct nand_chip;

--
2.37.1