spi_flash_mtd_register() can be called several times and each time it will register the same mtd_info instance like if it was a new one. The MTD ID allocation gets crazy when that happens, so let's track the status of the sf_mtd_info object to avoid that.
Fixes: 9fe6d8716e09 ("mtd, spi: Add MTD layer driver") Signed-off-by: Boris Brezillon boris.brezillon@bootlin.com --- drivers/mtd/spi/sf_mtd.c | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/mtd/spi/sf_mtd.c b/drivers/mtd/spi/sf_mtd.c index 58d7e4439903..aabbc3589435 100644 --- a/drivers/mtd/spi/sf_mtd.c +++ b/drivers/mtd/spi/sf_mtd.c @@ -10,6 +10,7 @@ #include <spi_flash.h>
static struct mtd_info sf_mtd_info; +static bool sf_mtd_registered; static char sf_mtd_name[8];
static int spi_flash_mtd_erase(struct mtd_info *mtd, struct erase_info *instr) @@ -73,6 +74,12 @@ static int spi_flash_mtd_number(void)
int spi_flash_mtd_register(struct spi_flash *flash) { + int ret; + + if (sf_mtd_registered) + del_mtd_device(&sf_mtd_info); + + sf_mtd_registered = false; memset(&sf_mtd_info, 0, sizeof(sf_mtd_info)); sprintf(sf_mtd_name, "nor%d", spi_flash_mtd_number());
@@ -94,7 +101,11 @@ int spi_flash_mtd_register(struct spi_flash *flash) sf_mtd_info.numeraseregions = 0; sf_mtd_info.erasesize = flash->sector_size;
- return add_mtd_device(&sf_mtd_info); + ret = add_mtd_device(&sf_mtd_info); + if (!ret) + sf_mtd_registered = true; + + return ret; }
void spi_flash_mtd_unregister(void)