From 00596576a05145a1b5672897a82ef87af00becf4 Mon Sep 17 00:00:00 2001 From: Zev Weiss Date: Fri, 15 Oct 2021 11:50:48 -0700 Subject: [PATCH] mtd: core: clear out unregistered devices a bit more This allows an MTD device that has been unregistered to be easily re-registered later without triggering spurious "already registered" warnings in mtd_device_parse_register() and add_mtd_device(). Signed-off-by: Zev Weiss Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20211015185049.3318-1-zev@bewilderbeest.net --- drivers/mtd/mtdcore.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index fc0bed1..a7723a70 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -747,6 +747,9 @@ int del_mtd_device(struct mtd_info *mtd) device_unregister(&mtd->dev); + /* Clear dev so mtd can be safely re-registered later if desired */ + memset(&mtd->dev, 0, sizeof(mtd->dev)); + idr_remove(&mtd_idr, mtd->index); of_node_put(mtd_get_of_node(mtd)); @@ -1018,8 +1021,10 @@ int mtd_device_unregister(struct mtd_info *master) { int err; - if (master->_reboot) + if (master->_reboot) { unregister_reboot_notifier(&master->reboot_notifier); + memset(&master->reboot_notifier, 0, sizeof(master->reboot_notifier)); + } if (master->otp_user_nvmem) nvmem_unregister(master->otp_user_nvmem); -- 2.7.4