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From 1186af457cc186c5ed01708da71b1ffbdf0a2638 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl>
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Date: Tue, 20 Nov 2018 09:55:45 +0100
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Subject: [PATCH] mtd: keep original flags for every struct mtd_info
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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When allocating a new partition mtd subsystem runs internal tests in the
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allocate_partition(). They may result in modifying specified flags (e.g.
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dropping some /features/ like write access).
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Those constraints don't have to be necessary true for subpartitions. It
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may happen parent partition isn't block aligned (effectively disabling
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write access) while subpartition may fit blocks nicely. In such case all
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checks should be run again (starting with original flags value).
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Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
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Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
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---
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drivers/mtd/mtdcore.c | 2 ++
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drivers/mtd/mtdpart.c | 3 ++-
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include/linux/mtd/mtd.h | 1 +
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3 files changed, 5 insertions(+), 1 deletion(-)
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--- a/drivers/mtd/mtdcore.c
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+++ b/drivers/mtd/mtdcore.c
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@@ -665,6 +665,8 @@ static void mtd_set_dev_defaults(struct
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} else {
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pr_debug("mtd device won't show a device symlink in sysfs\n");
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}
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+
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+ mtd->orig_flags = mtd->flags;
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}
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/**
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--- a/drivers/mtd/mtdpart.c
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+++ b/drivers/mtd/mtdpart.c
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@@ -346,7 +346,8 @@ static struct mtd_part *allocate_partiti
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/* set up the MTD object for this partition */
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slave->mtd.type = parent->type;
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- slave->mtd.flags = parent->flags & ~part->mask_flags;
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+ slave->mtd.flags = parent->orig_flags & ~part->mask_flags;
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+ slave->mtd.orig_flags = slave->mtd.flags;
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slave->mtd.size = part->size;
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slave->mtd.writesize = parent->writesize;
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slave->mtd.writebufsize = parent->writebufsize;
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--- a/include/linux/mtd/mtd.h
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+++ b/include/linux/mtd/mtd.h
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@@ -207,6 +207,7 @@ struct mtd_debug_info {
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struct mtd_info {
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u_char type;
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uint32_t flags;
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+ uint32_t orig_flags; /* Flags as before running mtd checks */
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uint64_t size; // Total size of the MTD
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/* "Major" erase size for the device. Naïve users may take this
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