diff options
| author | Shivamurthy Shastri <shivamurthy.shastri@linutronix.de> | 2023-09-19 14:33:20 +0300 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2023-09-22 17:33:34 +0300 |
| commit | 3cff177fc2793a362d784c912f536e69a755925e (patch) | |
| tree | dccf792a8f7411a389edc549b32fb7452fee4dac /drivers/mtd/chips | |
| parent | 28a05da765c0cd21654ef5fed3b53af5cd278d63 (diff) | |
| download | linux-3cff177fc2793a362d784c912f536e69a755925e.tar.xz | |
mtd: map_ram: prevent use of point and unpoint when NO_XIP is set
When the DT property no-unaligned-direct-access is set, map->phys is set
to NO_XIP. With this property set, the flash should not be exposed
directly to MTD users, since it cannot be mapped.
map_ram() exposes the flash direct access unconditionally which leads to
access errors (when the bus width does not match the RAM width).
Therefore do not set point and unpoint when NO_XIP is set.
Signed-off-by: Shivamurthy Shastri <shivamurthy.shastri@linutronix.de>
Reviewed-by: Benedikt Spranger <b.spranger@linutronix.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230919113320.16953-1-shivamurthy.shastri@linutronix.de
Diffstat (limited to 'drivers/mtd/chips')
| -rw-r--r-- | drivers/mtd/chips/map_ram.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/mtd/chips/map_ram.c b/drivers/mtd/chips/map_ram.c index e8dd6496927e..f9d3e32ef8e9 100644 --- a/drivers/mtd/chips/map_ram.c +++ b/drivers/mtd/chips/map_ram.c @@ -70,12 +70,16 @@ static struct mtd_info *map_ram_probe(struct map_info *map) mtd->_read = mapram_read; mtd->_write = mapram_write; mtd->_panic_write = mapram_write; - mtd->_point = mapram_point; mtd->_sync = mapram_nop; - mtd->_unpoint = mapram_unpoint; mtd->flags = MTD_CAP_RAM; mtd->writesize = 1; + /* Disable direct access when NO_XIP is set */ + if (map->phys != NO_XIP) { + mtd->_point = mapram_point; + mtd->_unpoint = mapram_unpoint; + } + mtd->erasesize = PAGE_SIZE; while(mtd->size & (mtd->erasesize - 1)) mtd->erasesize >>= 1; |