Hello Boris,
Am 19.11.2018 um 21:59 schrieb Boris Brezillon:
SPI flash based MTD devs can be registered/unregistered at any time
through the sf probe command or the spi_flash_free() function.
This commit does not try to fix the root cause as it would probably
require rewriting most of the code and have an mtd_info object
instance per spi_flash object (not to mention that the the spi-flash
layer is likely to be replaced by a spi-nor layer ported from Linux).
Instead, we try to be as safe as can be by checking the code returned
by del_mtd_device() and complain loudly when there's nothing we can
do about the deregistration failure. When that happens we also reset
sf_mtd_info.priv to NULL, and check for NULL pointer in the mtd hooks
so that -ENODEV is returned instead of hitting a NULL pointer
dereference exception when the MTD instance is later accessed by a user.
Signed-off-by: Boris Brezillon <boris.brezil...@bootlin.com>
---
Changes in v3:
- New patch
---
drivers/mtd/spi/sf_mtd.c | 39 ++++++++++++++++++++++++++++++++++++---
1 file changed, 36 insertions(+), 3 deletions(-)
Tested-by: Heiko Schocher <h...@denx.de>
bye,
Heiko
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