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| author | Brian Norris <computersforpeace@gmail.com> | 2015-11-04 04:01:53 +0300 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2015-11-06 20:33:15 +0300 |
| commit | f8479dd6a03cfdc3b14e742045bfd8748cd86bd7 (patch) | |
| tree | ec1e4357aa02de5114a19bfa78d869b72641f091 /drivers/mtd | |
| parent | 28ec8a864f4b67bb801aede7919391531612c7dd (diff) | |
| download | linux-f8479dd6a03cfdc3b14e742045bfd8748cd86bd7.tar.xz | |
mtd: don't WARN about overloaded users of mtd->reboot_notifier.notifier_call
There are multiple types of users of mtd->reboot_notifier.notifier_call:
(1) A while back, the cfi_cmdset_000{1,2} chip drivers implemented a
reboot notifier to (on a best effort basis) attempt to reset their flash
chips before rebooting.
(2) More recently, we implemented a common _reboot() hook so that MTD
drivers (particularly, NAND flash) could better halt I/O operations
without having to reimplement the same notifier boilerplate.
Currently, the WARN_ONCE() condition here was written to handle (2), but
at the same time it mis-diagnosed case (1) as an already-registered MTD.
Let's fix this by having the WARN_ONCE() condition better imitate the
condition that immediately follows it. (Wow, I don't know how I missed
that one.)
(Side note: Unfortunately, we can't yet combine the reboot notifier code
for (1) and (2) with a patch like [1], because some users of (1) also
use mtdconcat, and so the mtd_info struct from cfi_cmdset_000{1,2} won't
actually get registered with mtdcore, and therefore their reboot
notifier won't get registered.)
[1] http://patchwork.ozlabs.org/patch/417981/
Suggested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Jesper Nilsson <jespern@axis.com>
Cc: linux-cris-kernel@axis.com
Tested-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Tested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/mtdcore.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index b1eea48c501d..a91cee90aef9 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -616,7 +616,8 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types, * does cause problems with parse_mtd_partitions() above (e.g., * cmdlineparts will register partitions more than once). */ - WARN_ONCE(mtd->reboot_notifier.notifier_call, "MTD already registered\n"); + WARN_ONCE(mtd->_reboot && mtd->reboot_notifier.notifier_call, + "MTD already registered\n"); if (mtd->_reboot && !mtd->reboot_notifier.notifier_call) { mtd->reboot_notifier.notifier_call = mtd_reboot_notifier; register_reboot_notifier(&mtd->reboot_notifier); |