From: Andy Whitcroft Date: Tue, 11 Oct 2016 14:16:57 +0000 (+0100) Subject: dm raid: fix compat_features validation X-Git-Tag: v4.9-rc3~22^2~6 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=5c33677c87cbe44ae04df69c4a29c1750a9ec4e5;p=linux.git dm raid: fix compat_features validation In ecbfb9f118bce4 ("dm raid: add raid level takeover support") a new compatible feature flag was added. Validation for these compat_features was added but this only passes for new raid mappings with this feature flag. This causes previously created raid mappings to be failed at import. Check compat_features for the only valid combination. Fixes: ecbfb9f118bce4 ("dm raid: add raid level takeover support") Cc: stable@vger.kernel.org # v4.8 Signed-off-by: Andy Whitcroft Signed-off-by: Heinz Mauelshagen Signed-off-by: Mike Snitzer --- diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c index 8abde6b8cedc..2a3970097991 100644 --- a/drivers/md/dm-raid.c +++ b/drivers/md/dm-raid.c @@ -2258,7 +2258,8 @@ static int super_validate(struct raid_set *rs, struct md_rdev *rdev) if (!mddev->events && super_init_validation(rs, rdev)) return -EINVAL; - if (le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) { + if (le32_to_cpu(sb->compat_features) && + le32_to_cpu(sb->compat_features) != FEATURE_FLAG_SUPPORTS_V190) { rs->ti->error = "Unable to assemble array: Unknown flag(s) in compatible feature flags"; return -EINVAL; }