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-rw-r--r--block/blk-lib.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/block/blk-lib.c b/block/blk-lib.c
index 019e09bb9c0e..0d1811e57ac7 100644
--- a/block/blk-lib.c
+++ b/block/blk-lib.c
@@ -47,6 +47,15 @@ int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
op = REQ_OP_DISCARD;
}
+ /* In case the discard granularity isn't set by buggy device driver */
+ if (WARN_ON_ONCE(!q->limits.discard_granularity)) {
+ char dev_name[BDEVNAME_SIZE];
+
+ bdevname(bdev, dev_name);
+ pr_err_ratelimited("%s: Error: discard_granularity is 0.\n", dev_name);
+ return -EOPNOTSUPP;
+ }
+
bs_mask = (bdev_logical_block_size(bdev) >> 9) - 1;
if ((sector | nr_sects) & bs_mask)
return -EINVAL;