Block layer caching can't work if a block is bigger than BUFSIZE which
is used for the caching chunks. Instead of ending up with a rdbufsize
of 0, which leads to strange errors on device access, just refuse this
outright.
Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
---
common/block.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/common/block.c b/common/block.c
index 7f28b56419e2..c39269d3a692 100644
--- a/common/block.c
+++ b/common/block.c
@@ -388,6 +388,11 @@ int blockdevice_register(struct block_device *blk)
dev_dbg(blk->dev, "rdbufsize: %d blockbits: %d blkmask: 0x%08x\n",
blk->rdbufsize, blk->blockbits, blk->blkmask);
+ if (!blk->rdbufsize) {
+ pr_warn("block size of %u not supported\n", BLOCKSIZE(blk));
+ return -ENOSYS;
+ }
+
for (i = 0; i < 8; i++) {
struct chunk *chunk = xzalloc(sizeof(*chunk));
chunk->data = dma_alloc(BUFSIZE);
--
2.39.2
