What is the BUG() call in ll_rw_blk.c (2.4.26) for?

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void submit_bh(int rw, struct buffer_head * bh)
{
~ int count = bh->b_size >> 9;

~ if (!test_bit(BH_Lock, &bh->b_state))
~ BUG();

Does anyone know what that BUG(); is testing? We're seeing it and want to track down what we're doing that is causing it.

It's at line 1289 of drivers/block/ll_rw_blk.c

Thanks!

- -Tom

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You must lock the buffer_head before calling submit_bh. If the buffer_head is not locked, you see the BUG.

Shaggy

David Kleikamp
IBM Linux Technology Center