tree 0394dd2685426d192027fb5b1f0c4dbb5fd6da27
parent 03383736348bb73a45f8460afca3c5f5bd1be172
author Webb Scales <webbnh@hp.com> 1422053015 -0600
committer James Bottomley <JBottomley@Parallels.com> 1422899860 -0800

hpsa: fix race between abort handler and main i/o path

This means changing the allocator to reference count commands.
The reference count is now the authoritative indicator of whether a
command is allocated or not.  The h->cmd_pool_bits bitmap is now
only a heuristic hint to speed up the allocation process, it is no
longer the authoritative record of allocated commands.

Since we changed the command allocator to use reference counting
as the authoritative indicator of whether a command is allocated,
fail_all_outstanding_cmds needs to use the reference count not
h->cmd_pool_bits for this purpose.

Fix hpsa_drain_accel_commands to use the reference count as the
authoritative indicator of whether a command is allocated instead of
the h->cmd_pool_bits bitmap.

Reviewed-by: Scott Teel <scott.teel@pmcs.com>
Signed-off-by: Don Brace <don.brace@pmcs.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>