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Dan Williams 6f49a57aa5 dmaengine: up-level reference counting to the module level 
Simply, if a client wants any dmaengine channel then prevent all dmaengine
modules from being removed.  Once the clients are done re-enable module
removal.

Why?, beyond reducing complication:
1/ Tracking reference counts per-transaction in an efficient manner, as
   is currently done, requires a complicated scheme to avoid cache-line
   bouncing effects.
2/ Per-transaction ref-counting gives the false impression that a
   dma-driver can be gracefully removed ahead of its user (net, md, or
   dma-slave)
3/ None of the in-tree dma-drivers talk to hot pluggable hardware, but
   if such an engine were built one day we still would not need to notify
   clients of remove events.  The driver can simply return NULL to a
   ->prep() request, something that is much easier for a client to handle.

Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
2009-01-06 11:38:14 -07:00
..
9p Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
802 hippi: convert driver to net_device_ops 2008-11-20 20:32:15 -08:00
8021q vlan: fix convertion to net_device_ops 2008-12-25 16:45:19 -08:00
appletalk net/appletalk: Remove redundant test 2008-12-25 18:04:51 -08:00
atm netdevice: Kill netdev->priv 2008-12-08 01:14:16 -08:00
ax25 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
bluetooth Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-23 17:56:23 -08:00
bridge Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 2008-11-28 02:19:15 -08:00
can can: merge error paths 2008-12-14 23:16:58 -08:00
core cpumask: prepare for iterators to only go to nr_cpu_ids/nr_cpumask_bits: net 2008-12-29 22:44:47 -08:00
dcb net: add DCNA attribute to the BCN interface for DCB 2008-12-21 20:10:29 -08:00
dccp net: Fix percpu counters deadlock 2008-12-29 23:04:08 -08:00
decnet net: Make static 2008-12-10 15:18:31 -08:00
dsa net: Make static 2008-12-10 15:18:31 -08:00
econet netns: Use net_eq() to compare net-namespaces for optimization. 2008-07-19 22:34:43 -07:00
ethernet eth: Declare an optimized compare_ether_addr_64bits() function 2008-11-23 23:24:32 -08:00
ipv4 dmaengine: up-level reference counting to the module level 2009-01-06 11:38:14 -07:00
ipv6 net: Fix percpu counters deadlock 2008-12-29 23:04:08 -08:00
ipx net: '&' redux 2008-11-03 18:21:05 -08:00
irda tty: Fix an ircomm warning and note another bug 2009-01-02 10:19:43 -08:00
iucv [S390] convert iucv printks to dev_xxx and pr_xxx macros. 2008-12-25 13:39:24 +01:00
key netns PF_KEY: per-netns /proc/pfkey 2008-11-25 17:59:00 -08:00
lapb
llc net: remove redundant argument comments 2008-11-21 17:15:03 -08:00
mac80211 mac80211: implement dynamic power save 2008-12-19 15:24:00 -05:00
netfilter cpumask: prepare for iterators to only go to nr_cpu_ids/nr_cpumask_bits: net 2008-12-29 22:44:47 -08:00
netlabel Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-15 20:03:50 -08:00
netlink netlink: allow empty nested attributes 2008-11-28 03:05:19 -08:00
netrom Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
packet net: Make sure BHs are disabled in sock_prot_inuse_add() 2008-11-24 00:09:29 -08:00
phonet Phonet: get rid of deferred work on the transmission path 2008-12-17 15:48:50 -08:00
rfkill rfkill: strip pointless notifier chain 2008-12-12 14:45:25 -05:00
rose Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next-2.6 2008-12-28 12:49:40 -08:00
sched cls_cgroup: clean up Kconfig 2008-12-29 19:40:46 -08:00
sctp sctp: Add validity check for SCTP_PARTIAL_DELIVERY_POINT socket option 2008-12-25 16:59:03 -08:00
sunrpc Merge branch 'devel' into next 2008-12-30 16:51:43 -05:00
tipc tipc: trivial endian annotation in debug statement 2008-11-07 23:37:50 -08:00
unix introduce new LSM hooks where vfsmount is available. 2008-12-31 18:07:37 -05:00
wanrouter netdevice wanrouter: Convert directly reference of netdev->priv 2008-11-20 04:26:21 -08:00
wireless mac80211: Fix HT channel selection 2008-12-19 15:22:54 -05:00
x25 net: '&' redux 2008-11-03 18:21:05 -08:00
xfrm net: make xfrm_statistics_seq_show use generic snmp_fold_field 2008-12-29 18:20:06 -08:00
compat.c reintroduce accept4 2008-11-19 18:49:57 -08:00
Kconfig net/ieee80211 -> drivers/net/ipw2x00/libipw_* rename 2008-11-21 11:08:18 -05:00
Makefile DCB: fix kconfig option 2008-11-25 01:02:08 -08:00
nonet.c
socket.c sanitize audit_fd_pair() 2009-01-04 15:14:41 -05:00
sysctl_net.c missing bits of net-namespace / sysctl 2008-07-27 09:45:34 -07:00
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