]> err.no Git - linux-2.6/commit
dmaengine: track the number of clients using a channel
authorDan Williams <dan.j.williams@intel.com>
Tue, 8 Jul 2008 18:58:21 +0000 (11:58 -0700)
committerDan Williams <dan.j.williams@intel.com>
Tue, 8 Jul 2008 18:58:21 +0000 (11:58 -0700)
commit7cc5bf9a3a84e5a02e23e5739fb894790b37c101
treeb526b348ed1b64884bf672924540bb5dc29cb211
parent9c402f4e196290692d998b188f9094deb1619e57
dmaengine: track the number of clients using a channel

Haavard's dma-slave interface would like to test for exclusive access to a
channel.  The standard channel refcounting is not sufficient in that it
tracks more than just client references, it is also inaccurate as reference
counts are percpu until the channel is removed.

This change also enables a future fix to deallocate resources when a client
declines to use a capable channel.

Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
drivers/dma/dmaengine.c
include/linux/dmaengine.h