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authorAtsushi Nemoto <anemo@mba.ocn.ne.jp>2009-03-06 14:07:14 +0300
committerDan Williams <dan.j.williams@intel.com>2009-03-26 19:48:09 +0300
commit0f571515c332e00b3515dbe0859ceaa30ab66e00 (patch)
tree6d67c555714264dda749e387cee6738f770abc5d /include/linux/dmaengine.h
parente44e0aa3cfa97cddff01704751a4b25151830c72 (diff)
downloadlinux-0f571515c332e00b3515dbe0859ceaa30ab66e00.tar.xz
dmaengine: Add privatecnt to revert DMA_PRIVATE property
Currently dma_request_channel() set DMA_PRIVATE capability but never clear it. So if a public channel was once grabbed by dma_request_channel(), the device stay PRIVATE forever. Add privatecnt member to dma_device to correctly revert it. [lg@denx.de: fix bad usage of 'chan' in dma_async_device_register] Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp> Acked-by: Maciej Sosnowski <maciej.sosnowski@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'include/linux/dmaengine.h')
-rw-r--r--include/linux/dmaengine.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/dmaengine.h b/include/linux/dmaengine.h
index 2afc2c95e42d..2e2aa3df170c 100644
--- a/include/linux/dmaengine.h
+++ b/include/linux/dmaengine.h
@@ -202,6 +202,7 @@ struct dma_async_tx_descriptor {
/**
* struct dma_device - info on the entity supplying DMA services
* @chancnt: how many DMA channels are supported
+ * @privatecnt: how many DMA channels are requested by dma_request_channel
* @channels: the list of struct dma_chan
* @global_node: list_head for global dma_device_list
* @cap_mask: one or more dma_capability flags
@@ -224,6 +225,7 @@ struct dma_async_tx_descriptor {
struct dma_device {
unsigned int chancnt;
+ unsigned int privatecnt;
struct list_head channels;
struct list_head global_node;
dma_cap_mask_t cap_mask;
@@ -352,6 +354,13 @@ __dma_cap_set(enum dma_transaction_type tx_type, dma_cap_mask_t *dstp)
set_bit(tx_type, dstp->bits);
}
+#define dma_cap_clear(tx, mask) __dma_cap_clear((tx), &(mask))
+static inline void
+__dma_cap_clear(enum dma_transaction_type tx_type, dma_cap_mask_t *dstp)
+{
+ clear_bit(tx_type, dstp->bits);
+}
+
#define dma_cap_zero(mask) __dma_cap_zero(&(mask))
static inline void __dma_cap_zero(dma_cap_mask_t *dstp)
{