diff options
Diffstat (limited to 'arch/arm/mach-tegra/dma.c')
| -rw-r--r-- | arch/arm/mach-tegra/dma.c | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/arm/mach-tegra/dma.c b/arch/arm/mach-tegra/dma.c index 7eb0bb758b67..ad9f3a05a68b 100644 --- a/arch/arm/mach-tegra/dma.c +++ b/arch/arm/mach-tegra/dma.c @@ -132,6 +132,8 @@ struct tegra_dma_channel { #define NV_DMA_MAX_CHANNELS 32 +static DEFINE_SPINLOCK(global_dma_lock); + static DECLARE_BITMAP(channel_usage, NV_DMA_MAX_CHANNELS); static struct tegra_dma_channel dma_channels[NV_DMA_MAX_CHANNELS]; @@ -471,6 +473,9 @@ struct tegra_dma_channel *tegra_dma_allocate_channel(int mode) { int channel; struct tegra_dma_channel *ch; + unsigned long irq_flags; + + spin_lock_irqsave(&global_dma_lock, irq_flags); /* first channel is the shared channel */ if (mode & TEGRA_DMA_SHARED) { @@ -478,10 +483,14 @@ struct tegra_dma_channel *tegra_dma_allocate_channel(int mode) } else { channel = find_first_zero_bit(channel_usage, ARRAY_SIZE(dma_channels)); - if (channel >= ARRAY_SIZE(dma_channels)) - return ERR_PTR(ENODEV); + if (channel >= ARRAY_SIZE(dma_channels)) { + spin_unlock_irqrestore(&global_dma_lock, irq_flags); + return ERR_PTR(-ENODEV); + } } __set_bit(channel, channel_usage); + spin_unlock_irqrestore(&global_dma_lock, irq_flags); + ch = &dma_channels[channel]; ch->mode = mode; return ch; @@ -490,10 +499,14 @@ EXPORT_SYMBOL(tegra_dma_allocate_channel); void tegra_dma_free_channel(struct tegra_dma_channel *ch) { + unsigned long irq_flags; if (ch->mode & TEGRA_DMA_SHARED) return; tegra_dma_cancel(ch); + spin_lock_irqsave(&global_dma_lock, irq_flags); __clear_bit(ch->id, channel_usage); + spin_unlock_irqrestore(&global_dma_lock, irq_flags); + } EXPORT_SYMBOL(tegra_dma_free_channel); |