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dmaengine i.MX SDMA: lock channel 0 

channel0 of the sdma engine is the configuration channel. It
is a shared resource and thus must be protected by a mutex.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Sascha Hauer 2011-08-25 11:03:35 +02:00 committed by Vinod Koul
parent 981ed70d8e
commit 73eab978ad
1 changed files with 16 additions and 2 deletions
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18
drivers/dma/imx-sdma.c
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@ -318,6 +318,7 @@ struct sdma_engine {
dma_addr_t context_phys;
struct dma_device dma_device;
struct clk *clk;
struct mutex channel_0_lock;
struct sdma_script_start_addrs *script_addrs;
};
@ -415,11 +416,15 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
dma_addr_t buf_phys;
int ret;
mutex_lock(&sdma->channel_0_lock);
buf_virt = dma_alloc_coherent(NULL,
size,
&buf_phys, GFP_KERNEL);
if (!buf_virt)
return -ENOMEM;
if (!buf_virt) {
ret = -ENOMEM;
goto err_out;
}
bd0->mode.command = C0_SETPM;
bd0->mode.status = BD_DONE | BD_INTR | BD_WRAP | BD_EXTD;
@ -433,6 +438,9 @@ static int sdma_load_script(struct sdma_engine *sdma, void *buf, int size,
dma_free_coherent(NULL, size, buf_virt, buf_phys);
err_out:
mutex_unlock(&sdma->channel_0_lock);
return ret;
}
@ -656,6 +664,8 @@ static int sdma_load_context(struct sdma_channel *sdmac)
dev_dbg(sdma->dev, "event_mask0 = 0x%08x\n", sdmac->event_mask0);
dev_dbg(sdma->dev, "event_mask1 = 0x%08x\n", sdmac->event_mask1);
mutex_lock(&sdma->channel_0_lock);
memset(context, 0, sizeof(*context));
context->channel_state.pc = load_address;
@ -676,6 +686,8 @@ static int sdma_load_context(struct sdma_channel *sdmac)
ret = sdma_run_channel(&sdma->channel[0]);
mutex_unlock(&sdma->channel_0_lock);
return ret;
}
@ -1274,6 +1286,8 @@ static int __init sdma_probe(struct platform_device *pdev)
if (!sdma)
return -ENOMEM;
mutex_init(&sdma->channel_0_lock);
sdma->dev = &pdev->dev;
iores = platform_get_resource(pdev, IORESOURCE_MEM, 0);