dmaengine: ensure all DMA engine drivers initialize their cookies
Ensure all DMA engine drivers initialize their cookies in the same way,
so that they all behave in a similar fashion. This means their first
issued cookie will be 2 rather than 1, and will increment to INT_MAX
before returning 1 and starting over.
In connection with this, Dan Williams said:
> Russell King wrote:
> > Secondly, some DMA engine drivers initialize the dma_chan cookie to 0,
> > others to 1. Is there a reason for this, or are these all buggy?
>
> I know that ioat and iop-adma expect 0 to mean "I have cleaned up this
> descriptor and it is idle", and would break if zero was an in-flight
> cookie value. The reserved usage of zero is an driver internal
> concern, but I have no problem formalizing it as a reserved value.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Jassi Brar <jassisinghbrar@gmail.com>
[imx-sdma.c & mxs-dma.c]
Tested-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Vinod Koul <vinod.koul@linux.intel.com>
diff --git a/drivers/dma/fsldma.c b/drivers/dma/fsldma.c
index 2f6c806..7d7384b 100644
--- a/drivers/dma/fsldma.c
+++ b/drivers/dma/fsldma.c
@@ -1292,6 +1292,7 @@
chan->idle = true;
chan->common.device = &fdev->common;
+ dma_cookie_init(&chan->common);
/* find the IRQ line, if it exists in the device tree */
chan->irq = irq_of_parse_and_map(node, 0);
diff --git a/drivers/dma/imx-dma.c b/drivers/dma/imx-dma.c
index 6731f19..f0485c0 100644
--- a/drivers/dma/imx-dma.c
+++ b/drivers/dma/imx-dma.c
@@ -347,6 +347,7 @@
spin_lock_init(&imxdmac->lock);
imxdmac->chan.device = &imxdma->dma_device;
+ dma_cookie_init(&imxdmac->chan);
imxdmac->channel = i;
/* Add the channel to the DMAC list */
diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index 981071e..ccfc7c4 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -1355,6 +1355,7 @@
spin_lock_init(&sdmac->lock);
sdmac->chan.device = &sdma->dma_device;
+ dma_cookie_init(&sdmac->chan);
sdmac->channel = i;
/*
diff --git a/drivers/dma/ioat/dma.c b/drivers/dma/ioat/dma.c
index 97e100c..31493d8 100644
--- a/drivers/dma/ioat/dma.c
+++ b/drivers/dma/ioat/dma.c
@@ -109,6 +109,7 @@
chan->reg_base = device->reg_base + (0x80 * (idx + 1));
spin_lock_init(&chan->cleanup_lock);
chan->common.device = dma;
+ dma_cookie_init(&chan->common);
list_add_tail(&chan->common.device_node, &dma->channels);
device->idx[idx] = chan;
init_timer(&chan->timer);
diff --git a/drivers/dma/iop-adma.c b/drivers/dma/iop-adma.c
index 4370b10..1f3a703 100644
--- a/drivers/dma/iop-adma.c
+++ b/drivers/dma/iop-adma.c
@@ -1545,6 +1545,7 @@
INIT_LIST_HEAD(&iop_chan->chain);
INIT_LIST_HEAD(&iop_chan->all_slots);
iop_chan->common.device = dma_dev;
+ dma_cookie_init(&iop_chan->common);
list_add_tail(&iop_chan->common.device_node, &dma_dev->channels);
if (dma_has_cap(DMA_MEMCPY, dma_dev->cap_mask)) {
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c
index 486353e..fa5d55f 100644
--- a/drivers/dma/mv_xor.c
+++ b/drivers/dma/mv_xor.c
@@ -1193,6 +1193,7 @@
INIT_LIST_HEAD(&mv_chan->completed_slots);
INIT_LIST_HEAD(&mv_chan->all_slots);
mv_chan->common.device = dma_dev;
+ dma_cookie_init(&mv_chan->common);
list_add_tail(&mv_chan->common.device_node, &dma_dev->channels);
diff --git a/drivers/dma/mxs-dma.c b/drivers/dma/mxs-dma.c
index 5f3492e..a2267f9 100644
--- a/drivers/dma/mxs-dma.c
+++ b/drivers/dma/mxs-dma.c
@@ -618,6 +618,7 @@
mxs_chan->mxs_dma = mxs_dma;
mxs_chan->chan.device = &mxs_dma->dma_device;
+ dma_cookie_init(&mxs_chan->chan);
tasklet_init(&mxs_chan->tasklet, mxs_dma_tasklet,
(unsigned long) mxs_chan);
diff --git a/drivers/dma/ppc4xx/adma.c b/drivers/dma/ppc4xx/adma.c
index 9752062..ced9882 100644
--- a/drivers/dma/ppc4xx/adma.c
+++ b/drivers/dma/ppc4xx/adma.c
@@ -4497,6 +4497,7 @@
INIT_LIST_HEAD(&chan->all_slots);
chan->device = adev;
chan->common.device = &adev->common;
+ dma_cookie_init(&chan->common);
list_add_tail(&chan->common.device_node, &adev->common.channels);
tasklet_init(&chan->irq_tasklet, ppc440spe_adma_tasklet,
(unsigned long)chan);
diff --git a/drivers/dma/shdma.c b/drivers/dma/shdma.c
index 50510ef..5c40886 100644
--- a/drivers/dma/shdma.c
+++ b/drivers/dma/shdma.c
@@ -1089,6 +1089,7 @@
/* reference struct dma_device */
new_sh_chan->common.device = &shdev->common;
+ dma_cookie_init(&new_sh_chan->common);
new_sh_chan->dev = shdev->common.dev;
new_sh_chan->id = id;