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dmaengine: add a release for dma class devices and dependent infrastructure

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Resolves:
WARNING: at drivers/base/core.c:122 device_release+0x4d/0x52()
Device 'dma0chan0' does not have a release() function, it is broken and must be fixed.

The dma_chan_dev object is introduced to gear-match sysfs kobject and
dmaengine channel lifetimes.  When a channel is removed access to the
sysfs entries return -ENODEV until the kobject can be released.

The bulk of the change is updates to existing code to handle the extra
layer of indirection between a dma_chan and its struct device.

Reported-by: Alexander Beregalov <a.beregalov@gmail.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Cc: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams
2009-01-06 11:38:21 -07:00
parent 4fac7fa57c
commit 41d5e59c12
5 changed files with 157 additions and 75 deletions
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14
drivers/dma/dmatest.c
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@@ -80,7 +80,7 @@ static bool dmatest_match_channel(struct dma_chan *chan)
{
if (test_channel[0] == '\0')
return true;
return strcmp(dev_name(&chan->dev), test_channel) == 0;
return strcmp(dma_chan_name(chan), test_channel) == 0;
}
static bool dmatest_match_device(struct dma_device *device)
@@ -325,7 +325,7 @@ static int dmatest_add_channel(struct dma_chan *chan)
dtc = kmalloc(sizeof(struct dmatest_chan), GFP_KERNEL);
if (!dtc) {
pr_warning("dmatest: No memory for %s\n", dev_name(&chan->dev));
pr_warning("dmatest: No memory for %s\n", dma_chan_name(chan));
return -ENOMEM;
}
@@ -336,16 +336,16 @@ static int dmatest_add_channel(struct dma_chan *chan)
thread = kzalloc(sizeof(struct dmatest_thread), GFP_KERNEL);
if (!thread) {
pr_warning("dmatest: No memory for %s-test%u\n",
dev_name(&chan->dev), i);
dma_chan_name(chan), i);
break;
}
thread->chan = dtc->chan;
smp_wmb();
thread->task = kthread_run(dmatest_func, thread, "%s-test%u",
dev_name(&chan->dev), i);
dma_chan_name(chan), i);
if (IS_ERR(thread->task)) {
pr_warning("dmatest: Failed to run thread %s-test%u\n",
dev_name(&chan->dev), i);
dma_chan_name(chan), i);
kfree(thread);
break;
}
@@ -355,7 +355,7 @@ static int dmatest_add_channel(struct dma_chan *chan)
list_add_tail(&thread->node, &dtc->threads);
}
pr_info("dmatest: Started %u threads using %s\n", i, dev_name(&chan->dev));
pr_info("dmatest: Started %u threads using %s\n", i, dma_chan_name(chan));
list_add_tail(&dtc->node, &dmatest_channels);
nr_channels++;
@@ -408,7 +408,7 @@ static void __exit dmatest_exit(void)
list_del(&dtc->node);
dmatest_cleanup_channel(dtc);
pr_debug("dmatest: dropped channel %s\n",
dev_name(&dtc->chan->dev));
dma_chan_name(dtc->chan));
dma_release_channel(dtc->chan);
}
}