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author | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2012-11-22 17:19:09 (GMT) |
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committer | Thomas Petazzoni <thomas.petazzoni@free-electrons.com> | 2012-11-22 17:19:09 (GMT) |
commit | 2d0a074517da34a6386bdd9a22bc006c8fa21044 (patch) | |
tree | e0353bf8c5cdf8edf41312ea4bc0a7623726dfae /drivers/dma | |
parent | c4b4b732b2e99e6e302d90d57f2a4f5c9516d9a3 (diff) | |
download | linux-2d0a074517da34a6386bdd9a22bc006c8fa21044.tar.xz |
dma: mv_xor: use request_irq() instead of devm_request_irq()
Even through the usage of devm_*() functions is generally recommended
over their classic variants, in the case of devm_request_irq()
combined with irq_of_parse_and_map(), it doesn't work nicely.
We have the following scenario:
irq_of_parse_and_map(...)
devm_request_irq(...)
For some reason, the driver initialization fails at a later
point. Since irq_of_parse_and_map() is no device-managed, we do a:
irq_dispose_mapping(...)
Unfortunately, this doesn't work, because the free_irq() must be done
prior to calling irq_dispose_mapping(). But with the devm mechanism,
the automatic free_irq() would happen only after we get out of the
->probe() function.
So basically, we revert to using request_irq() with traditional error
handling, so that in case of error, free_irq() gets called before
irq_dispose_mapping().
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r-- | drivers/dma/mv_xor.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c index 2c69b89..0d4c24e 100644 --- a/drivers/dma/mv_xor.c +++ b/drivers/dma/mv_xor.c @@ -1162,9 +1162,8 @@ mv_xor_channel_add(struct mv_xor_device *xordev, /* clear errors before enabling interrupts */ mv_xor_device_clear_err_status(mv_chan); - ret = devm_request_irq(&pdev->dev, mv_chan->irq, - mv_xor_interrupt_handler, - 0, dev_name(&pdev->dev), mv_chan); + ret = request_irq(mv_chan->irq, mv_xor_interrupt_handler, + 0, dev_name(&pdev->dev), mv_chan); if (ret) goto err_free_dma; @@ -1185,14 +1184,14 @@ mv_xor_channel_add(struct mv_xor_device *xordev, ret = mv_xor_memcpy_self_test(mv_chan); dev_dbg(&pdev->dev, "memcpy self test returned %d\n", ret); if (ret) - goto err_free_dma; + goto err_free_irq; } if (dma_has_cap(DMA_XOR, dma_dev->cap_mask)) { ret = mv_xor_xor_self_test(mv_chan); dev_dbg(&pdev->dev, "xor self test returned %d\n", ret); if (ret) - goto err_free_dma; + goto err_free_irq; } dev_info(&pdev->dev, "Marvell XOR: " @@ -1205,6 +1204,8 @@ mv_xor_channel_add(struct mv_xor_device *xordev, dma_async_device_register(dma_dev); return mv_chan; +err_free_irq: + free_irq(mv_chan->irq, mv_chan); err_free_dma: dma_free_coherent(&pdev->dev, MV_XOR_POOL_SIZE, mv_chan->dma_desc_pool_virt, mv_chan->dma_desc_pool); |