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dma: mpc512x: fix freeing resources in mpc_dma_probe() and mpc_dma_remove() 

Fix mpc_dma_probe() error path and mpc_dma_remove(): manually free IRQs and
dispose IRQ mappings before devm_* takes care of other resources.
Moreover replace devm_request_irq() with request_irq() since there is no need
to use it because the original code always frees IRQ manually with
devm_free_irq(). Replace devm_free_irq() with free_irq() accordingly.

Signed-off-by: Alexander Popov <a13xp0p0v88@gmail.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Alexander Popov 2014-04-23 17:53:26 +04:00 committed by Vinod Koul
parent 62057d3375
commit baca66f796
1 changed files with 38 additions and 17 deletions
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55
drivers/dma/mpc512x_dma.c
View File

@ -657,13 +657,15 @@ static int mpc_dma_probe(struct platform_device *op)
mdma = devm_kzalloc(dev, sizeof(struct mpc_dma), GFP_KERNEL);
if (!mdma) {
dev_err(dev, "Memory exhausted!\n");
return -ENOMEM;
retval = -ENOMEM;
goto err;
}
mdma->irq = irq_of_parse_and_map(dn, 0);
if (mdma->irq == NO_IRQ) {
dev_err(dev, "Error mapping IRQ!\n");
return -EINVAL;
retval = -EINVAL;
goto err;
}
if (of_device_is_compatible(dn, "fsl,mpc8308-dma")) {
@ -671,14 +673,15 @@ static int mpc_dma_probe(struct platform_device *op)
mdma->irq2 = irq_of_parse_and_map(dn, 1);
if (mdma->irq2 == NO_IRQ) {
dev_err(dev, "Error mapping IRQ!\n");
return -EINVAL;
retval = -EINVAL;
goto err_dispose1;
}
}
retval = of_address_to_resource(dn, 0, &res);
if (retval) {
dev_err(dev, "Error parsing memory region!\n");
return retval;
goto err_dispose2;
}
regs_start = res.start;
@ -686,31 +689,34 @@ static int mpc_dma_probe(struct platform_device *op)
if (!devm_request_mem_region(dev, regs_start, regs_size, DRV_NAME)) {
dev_err(dev, "Error requesting memory region!\n");
return -EBUSY;
retval = -EBUSY;
goto err_dispose2;
}
mdma->regs = devm_ioremap(dev, regs_start, regs_size);
if (!mdma->regs) {
dev_err(dev, "Error mapping memory region!\n");
return -ENOMEM;
retval = -ENOMEM;
goto err_dispose2;
}
mdma->tcd = (struct mpc_dma_tcd *)((u8 *)(mdma->regs)
+ MPC_DMA_TCD_OFFSET);
retval = devm_request_irq(dev, mdma->irq, &mpc_dma_irq, 0, DRV_NAME,
mdma);
retval = request_irq(mdma->irq, &mpc_dma_irq, 0, DRV_NAME, mdma);
if (retval) {
dev_err(dev, "Error requesting IRQ!\n");
return -EINVAL;
retval = -EINVAL;
goto err_dispose2;
}
if (mdma->is_mpc8308) {
retval = devm_request_irq(dev, mdma->irq2, &mpc_dma_irq, 0,
DRV_NAME, mdma);
retval = request_irq(mdma->irq2, &mpc_dma_irq, 0,
DRV_NAME, mdma);
if (retval) {
dev_err(dev, "Error requesting IRQ2!\n");
return -EINVAL;
retval = -EINVAL;
goto err_free1;
}
}
@ -793,12 +799,23 @@ static int mpc_dma_probe(struct platform_device *op)
/* Register DMA engine */
dev_set_drvdata(dev, mdma);
retval = dma_async_device_register(dma);
if (retval) {
devm_free_irq(dev, mdma->irq, mdma);
irq_dispose_mapping(mdma->irq);
}
if (retval)
goto err_free2;
return retval;
err_free2:
if (mdma->is_mpc8308)
free_irq(mdma->irq2, mdma);
err_free1:
free_irq(mdma->irq, mdma);
err_dispose2:
if (mdma->is_mpc8308)
irq_dispose_mapping(mdma->irq2);
err_dispose1:
irq_dispose_mapping(mdma->irq);
err:
return retval;
}
static int mpc_dma_remove(struct platform_device *op)
@ -807,7 +824,11 @@ static int mpc_dma_remove(struct platform_device *op)
struct mpc_dma *mdma = dev_get_drvdata(dev);
dma_async_device_unregister(&mdma->dma);
devm_free_irq(dev, mdma->irq, mdma);
if (mdma->is_mpc8308) {
free_irq(mdma->irq2, mdma);
irq_dispose_mapping(mdma->irq2);
}
free_irq(mdma->irq, mdma);
irq_dispose_mapping(mdma->irq);
return 0;