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uio: fix irq init with dt support & irq not defined 

This change also does a bit of a unification for the IRQ init code.

But the actual problem is that UIO_IRQ_NONE == 0, so for the DT case where
UIO_IRQ_NONE gets assigned to `uioinfo->irq`, a 2nd initialization will get
triggered (for the IRQ) and this one will exit via `goto bad1`.

As far as things seem to go, the only case where UIO_IRQ_NONE seems valid,
is when using a device-tree. The driver has some legacy support for old
platform_data structures. It looks like, for platform_data a non-existent
IRQ is an invalid case (or was considered an invalid case).
Which is why -ENXIO is treated only when a DT is used.

Signed-off-by: Dragos Bogdan <dragos.bogdan@analog.com>
Signed-off-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Acked-by: Damian Hobson-Garcia <dhobsong@igel.co.jp>
Link: https://lore.kernel.org/r/20191105073212.16719-1-alexandru.ardelean@analog.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandru Ardelean 2019-11-05 09:32:12 +02:00 committed by Greg Kroah-Hartman
parent 2a9edd056e
commit 3ec1bd7693
1 changed files with 4 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/uio/uio_dmem_genirq.c
View File

@ -151,8 +151,6 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
int i;
if (pdev->dev.of_node) {
int irq;
/* alloc uioinfo for one device */
uioinfo = kzalloc(sizeof(*uioinfo), GFP_KERNEL);
if (!uioinfo) {
@ -163,13 +161,6 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
uioinfo->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "%pOFn",
pdev->dev.of_node);
uioinfo->version = "devicetree";
/* Multiple IRQs are not supported */
irq = platform_get_irq(pdev, 0);
if (irq == -ENXIO)
uioinfo->irq = UIO_IRQ_NONE;
else
uioinfo->irq = irq;
}
if (!uioinfo || !uioinfo->name || !uioinfo->version) {
@ -199,8 +190,11 @@ static int uio_dmem_genirq_probe(struct platform_device *pdev)
mutex_init(&priv->alloc_lock);
if (!uioinfo->irq) {
/* Multiple IRQs are not supported */
ret = platform_get_irq(pdev, 0);
if (ret < 0)
if (ret == -ENXIO && pdev->dev.of_node)
ret = UIO_IRQ_NONE;
else if (ret < 0)
goto bad1;
uioinfo->irq = ret;
}