Commit 6427a765 authored by Eric W. Biederman's avatar Eric W. Biederman Committed by Greg Kroah-Hartman

uio: Cleanup irq handling.

Change the value of UIO_IRQ_NONE -2 to 0.  0 is well defined in the rest
of the kernel as the value to indicate an irq has not been assigned.

Update the calls to request_irq and free_irq to only ignore UIO_IRQ_NONE
and UIO_IRQ_CUSTOM allowing the rest of the kernel's possible irq
numbers to be used.
Signed-off-by: default avatarEric W. Biederman <ebiederm@aristanetworks.com>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarHans J. Koch <hjk@linutronix.de>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 70a9156b
......@@ -512,7 +512,7 @@ static unsigned int uio_poll(struct file *filep, poll_table *wait)
struct uio_listener *listener = filep->private_data;
struct uio_device *idev = listener->dev;
if (idev->info->irq == UIO_IRQ_NONE)
if (!idev->info->irq)
return -EIO;
poll_wait(filep, &idev->wait, wait);
......@@ -530,7 +530,7 @@ static ssize_t uio_read(struct file *filep, char __user *buf,
ssize_t retval;
s32 event_count;
if (idev->info->irq == UIO_IRQ_NONE)
if (!idev->info->irq)
return -EIO;
if (count != sizeof(s32))
......@@ -578,7 +578,7 @@ static ssize_t uio_write(struct file *filep, const char __user *buf,
ssize_t retval;
s32 irq_on;
if (idev->info->irq == UIO_IRQ_NONE)
if (!idev->info->irq)
return -EIO;
if (count != sizeof(s32))
......@@ -825,9 +825,9 @@ int __uio_register_device(struct module *owner,
info->uio_dev = idev;
if (idev->info->irq >= 0) {
ret = request_irq(idev->info->irq, uio_interrupt,
idev->info->irq_flags, idev->info->name, idev);
if (info->irq && (info->irq != UIO_IRQ_CUSTOM)) {
ret = request_irq(info->irq, uio_interrupt,
info->irq_flags, info->name, idev);
if (ret)
goto err_request_irq;
}
......@@ -863,7 +863,7 @@ void uio_unregister_device(struct uio_info *info)
uio_free_minor(idev);
if (info->irq >= 0)
if (info->irq && (info->irq != UIO_IRQ_CUSTOM))
free_irq(info->irq, idev);
uio_dev_del_attributes(idev);
......
......@@ -108,7 +108,7 @@ extern void uio_event_notify(struct uio_info *info);
/* defines for uio_info->irq */
#define UIO_IRQ_CUSTOM -1
#define UIO_IRQ_NONE -2
#define UIO_IRQ_NONE 0
/* defines for uio_mem->memtype */
#define UIO_MEM_NONE 0
......
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