dummy-irq: require the user to specify an IRQ number
Make sure that we let the user know that without specifying IRQ#, dummy-irq driver is useless. Reported-by: Dave Jones <davej@redhat.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -19,7 +19,7 @@
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#include <linux/irq.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/interrupt.h>
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static int irq;
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static int irq = -1;
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static irqreturn_t dummy_interrupt(int irq, void *dev_id)
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static irqreturn_t dummy_interrupt(int irq, void *dev_id)
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{
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{
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@ -36,6 +36,10 @@ static irqreturn_t dummy_interrupt(int irq, void *dev_id)
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static int __init dummy_irq_init(void)
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static int __init dummy_irq_init(void)
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{
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{
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if (irq < 0) {
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printk(KERN_ERR "dummy-irq: no IRQ given. Use irq=N\n");
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return -EIO;
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}
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if (request_irq(irq, &dummy_interrupt, IRQF_SHARED, "dummy_irq", &irq)) {
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if (request_irq(irq, &dummy_interrupt, IRQF_SHARED, "dummy_irq", &irq)) {
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printk(KERN_ERR "dummy-irq: cannot register IRQ %d\n", irq);
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printk(KERN_ERR "dummy-irq: cannot register IRQ %d\n", irq);
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return -EIO;
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return -EIO;
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