SA_INTERRUPT or SA_SHIRQ

[卜弋天]

Hi Devendra:    can you please tell me your kernel version?   SA_INTERRUPT is deprecated for many years. it is changed to be IRQF_DISABLED, which is also deprecated since 2.6.35.   in kernel 2.6.35, top half interrupt handler will be called with interrupts disabled,     and for SA_SHIRQ, it is changed to be IRQF_SHARED, you should check the return value of request_irq() to see whether your irq can be shared with former    registered irq which use the same int line. suppose you are registering irq19 for usb, and the BT module has reigstered irq19 with IRQF_SHARED flag, then you are lucky enough to reigter correctly for usb. opposite, if BT module registered irq19 without IRQF_SHARED flag, then BT will use irq19 alone, it means your register for usb will fail .  Best Regards
 Date: Wed, 22 Feb 2012 14:56:41 +0530
Subject: SA_INTERRUPT or SA_SHIRQ
From: devendra.rawat.singh at gmail.com
To: kernelnewbies at kernelnewbies.org

Hi All,

If I register an ISR using both the flags SA_INTERRUPT and SA_SHIRQ set, what kind of interrupt line will I get a dedicated one or a shared one ?
the exact definition is

request_irq(dev->pci_dev->irq, soc_intr, SA_INTERRUPT | SA_SHIRQ,

                      MODULE_NAME, dev);

thanks in advance,
Devendra


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