How to determine the IRQ number for a USB device?
May 18, 2013 · However, I am wondering how I would find what IRQ line (IRQ number) the device is interrupting on? That is, how do I determine what the value of the argument unsigned int irq …
What is the difference between FIQ and IRQ interrupt system?
Jun 10, 2009 · I want to know the difference between FIQ and IRQ interrupt system in any microprocessor, e.g: ARM926EJ.
Linux UIO IRQ related periodic CPU usage - Stack Overflow
Apr 17, 2025 · I have an Intel Arria 10 SoC FPGA system with 5.4.104-lts Linux built with Yocto 3.3.1 and Poky. The installed FPGA image is doing nothing more than making interrupts to an …
Understanding kernel message 'nobody cared (try booting with …
Dec 13, 2012 · 21 I'm trying to understand the meaning of the following message: irq N:nobody cared (try booting with the "irqpoll" option) Does this mean the IRQ handler not processing the …
spin_lock_irqsave vs spin_lock_irq - Stack Overflow
Nov 26, 2015 · spin_lock_irqsave is basically used to save the interrupt state before taking the spin lock, this is because spin lock disables the interrupt, when the lock is taken in interrupt …
c - What are the various ways to disable and re-enable interrupts …
Mar 26, 2022 · The standard technique to enforce atomic access to volatile variables shared with ISRs, via "atomic access guards" or "interrupt guards", in particular …
c - Does using the `__irq` specified for a function pointer …
Aug 27, 2021 · void Reset_Handler(void) { // ... no interesting } I read up on __irq and the ARM compiler docs state the following: The compiler generates function entry and exit sequences …
What limits the number of IRQ descriptors a Linux platform can …
Nov 18, 2024 · So I have an older hardware platform, which has a hard-coded NR_IRQS defined in the kernel to specify the number of available IRQ descriptors. This limit corresponds to the …
Interrupt handling in Device Driver - Stack Overflow
The Same Interrupt number has to be mentioned in the Device Tree entry for instantiation of device driver. The Device driver's usual probe function parses the Device tree data structure …
Linux kernel interrupt handler mutex protection? - Stack Overflow
Jul 4, 2011 · The code you posted does not look like a device driver irq handler. The irq handlers in kernel drivers return irqreturn_t and take in int irq_no, void * data as arguements. You have …