Messages in this thread | | | Date | Sun, 23 Jul 2006 14:11:01 +0100 | From | James Courtier-Dutton <> | Subject | Cross platform method for detecting hot unplug in irq handler |
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Hi,
I am writing a driver for a PCMCIA device. When the card is removed, the driver's IRQ handler is called. The first thing the IRQ handler does is read a status register from the card's IOPORT. On the ia32 (i386) platform, the resulting status read will return 0xffffffff. If the driver reads this value, it assumes the card has been removed and acts accordingly.
Is this a reliable way of detecting PCMCIA or Hotplug card removal inside an IRQ handler? Is it consistent cross platforms. E.g. ia64, amd64, PPC, MIPS etc.? Does a more reliable detection method exist in the kernel?
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