Commit 6cf18e69 authored Feb 15, 2017 by Thomas Gleixner Committed by Greg Kroah-Hartman Feb 15, 2017

goldfish: Sanitize the broken interrupt handler



This interrupt handler is broken in several ways:

  - It loops forever when the op code is not decodeable

  - It never returns IRQ_HANDLED because the only way to exit the loop
    returns IRQ_NONE unconditionally.

The whole concept of this is broken. Creating devices in an interrupt
handler is beyond any point of sanity.

Make it at least behave halfways sane so accidental users do not have to
deal with a hard to debug lockup.

Fixes: e809c22b ("goldfish: add the goldfish virtual bus")
Reported-by: Gabriel C <nix.or.die@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 47512cfd

drivers/platform/goldfish/pdev_bus.c

+8 −5

Original line number	Diff line number	Diff line
		@@ -157,23 +157,26 @@ static int goldfish_new_pdev(void)
		static irqreturn_t goldfish_pdev_bus_interrupt(int irq, void *dev_id)
		{
		irqreturn_t ret = IRQ_NONE;

		while (1) {
		u32 op = readl(pdev_bus_base + PDEV_BUS_OP);
		switch (op) {
		case PDEV_BUS_OP_DONE:
		return IRQ_NONE;

		switch (op) {
		case PDEV_BUS_OP_REMOVE_DEV:
		goldfish_pdev_remove();
		ret = IRQ_HANDLED;
		break;

		case PDEV_BUS_OP_ADD_DEV:
		goldfish_new_pdev();
		ret = IRQ_HANDLED;
		break;

		case PDEV_BUS_OP_DONE:
		default:
		return ret;
		}
		ret = IRQ_HANDLED;
		}
		return ret;
		}

		static int goldfish_pdev_bus_probe(struct platform_device *pdev)

Admin message