/*
 * linux/kernel/irq/resend.c
 *
 * Copyright (C) 1992, 1998-2006 Linus Torvalds, Ingo Molnar
 * Copyright (C) 2005-2006, Thomas Gleixner
 *
 * This file contains the IRQ-resend code
 *
 * If the interrupt is waiting to be processed, we try to re-run it.
 * We can't directly run it from here since the caller might be in an
 * interrupt-protected region. Not all irq controller chips can
 * retrigger interrupts at the hardware level, so in those cases
 * we allow the resending of IRQs via a tasklet.
 */

#include <linux/irq.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/interrupt.h>

#include "internals.h"

#ifdef CONFIG_HARDIRQS_SW_RESEND

/* Bitmap to handle software resend of interrupts: */
static DECLARE_BITMAP(irqs_resend, IRQ_BITMAP_BITS);

/*
 * Run software resends of IRQ's
 */
static void resend_irqs(unsigned long arg)
{
	struct irq_desc *desc;
	int irq;

	while (!bitmap_empty(irqs_resend, nr_irqs)) {
		irq = find_first_bit(irqs_resend, nr_irqs);
		clear_bit(irq, irqs_resend);
		desc = irq_to_desc(irq);
		local_irq_disable();
		desc->handle_irq(desc);
		local_irq_enable();
	}
}

/* Tasklet to handle resend: */
static DECLARE_TASKLET(resend_tasklet, resend_irqs, 0);

#endif

/*
 * IRQ resend
 *
 * Is called with interrupts disabled and desc->lock held.
 */
void check_irq_resend(struct irq_desc *desc)
{
	/*
	 * We do not resend level type interrupts. Level type
	 * interrupts are resent by hardware when they are still
	 * active. Clear the pending bit so suspend/resume does not
	 * get confused.
	 */
	if (irq_settings_is_level(desc)) {
		desc->istate &= ~IRQS_PENDING;
		return;
	}
	if (desc->istate & IRQS_REPLAY)
		return;
	if (desc->istate & IRQS_PENDING) {
		desc->istate &= ~IRQS_PENDING;
		desc->istate |= IRQS_REPLAY;

		if (!desc->irq_data.chip->irq_retrigger ||
		    !desc->irq_data.chip->irq_retrigger(&desc->irq_data)) {
#ifdef CONFIG_HARDIRQS_SW_RESEND
			unsigned int irq = irq_desc_get_irq(desc);

			/*
			 * If the interrupt is running in the thread
			 * context of the parent irq we need to be
			 * careful, because we cannot trigger it
			 * directly.
			 */
			if (irq_settings_is_nested_thread(desc)) {
				/*
				 * If the parent_irq is valid, we
				 * retrigger the parent, otherwise we
				 * do nothing.
				 */
				if (!desc->parent_irq)
					return;
				irq = desc->parent_irq;
			}
			/* Set it pending and activate the softirq: */
			set_bit(irq, irqs_resend);
			tasklet_schedule(&resend_tasklet);
#endif
		}
	}
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>perf</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/bench?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>bench</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/bench/futex.h?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>futex.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Dan Carpenter &lt;dan.carpenter@oracle.com&gt;</td><td class='right'>2017-01-30 10:55:04 +0100</td></tr>
<tr><th>committer</th><td>David S. Miller &lt;davem@davemloft.net&gt;</td><td class='right'>2017-01-30 16:37:55 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/bench/futex.h?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/bench/futex.h?id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>a45096fd9e8aaeea2eac1f1999a3d17dfeb0d02b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/bench/futex.h?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>tools/perf/bench/futex.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/bench/futex.h?h=nds-private-remove&amp;id=1930b60352e7e195f55b27cde15d2a8f43342a8b'>1930b60352e7e195f55b27cde15d2a8f43342a8b</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/bench/futex.h?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4&amp;id2=1930b60352e7e195f55b27cde15d2a8f43342a8b'>diff</a>)</td></tr></table>
<div class='commit-subject'>smc: some potential use after free bugs</div><div class='commit-msg'>Say we got really unlucky and these failed on the last iteration, then
it could lead to a use after free bug.

Fixes: cd6851f30386 ("smc: remote memory buffers (RMBs)")
Signed-off-by: Dan Carpenter &lt;dan.carpenter@oracle.com&gt;
Signed-off-by: Ursula Braun &lt;ubraun@linux.vnet.ibm.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=cdaf25dfc058ee6f7a7b2e2353de00fa288c0cd4'>Diffstat</a> (limited to 'tools/perf/bench/futex.h')</div><table summary='diffstat' class='diffstat'>