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/*
 * Subject to the GPL, version 2.
 */

#include "xmalloc.h"

struct panic_handler {
	void *arg;
	pid_t pid;
	bool is_enabled;
	void (*on_panic)(void *arg);
	struct panic_handler *next;
};

static struct panic_handler *panic_handlers;

void panic_handler_add(void (*on_panic)(void *arg), void *arg)
{
	struct panic_handler *handler = xmallocz(sizeof(*handler));

	handler->arg		= arg;
	handler->pid		= getpid();
	handler->is_enabled	= true;
	handler->on_panic	= on_panic;
	handler->next		= panic_handlers;
	panic_handlers		= handler;
};

void call_panic_handlers(void)
{
	struct panic_handler *it;
	pid_t pid = getpid();

	for (it = panic_handlers; it; it = it->next) {
		if (it->pid == pid && it->is_enabled) {
			it->is_enabled = false;
			it->on_panic(it->arg);
		}
	}
}
tch/drivers/usb/mon?id=433e19cf33d34bb6751c874a9c00980552fe508c'>patch) treece6547ef2987fbb289fa28f03536328a42781651 /drivers/usb/mon parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/mon')