/* * UWB PAL support. * * Copyright (C) 2008 Cambridge Silicon Radio Ltd. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License version * 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see . */ #include #include #include #include #include "uwb-internal.h" /** * uwb_pal_init - initialize a UWB PAL * @pal: the PAL to initialize */ void uwb_pal_init(struct uwb_pal *pal) { INIT_LIST_HEAD(&pal->node); } EXPORT_SYMBOL_GPL(uwb_pal_init); /** * uwb_pal_register - register a UWB PAL * @pal: the PAL * * The PAL must be initialized with uwb_pal_init(). */ int uwb_pal_register(struct uwb_pal *pal) { struct uwb_rc *rc = pal->rc; int ret; if (pal->device) { /* create a link to the uwb_rc in the PAL device's directory. */ ret = sysfs_create_link(&pal->device->kobj, &rc->uwb_dev.dev.kobj, "uwb_rc"); if (ret < 0) return ret; /* create a link to the PAL in the UWB device's directory. */ ret = sysfs_create_link(&rc->uwb_dev.dev.kobj, &pal->device->kobj, pal->name); if (ret < 0) { sysfs_remove_link(&pal->device->kobj, "uwb_rc"); return ret; } } pal->debugfs_dir = uwb_dbg_create_pal_dir(pal); mutex_lock(&rc->uwb_dev.mutex); list_add(&pal->node, &rc->pals); mutex_unlock(&rc->uwb_dev.mutex); return 0; } EXPORT_SYMBOL_GPL(uwb_pal_register); static int find_rc(struct device *dev, const void *data) { const struct uwb_rc *target_rc = data; struct uwb_rc *rc = dev_get_drvdata(dev); if (rc == NULL) { WARN_ON(1); return 0; } if (rc == target_rc) { if (rc->ready == 0) return 0; else return 1; } return 0; } /** * Given a radio controller descriptor see if it is registered. * * @returns false if the rc does not exist or is quiescing; true otherwise. */ static bool uwb_rc_class_device_exists(struct uwb_rc *target_rc) { struct device *dev; dev = class_find_device(&uwb_rc_class, NULL, target_rc, find_rc); put_device(dev); return (dev != NULL); } /** * uwb_pal_unregister - unregister a UWB PAL * @pal: the PAL */ void uwb_pal_unregister(struct uwb_pal *pal) { struct uwb_rc *rc = pal->rc; uwb_radio_stop(pal); mutex_lock(&rc->uwb_dev.mutex); list_del(&pal->node); mutex_unlock(&rc->uwb_dev.mutex); debugfs_remove(pal->debugfs_dir); if (pal->device) { /* remove link to the PAL in the UWB device's directory. */ if (uwb_rc_class_device_exists(rc)) sysfs_remove_link(&rc->uwb_dev.dev.kobj, pal->name); /* remove link to uwb_rc in the PAL device's directory. */ sysfs_remove_link(&pal->device->kobj, "uwb_rc"); } } EXPORT_SYMBOL_GPL(uwb_pal_unregister); /** * uwb_rc_pal_init - initialize the PAL related parts of a radio controller * @rc: the radio controller */ void uwb_rc_pal_init(struct uwb_rc *rc) { INIT_LIST_HEAD(&rc->pals); } e19cf33d34bb6751c874a9c00980552fe508c'/>
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authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /include/sound/control.h
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 'include/sound/control.h')