/* * ALSA sequencer Client Manager * Copyright (c) 1998-1999 by Frank van de Pol * * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * */ #ifndef __SND_SEQ_CLIENTMGR_H #define __SND_SEQ_CLIENTMGR_H #include #include #include "seq_fifo.h" #include "seq_ports.h" #include "seq_lock.h" /* client manager */ struct snd_seq_user_client { struct file *file; /* file struct of client */ /* ... */ struct pid *owner; /* fifo */ struct snd_seq_fifo *fifo; /* queue for incoming events */ int fifo_pool_size; }; struct snd_seq_kernel_client { /* ... */ struct snd_card *card; }; struct snd_seq_client { snd_seq_client_type_t type; unsigned int accept_input: 1, accept_output: 1; char name[64]; /* client name */ int number; /* client number */ unsigned int filter; /* filter flags */ DECLARE_BITMAP(event_filter, 256); snd_use_lock_t use_lock; int event_lost; /* ports */ int num_ports; /* number of ports */ struct list_head ports_list_head; rwlock_t ports_lock; struct mutex ports_mutex; int convert32; /* convert 32->64bit */ /* output pool */ struct snd_seq_pool *pool; /* memory pool for this client */ union { struct snd_seq_user_client user; struct snd_seq_kernel_client kernel; } data; }; /* usage statistics */ struct snd_seq_usage { int cur; int peak; }; int client_init_data(void); int snd_sequencer_device_init(void); void snd_sequencer_device_done(void); /* get locked pointer to client */ struct snd_seq_client *snd_seq_client_use_ptr(int clientid); /* unlock pointer to client */ #define snd_seq_client_unlock(client) snd_use_lock_free(&(client)->use_lock) /* dispatch event to client(s) */ int snd_seq_dispatch_event(struct snd_seq_event_cell *cell, int atomic, int hop); /* exported to other modules */ int snd_seq_kernel_client_enqueue(int client, struct snd_seq_event *ev, int atomic, int hop); int snd_seq_kernel_client_enqueue_blocking(int client, struct snd_seq_event * ev, struct file *file, int atomic, int hop); int snd_seq_kernel_client_write_poll(int clientid, struct file *file, poll_table *wait); int snd_seq_client_notify_subscription(int client, int port, struct snd_seq_port_subscribe *info, int evtype); extern int seq_client_load[15]; #endif 508c'>soc/codecs/wm8776.c
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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 /sound/soc/codecs/wm8776.c
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 'sound/soc/codecs/wm8776.c')