/* * digi00x.c - a part of driver for Digidesign Digi 002/003 family * * Copyright (c) 2014-2015 Takashi Sakamoto * * Licensed under the terms of the GNU General Public License, version 2. */ #include "digi00x.h" MODULE_DESCRIPTION("Digidesign Digi 002/003 family Driver"); MODULE_AUTHOR("Takashi Sakamoto "); MODULE_LICENSE("GPL v2"); #define VENDOR_DIGIDESIGN 0x00a07e #define MODEL_DIGI00X 0x000002 static int name_card(struct snd_dg00x *dg00x) { struct fw_device *fw_dev = fw_parent_device(dg00x->unit); char name[32] = {0}; char *model; int err; err = fw_csr_string(dg00x->unit->directory, CSR_MODEL, name, sizeof(name)); if (err < 0) return err; model = skip_spaces(name); strcpy(dg00x->card->driver, "Digi00x"); strcpy(dg00x->card->shortname, model); strcpy(dg00x->card->mixername, model); snprintf(dg00x->card->longname, sizeof(dg00x->card->longname), "Digidesign %s, GUID %08x%08x at %s, S%d", model, fw_dev->config_rom[3], fw_dev->config_rom[4], dev_name(&dg00x->unit->device), 100 << fw_dev->max_speed); return 0; } static void dg00x_free(struct snd_dg00x *dg00x) { snd_dg00x_stream_destroy_duplex(dg00x); snd_dg00x_transaction_unregister(dg00x); fw_unit_put(dg00x->unit); mutex_destroy(&dg00x->mutex); } static void dg00x_card_free(struct snd_card *card) { dg00x_free(card->private_data); } static void do_registration(struct work_struct *work) { struct snd_dg00x *dg00x = container_of(work, struct snd_dg00x, dwork.work); int err; if (dg00x->registered) return; err = snd_card_new(&dg00x->unit->device, -1, NULL, THIS_MODULE, 0, &dg00x->card); if (err < 0) return; err = name_card(dg00x); if (err < 0) goto error; err = snd_dg00x_stream_init_duplex(dg00x); if (err < 0) goto error; snd_dg00x_proc_init(dg00x); err = snd_dg00x_create_pcm_devices(dg00x); if (err < 0) goto error; err = snd_dg00x_create_midi_devices(dg00x); if (err < 0) goto error; err = snd_dg00x_create_hwdep_device(dg00x); if (err < 0) goto error; err = snd_dg00x_transaction_register(dg00x); if (err < 0) goto error; err = snd_card_register(dg00x->card); if (err < 0) goto error; dg00x->card->private_free = dg00x_card_free; dg00x->card->private_data = dg00x; dg00x->registered = true; return; error: snd_dg00x_transaction_unregister(dg00x); snd_dg00x_stream_destroy_duplex(dg00x); snd_card_free(dg00x->card); dev_info(&dg00x->unit->device, "Sound card registration failed: %d\n", err); } static int snd_dg00x_probe(struct fw_unit *unit, const struct ieee1394_device_id *entry) { struct snd_dg00x *dg00x; /* Allocate this independent of sound card instance. */ dg00x = kzalloc(sizeof(struct snd_dg00x), GFP_KERNEL); if (dg00x == NULL) return -ENOMEM; dg00x->unit = fw_unit_get(unit); dev_set_drvdata(&unit->device, dg00x); mutex_init(&dg00x->mutex); spin_lock_init(&dg00x->lock); init_waitqueue_head(&dg00x->hwdep_wait); /* Allocate and register this sound card later. */ INIT_DEFERRABLE_WORK(&dg00x->dwork, do_registration); snd_fw_schedule_registration(unit, &dg00x->dwork); return 0; } static void snd_dg00x_update(struct fw_unit *unit) { struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device); /* Postpone a workqueue for deferred registration. */ if (!dg00x->registered) snd_fw_schedule_registration(unit, &dg00x->dwork); snd_dg00x_transaction_reregister(dg00x); /* * After registration, userspace can start packet streaming, then this * code block works fine. */ if (dg00x->registered) { mutex_lock(&dg00x->mutex); snd_dg00x_stream_update_duplex(dg00x); mutex_unlock(&dg00x->mutex); } } static void snd_dg00x_remove(struct fw_unit *unit) { struct snd_dg00x *dg00x = dev_get_drvdata(&unit->device); /* * Confirm to stop the work for registration before the sound card is * going to be released. The work is not scheduled again because bus * reset handler is not called anymore. */ cancel_delayed_work_sync(&dg00x->dwork); if (dg00x->registered) { /* No need to wait for releasing card object in this context. */ snd_card_free_when_closed(dg00x->card); } else { /* Don't forget this case. */ dg00x_free(dg00x); } } static const struct ieee1394_device_id snd_dg00x_id_table[] = { /* Both of 002/003 use the same ID. */ { .match_flags = IEEE1394_MATCH_VENDOR_ID | IEEE1394_MATCH_MODEL_ID, .vendor_id = VENDOR_DIGIDESIGN, .model_id = MODEL_DIGI00X, }, {} }; MODULE_DEVICE_TABLE(ieee1394, snd_dg00x_id_table); static struct fw_driver dg00x_driver = { .driver = { .owner = THIS_MODULE, .name = "snd-firewire-digi00x", .bus = &fw_bus_type, }, .probe = snd_dg00x_probe, .update = snd_dg00x_update, .remove = snd_dg00x_remove, .id_table = snd_dg00x_id_table, }; static int __init snd_dg00x_init(void) { return driver_register(&dg00x_driver.driver); } static void __exit snd_dg00x_exit(void) { driver_unregister(&dg00x_driver.driver); } module_init(snd_dg00x_init); module_exit(snd_dg00x_exit); 9cf33d34bb6751c874a9c00980552fe508c (patch) treece6547ef2987fbb289fa28f03536328a42781651 /net/nfc/hci/command.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 'net/nfc/hci/command.c')