/* * USB Wishbone-Serial adapter driver * * Copyright (C) 2013 Wesley W. Terpstra * Copyright (C) 2013 GSI Helmholtz Centre for Heavy Ion Research GmbH * * 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. */ #include #include #include #include #include #include #define GSI_VENDOR_OPENCLOSE 0xB0 static const struct usb_device_id id_table[] = { { USB_DEVICE_AND_INTERFACE_INFO(0x1D50, 0x6062, 0xFF, 0xFF, 0xFF) }, { }, }; MODULE_DEVICE_TABLE(usb, id_table); /* * Etherbone must be told that a new stream has begun before data arrives. * This is necessary to restart the negotiation of Wishbone bus parameters. * Similarly, when the stream ends, Etherbone must be told so that the cycle * line can be driven low in the case that userspace failed to do so. */ static int usb_gsi_openclose(struct usb_serial_port *port, int value) { struct usb_device *dev = port->serial->dev; return usb_control_msg( dev, usb_sndctrlpipe(dev, 0), /* Send to EP0OUT */ GSI_VENDOR_OPENCLOSE, USB_DIR_OUT|USB_TYPE_VENDOR|USB_RECIP_INTERFACE, value, /* wValue = device is open(1) or closed(0) */ port->serial->interface->cur_altsetting->desc.bInterfaceNumber, NULL, 0, /* There is no data stage */ 5000); /* Timeout till operation fails */ } static int wishbone_serial_open(struct tty_struct *tty, struct usb_serial_port *port) { int retval; retval = usb_gsi_openclose(port, 1); if (retval) { dev_err(&port->serial->dev->dev, "Could not mark device as open (%d)\n", retval); return retval; } retval = usb_serial_generic_open(tty, port); if (retval) usb_gsi_openclose(port, 0); return retval; } static void wishbone_serial_close(struct usb_serial_port *port) { usb_serial_generic_close(port); usb_gsi_openclose(port, 0); } static struct usb_serial_driver wishbone_serial_device = { .driver = { .owner = THIS_MODULE, .name = "wishbone_serial", }, .id_table = id_table, .num_ports = 1, .open = &wishbone_serial_open, .close = &wishbone_serial_close, }; static struct usb_serial_driver * const serial_drivers[] = { &wishbone_serial_device, NULL }; module_usb_serial_driver(serial_drivers, id_table); MODULE_AUTHOR("Wesley W. Terpstra "); MODULE_DESCRIPTION("USB Wishbone-Serial adapter"); MODULE_LICENSE("GPL"); lass='txt' type='search' size='10' name='q' value=''/>
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authorSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-30 19:27:10 -0500
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2017-01-31 09:13:49 -0500
commit79c6f448c8b79c321e4a1f31f98194e4f6b6cae7 (patch)
tree370efda701f03cccf21e02bb1fdd3b852547d75c /sound/aoa
parent0c744ea4f77d72b3dcebb7a8f2684633ec79be88 (diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'sound/aoa')