/* * Early serial console for 8250/16550 devices * * (c) Copyright 2004 Hewlett-Packard Development Company, L.P. * Bjorn Helgaas * * 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. * * Based on the 8250.c serial driver, Copyright (C) 2001 Russell King, * and on early_printk.c by Andi Kleen. * * This is for use before the serial driver has initialized, in * particular, before the UARTs have been discovered and named. * Instead of specifying the console device as, e.g., "ttyS0", * we locate the device directly by its MMIO or I/O port address. * * The user can specify the device directly, e.g., * earlycon=uart8250,io,0x3f8,9600n8 * earlycon=uart8250,mmio,0xff5e0000,115200n8 * earlycon=uart8250,mmio32,0xff5e0000,115200n8 * or * console=uart8250,io,0x3f8,9600n8 * console=uart8250,mmio,0xff5e0000,115200n8 * console=uart8250,mmio32,0xff5e0000,115200n8 */ #include #include #include #include #include #include #include #include #include #include static unsigned int __init serial8250_early_in(struct uart_port *port, int offset) { offset <<= port->regshift; switch (port->iotype) { case UPIO_MEM: return readb(port->membase + offset); case UPIO_MEM16: return readw(port->membase + offset); case UPIO_MEM32: return readl(port->membase + offset); case UPIO_MEM32BE: return ioread32be(port->membase + offset); case UPIO_PORT: return inb(port->iobase + offset); default: return 0; } } static void __init serial8250_early_out(struct uart_port *port, int offset, int value) { offset <<= port->regshift; switch (port->iotype) { case UPIO_MEM: writeb(value, port->membase + offset); break; case UPIO_MEM16: writew(value, port->membase + offset); break; case UPIO_MEM32: writel(value, port->membase + offset); break; case UPIO_MEM32BE: iowrite32be(value, port->membase + offset); break; case UPIO_PORT: outb(value, port->iobase + offset); break; } } #define BOTH_EMPTY (UART_LSR_TEMT | UART_LSR_THRE) static void __init serial_putc(struct uart_port *port, int c) { unsigned int status; serial8250_early_out(port, UART_TX, c); for (;;) { status = serial8250_early_in(port, UART_LSR); if ((status & BOTH_EMPTY) == BOTH_EMPTY) break; cpu_relax(); } } static void __init early_serial8250_write(struct console *console, const char *s, unsigned int count) { struct earlycon_device *device = console->data; struct uart_port *port = &device->port; uart_console_write(port, s, count, serial_putc); } static void __init init_port(struct earlycon_device *device) { struct uart_port *port = &device->port; unsigned int divisor; unsigned char c; unsigned int ier; serial8250_early_out(port, UART_LCR, 0x3); /* 8n1 */ ier = serial8250_early_in(port, UART_IER); serial8250_early_out(port, UART_IER, ier & UART_IER_UUE); /* no interrupt */ serial8250_early_out(port, UART_FCR, 0); /* no fifo */ serial8250_early_out(port, UART_MCR, 0x3); /* DTR + RTS */ divisor = DIV_ROUND_CLOSEST(port->uartclk, 16 * device->baud); c = serial8250_early_in(port, UART_LCR); serial8250_early_out(port, UART_LCR, c | UART_LCR_DLAB); serial8250_early_out(port, UART_DLL, divisor & 0xff); serial8250_early_out(port, UART_DLM, (divisor >> 8) & 0xff); serial8250_early_out(port, UART_LCR, c & ~UART_LCR_DLAB); } int __init early_serial8250_setup(struct earlycon_device *device, const char *options) { if (!(device->port.membase || device->port.iobase)) return -ENODEV; if (!device->baud) { struct uart_port *port = &device->port; unsigned int ier; /* assume the device was initialized, only mask interrupts */ ier = serial8250_early_in(port, UART_IER); serial8250_early_out(port, UART_IER, ier & UART_IER_UUE); } else init_port(device); device->con->write = early_serial8250_write; return 0; } EARLYCON_DECLARE(uart8250, early_serial8250_setup); EARLYCON_DECLARE(uart, early_serial8250_setup); OF_EARLYCON_DECLARE(ns16550, "ns16550", early_serial8250_setup); OF_EARLYCON_DECLARE(ns16550a, "ns16550a", early_serial8250_setup); OF_EARLYCON_DECLARE(uart, "nvidia,tegra20-uart", early_serial8250_setup); OF_EARLYCON_DECLARE(uart, "snps,dw-apb-uart", early_serial8250_setup); #ifdef CONFIG_SERIAL_8250_OMAP static int __init early_omap8250_setup(struct earlycon_device *device, const char *options) { struct uart_port *port = &device->port; if (!(device->port.membase || device->port.iobase)) return -ENODEV; port->regshift = 2; device->con->write = early_serial8250_write; return 0; } OF_EARLYCON_DECLARE(omap8250, "ti,omap2-uart", early_omap8250_setup); OF_EARLYCON_DECLARE(omap8250, "ti,omap3-uart", early_omap8250_setup); OF_EARLYCON_DECLARE(omap8250, "ti,omap4-uart", early_omap8250_setup); #endif <jkosina@suse.cz>2017-01-31 12:59:32 +0100 commit7a7b5df84b6b4e5d599c7289526eed96541a0654 (patch) treecf7514c7ddf4410fe37ca9099a2785e1cf08fa7d /net/ceph/osd_client.c parent877a021e08ccb6434718c0cc781fdf943c884cc0 (diff)
HID: cp2112: fix sleep-while-atomic
A recent commit fixing DMA-buffers on stack added a shared transfer buffer protected by a spinlock. This is broken as the USB HID request callbacks can sleep. Fix this up by replacing the spinlock with a mutex. Fixes: 1ffb3c40ffb5 ("HID: cp2112: make transfer buffers DMA capable") Cc: stable <stable@vger.kernel.org> # 4.9 Signed-off-by: Johan Hovold <johan@kernel.org> Reviewed-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
Diffstat (limited to 'net/ceph/osd_client.c')