From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/um/kernel/sigio.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 arch/um/kernel/sigio.c (limited to 'arch/um/kernel/sigio.c') diff --git a/arch/um/kernel/sigio.c b/arch/um/kernel/sigio.c new file mode 100644 index 000000000..5085a50c3 --- /dev/null +++ b/arch/um/kernel/sigio.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2002 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) + */ + +#include +#include +#include +#include + +/* Protected by sigio_lock() called from write_sigio_workaround */ +static int sigio_irq_fd = -1; + +static irqreturn_t sigio_interrupt(int irq, void *data) +{ + char c; + + os_read_file(sigio_irq_fd, &c, sizeof(c)); + return IRQ_HANDLED; +} + +int write_sigio_irq(int fd) +{ + int err; + + err = um_request_irq(SIGIO_WRITE_IRQ, fd, IRQ_READ, sigio_interrupt, + 0, "write sigio", NULL); + if (err < 0) { + printk(KERN_ERR "write_sigio_irq : um_request_irq failed, " + "err = %d\n", err); + return -1; + } + sigio_irq_fd = fd; + return 0; +} + +/* These are called from os-Linux/sigio.c to protect its pollfds arrays. */ +static DEFINE_MUTEX(sigio_mutex); + +void sigio_lock(void) +{ + mutex_lock(&sigio_mutex); +} + +void sigio_unlock(void) +{ + mutex_unlock(&sigio_mutex); +} -- cgit v1.2.3