threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/tty.h>
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#include <linux/module.h>
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#include <linux/kallsyms.h>
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#include <linux/semaphore.h>
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#include <linux/sched.h>
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/* Legacy tty mutex glue */
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/*
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* Getting the big tty mutex.
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*/
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void tty_lock(struct tty_struct *tty)
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{
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if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
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return;
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tty_kref_get(tty);
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mutex_lock(&tty->legacy_mutex);
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}
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EXPORT_SYMBOL(tty_lock);
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int tty_lock_interruptible(struct tty_struct *tty)
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{
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int ret;
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if (WARN(tty->magic != TTY_MAGIC, "L Bad %p\n", tty))
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return -EIO;
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tty_kref_get(tty);
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ret = mutex_lock_interruptible(&tty->legacy_mutex);
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if (ret)
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tty_kref_put(tty);
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return ret;
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}
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void tty_unlock(struct tty_struct *tty)
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{
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if (WARN(tty->magic != TTY_MAGIC, "U Bad %p\n", tty))
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return;
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mutex_unlock(&tty->legacy_mutex);
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tty_kref_put(tty);
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}
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EXPORT_SYMBOL(tty_unlock);
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void tty_lock_slave(struct tty_struct *tty)
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{
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if (tty && tty != tty->link)
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tty_lock(tty);
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}
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void tty_unlock_slave(struct tty_struct *tty)
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{
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if (tty && tty != tty->link)
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tty_unlock(tty);
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}
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void tty_set_lock_subclass(struct tty_struct *tty)
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{
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lockdep_set_subclass(&tty->legacy_mutex, TTY_LOCK_SLAVE);
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}
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