Revision 694718d8ad2f0b11d7376f8aa32b1befff6e5966 authored by Rafał Miłecki on 17 October 2011, 14:59:25 UTC, committed by John W. Linville on 07 November 2011, 18:19:12 UTC
This fixes PHY transmission errors reported on some LP-PHY and HT-PHY cards. For LP-PHY they were quite rare and not really noticable. On HT-PHY they were critical, OFDM rates were not available at all. Signed-off-by: Rafał Miłecki <zajec5@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
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mmu_context.c
/* Copyright (C) 2009 Red Hat, Inc.
*
* See ../COPYING for licensing terms.
*/
#include <linux/mm.h>
#include <linux/mmu_context.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <asm/mmu_context.h>
/*
* use_mm
* Makes the calling kernel thread take on the specified
* mm context.
* Called by the retry thread execute retries within the
* iocb issuer's mm context, so that copy_from/to_user
* operations work seamlessly for aio.
* (Note: this routine is intended to be called only
* from a kernel thread context)
*/
void use_mm(struct mm_struct *mm)
{
struct mm_struct *active_mm;
struct task_struct *tsk = current;
task_lock(tsk);
active_mm = tsk->active_mm;
if (active_mm != mm) {
atomic_inc(&mm->mm_count);
tsk->active_mm = mm;
}
tsk->mm = mm;
switch_mm(active_mm, mm, tsk);
task_unlock(tsk);
if (active_mm != mm)
mmdrop(active_mm);
}
EXPORT_SYMBOL_GPL(use_mm);
/*
* unuse_mm
* Reverses the effect of use_mm, i.e. releases the
* specified mm context which was earlier taken on
* by the calling kernel thread
* (Note: this routine is intended to be called only
* from a kernel thread context)
*/
void unuse_mm(struct mm_struct *mm)
{
struct task_struct *tsk = current;
task_lock(tsk);
sync_mm_rss(tsk, mm);
tsk->mm = NULL;
/* active_mm is still 'mm' */
enter_lazy_tlb(mm, tsk);
task_unlock(tsk);
}
EXPORT_SYMBOL_GPL(unuse_mm);
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