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ll_temac_main.c
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Esben Haabendal authored
It is possible that the interrupt handler fires and frees up space in the TX ring in between checking for sufficient TX ring space and stopping the TX queue in temac_start_xmit. If this happens, the queue wake from the interrupt handler will occur before the queue is stopped, causing a lost wakeup and the adapter's transmit hanging. To avoid this, after stopping the queue, check again whether there is sufficient space in the TX ring. If so, wake up the queue again. This is a port of the similar fix in axienet driver, commit 7de44285 ("net: axienet: Fix race condition causing TX hang"). Fixes: 23ecc4bd ("net: ll_temac: fix checksum offload logic") Signed-off-by:
Esben Haabendal <esben@geanix.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
Esben Haabendal authoredIt is possible that the interrupt handler fires and frees up space in the TX ring in between checking for sufficient TX ring space and stopping the TX queue in temac_start_xmit. If this happens, the queue wake from the interrupt handler will occur before the queue is stopped, causing a lost wakeup and the adapter's transmit hanging. To avoid this, after stopping the queue, check again whether there is sufficient space in the TX ring. If so, wake up the queue again. This is a port of the similar fix in axienet driver, commit 7de44285 ("net: axienet: Fix race condition causing TX hang"). Fixes: 23ecc4bd ("net: ll_temac: fix checksum offload logic") Signed-off-by:
Esben Haabendal <esben@geanix.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
gup.c 82.84 KiB
// SPDX-License-Identifier: GPL-2.0-only
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/spinlock.h>
#include <linux/mm.h>
#include <linux/memremap.h>
#include <linux/pagemap.h>
#include <linux/rmap.h>
#include <linux/swap.h>
#include <linux/swapops.h>
#include <linux/sched/signal.h>
#include <linux/rwsem.h>
#include <linux/hugetlb.h>
#include <linux/migrate.h>
#include <linux/mm_inline.h>
#include <linux/sched/mm.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
#include "internal.h"
struct follow_page_context {
struct dev_pagemap *pgmap;
unsigned int page_mask;
};
static void hpage_pincount_add(struct page *page, int refs)
{
VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
VM_BUG_ON_PAGE(page != compound_head(page), page);
atomic_add(refs, compound_pincount_ptr(page));
}
static void hpage_pincount_sub(struct page *page, int refs)
{
VM_BUG_ON_PAGE(!hpage_pincount_available(page), page);
VM_BUG_ON_PAGE(page != compound_head(page), page);
atomic_sub(refs, compound_pincount_ptr(page));
}
/*
* Return the compound head page with ref appropriately incremented,
* or NULL if that failed.
*/
static inline struct page *try_get_compound_head(struct page *page, int refs)
{
struct page *head = compound_head(page);
if (WARN_ON_ONCE(page_ref_count(head) < 0))
return NULL;
if (unlikely(!page_cache_add_speculative(head, refs)))
return NULL;
return head;
}
/*
* try_grab_compound_head() - attempt to elevate a page's refcount, by a
* flags-dependent amount.
*
* "grab" names in this file mean, "look at flags to decide whether to use
* FOLL_PIN or FOLL_GET behavior, when incrementing the page's refcount.
*
* Either FOLL_PIN or FOLL_GET (or neither) must be set, but not both at the
* same time. (That's true throughout the get_user_pages*() and