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https://github.com/torvalds/linux
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f2bcc2fa27
push_scqe() uses in_interrupt() to figure out if it is allowed to sleep. The usage of in_interrupt() in drivers is phased out and Linus clearly requested that code which changes behaviour depending on context should either be separated or the context be conveyed in an argument passed by the caller, which usually knows the context. Aside of that in_interrupt() is not correct as it does not catch preempt disabled regions which neither can sleep. ns_send() (the only caller of push_scqe()) has the following callers: - vcc_sendmsg() used as proto_ops::sendmsg is expected to be invoked in preemtible context. -> vcc->dev->ops->send() (ns_send()) - atm_vcc::send via atmdev_ops::send either directly (pointer copied by atm_init_aal34() or atm_init_aal5()) or via atm_send_aal0(). This is invoked by drivers (like br2684, clip, pppoatm, ...) which are called from net_device_ops::ndo_start_xmit with BH disabled. Add atmdev_ops::send_bh which is used by callers from BH context (atm_send_aal*()) and if this callback missing then ::send is used instead. Implement this callback in nicstar and use it to replace in_interrupt(). Cc: Chas Williams <3chas3@gmail.com> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Signed-off-by: Jakub Kicinski <kuba@kernel.org>
95 lines
2.1 KiB
C
95 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* net/atm/raw.c - Raw AAL0 and AAL5 transports */
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/* Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA */
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#define pr_fmt(fmt) KBUILD_MODNAME ":%s: " fmt, __func__
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#include <linux/module.h>
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#include <linux/atmdev.h>
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#include <linux/capability.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include "common.h"
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#include "protocols.h"
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/*
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* SKB == NULL indicates that the link is being closed
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*/
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static void atm_push_raw(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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if (skb) {
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struct sock *sk = sk_atm(vcc);
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skb_queue_tail(&sk->sk_receive_queue, skb);
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sk->sk_data_ready(sk);
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}
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}
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static void atm_pop_raw(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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struct sock *sk = sk_atm(vcc);
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pr_debug("(%d) %d -= %d\n",
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vcc->vci, sk_wmem_alloc_get(sk), ATM_SKB(skb)->acct_truesize);
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WARN_ON(refcount_sub_and_test(ATM_SKB(skb)->acct_truesize, &sk->sk_wmem_alloc));
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dev_kfree_skb_any(skb);
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sk->sk_write_space(sk);
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}
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static int atm_send_aal0(struct atm_vcc *vcc, struct sk_buff *skb)
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{
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/*
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* Note that if vpi/vci are _ANY or _UNSPEC the below will
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* still work
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*/
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if (!capable(CAP_NET_ADMIN) &&
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(((u32 *)skb->data)[0] & (ATM_HDR_VPI_MASK | ATM_HDR_VCI_MASK)) !=
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((vcc->vpi << ATM_HDR_VPI_SHIFT) |
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(vcc->vci << ATM_HDR_VCI_SHIFT))) {
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kfree_skb(skb);
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return -EADDRNOTAVAIL;
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}
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if (vcc->dev->ops->send_bh)
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return vcc->dev->ops->send_bh(vcc, skb);
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return vcc->dev->ops->send(vcc, skb);
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}
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int atm_init_aal0(struct atm_vcc *vcc)
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{
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vcc->push = atm_push_raw;
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vcc->pop = atm_pop_raw;
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vcc->push_oam = NULL;
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vcc->send = atm_send_aal0;
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return 0;
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}
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int atm_init_aal34(struct atm_vcc *vcc)
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{
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vcc->push = atm_push_raw;
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vcc->pop = atm_pop_raw;
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vcc->push_oam = NULL;
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if (vcc->dev->ops->send_bh)
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vcc->send = vcc->dev->ops->send_bh;
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else
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vcc->send = vcc->dev->ops->send;
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return 0;
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}
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int atm_init_aal5(struct atm_vcc *vcc)
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{
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vcc->push = atm_push_raw;
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vcc->pop = atm_pop_raw;
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vcc->push_oam = NULL;
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if (vcc->dev->ops->send_bh)
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vcc->send = vcc->dev->ops->send_bh;
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else
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vcc->send = vcc->dev->ops->send;
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return 0;
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}
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EXPORT_SYMBOL(atm_init_aal5);
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