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nfc_llc_register() calls pass a string literal as the 'name' parameter. So kstrdup_const() can be used instead of kfree() to avoid a memory allocation in such cases. Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Signed-off-by: Paolo Abeni <pabeni@redhat.com>
153 lines
2.9 KiB
C
153 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Link Layer Control manager
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*
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* Copyright (C) 2012 Intel Corporation. All rights reserved.
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*/
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#include <net/nfc/llc.h>
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#include "llc.h"
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static LIST_HEAD(llc_engines);
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int __init nfc_llc_init(void)
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{
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int r;
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r = nfc_llc_nop_register();
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if (r)
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goto exit;
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r = nfc_llc_shdlc_register();
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if (r)
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goto exit;
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return 0;
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exit:
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nfc_llc_exit();
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return r;
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}
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static void nfc_llc_del_engine(struct nfc_llc_engine *llc_engine)
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{
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list_del(&llc_engine->entry);
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kfree_const(llc_engine->name);
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kfree(llc_engine);
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}
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void nfc_llc_exit(void)
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{
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struct nfc_llc_engine *llc_engine, *n;
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list_for_each_entry_safe(llc_engine, n, &llc_engines, entry)
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nfc_llc_del_engine(llc_engine);
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}
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int nfc_llc_register(const char *name, const struct nfc_llc_ops *ops)
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{
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struct nfc_llc_engine *llc_engine;
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llc_engine = kzalloc(sizeof(struct nfc_llc_engine), GFP_KERNEL);
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if (llc_engine == NULL)
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return -ENOMEM;
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llc_engine->name = kstrdup_const(name, GFP_KERNEL);
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if (llc_engine->name == NULL) {
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kfree(llc_engine);
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return -ENOMEM;
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}
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llc_engine->ops = ops;
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INIT_LIST_HEAD(&llc_engine->entry);
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list_add_tail(&llc_engine->entry, &llc_engines);
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return 0;
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}
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static struct nfc_llc_engine *nfc_llc_name_to_engine(const char *name)
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{
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struct nfc_llc_engine *llc_engine;
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list_for_each_entry(llc_engine, &llc_engines, entry) {
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if (strcmp(llc_engine->name, name) == 0)
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return llc_engine;
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}
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return NULL;
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}
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void nfc_llc_unregister(const char *name)
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{
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struct nfc_llc_engine *llc_engine;
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llc_engine = nfc_llc_name_to_engine(name);
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if (llc_engine == NULL)
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return;
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nfc_llc_del_engine(llc_engine);
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}
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struct nfc_llc *nfc_llc_allocate(const char *name, struct nfc_hci_dev *hdev,
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xmit_to_drv_t xmit_to_drv,
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rcv_to_hci_t rcv_to_hci, int tx_headroom,
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int tx_tailroom, llc_failure_t llc_failure)
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{
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struct nfc_llc_engine *llc_engine;
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struct nfc_llc *llc;
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llc_engine = nfc_llc_name_to_engine(name);
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if (llc_engine == NULL)
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return NULL;
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llc = kzalloc(sizeof(struct nfc_llc), GFP_KERNEL);
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if (llc == NULL)
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return NULL;
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llc->data = llc_engine->ops->init(hdev, xmit_to_drv, rcv_to_hci,
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tx_headroom, tx_tailroom,
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&llc->rx_headroom, &llc->rx_tailroom,
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llc_failure);
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if (llc->data == NULL) {
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kfree(llc);
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return NULL;
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}
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llc->ops = llc_engine->ops;
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return llc;
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}
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void nfc_llc_free(struct nfc_llc *llc)
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{
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llc->ops->deinit(llc);
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kfree(llc);
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}
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int nfc_llc_start(struct nfc_llc *llc)
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{
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return llc->ops->start(llc);
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}
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EXPORT_SYMBOL(nfc_llc_start);
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int nfc_llc_stop(struct nfc_llc *llc)
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{
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return llc->ops->stop(llc);
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}
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EXPORT_SYMBOL(nfc_llc_stop);
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void nfc_llc_rcv_from_drv(struct nfc_llc *llc, struct sk_buff *skb)
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{
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llc->ops->rcv_from_drv(llc, skb);
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}
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int nfc_llc_xmit_from_hci(struct nfc_llc *llc, struct sk_buff *skb)
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{
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return llc->ops->xmit_from_hci(llc, skb);
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}
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void *nfc_llc_get_data(struct nfc_llc *llc)
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{
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return llc->data;
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}
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