add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/net/xfrm/xfrm_ipcomp.c
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@@ -1,13 +1,9 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  * IP Payload Compression Protocol (IPComp) - RFC3173.
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  *
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  * Copyright (c) 2003 James Morris <jmorris@intercode.com.au>
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  * Copyright (c) 2003-2008 Herbert Xu <herbert@gondor.apana.org.au>
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License as published by the Free
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- * Software Foundation; either version 2 of the License, or (at your option)
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- * any later version.
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  *
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  * Todo:
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  *   - Tunable compression parameters.
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@@ -20,7 +16,6 @@
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 #include <linux/list.h>
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 #include <linux/module.h>
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 #include <linux/mutex.h>
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-#include <linux/locallock.h>
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 #include <linux/percpu.h>
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 #include <linux/slab.h>
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 #include <linux/smp.h>
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@@ -37,7 +32,6 @@
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 static DEFINE_MUTEX(ipcomp_resource_mutex);
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 static void * __percpu *ipcomp_scratches;
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-static DEFINE_LOCAL_IRQ_LOCK(ipcomp_scratches_lock);
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 static int ipcomp_scratch_users;
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 static LIST_HEAD(ipcomp_tfms_list);
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@@ -47,15 +41,12 @@
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 	const int plen = skb->len;
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 	int dlen = IPCOMP_SCRATCH_SIZE;
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 	const u8 *start = skb->data;
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-	u8 *scratch;
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-	struct crypto_comp *tfm;
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-	int err, len;
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+	const int cpu = get_cpu();
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+	u8 *scratch = *per_cpu_ptr(ipcomp_scratches, cpu);
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+	struct crypto_comp *tfm = *per_cpu_ptr(ipcd->tfms, cpu);
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+	int err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
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+	int len;
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-	local_lock(ipcomp_scratches_lock);
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-
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-	scratch = *this_cpu_ptr(ipcomp_scratches);
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-	tfm = *this_cpu_ptr(ipcd->tfms);
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-	err = crypto_comp_decompress(tfm, start, plen, scratch, &dlen);
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 	if (err)
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 		goto out;
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@@ -94,7 +85,7 @@
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 		if (dlen < len)
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 			len = dlen;
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-		frag->page_offset = 0;
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+		skb_frag_off_set(frag, 0);
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 		skb_frag_size_set(frag, len);
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 		memcpy(skb_frag_address(frag), scratch, len);
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@@ -108,7 +99,7 @@
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 	err = 0;
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 out:
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-	local_unlock(ipcomp_scratches_lock);
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+	put_cpu();
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 	return err;
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 }
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@@ -151,8 +142,6 @@
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 	int err;
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 	local_bh_disable();
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-	local_lock(ipcomp_scratches_lock);
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-
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 	scratch = *this_cpu_ptr(ipcomp_scratches);
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 	tfm = *this_cpu_ptr(ipcd->tfms);
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 	err = crypto_comp_compress(tfm, start, plen, scratch, &dlen);
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@@ -165,14 +154,12 @@
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 	}
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 	memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
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-	local_unlock(ipcomp_scratches_lock);
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 	local_bh_enable();
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 	pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
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 	return 0;
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 out:
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-	local_unlock(ipcomp_scratches_lock);
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 	local_bh_enable();
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 	return err;
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 }
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@@ -225,6 +212,7 @@
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 		vfree(*per_cpu_ptr(scratches, i));
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 	free_percpu(scratches);
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+	ipcomp_scratches = NULL;
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 }
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 static void * __percpu *ipcomp_alloc_scratches(void)
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@@ -263,7 +251,7 @@
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 			break;
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 	}
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-	WARN_ON(!pos);
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+	WARN_ON(list_entry_is_head(pos, &ipcomp_tfms_list, list));
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 	if (--pos->users)
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 		return;