add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/net/xfrm/xfrm_ipcomp.c
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@@ -20,6 +20,7 @@
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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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@@ -36,6 +37,7 @@
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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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43
 
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@@ -45,12 +47,15 @@
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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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-	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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+	u8 *scratch;
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+	struct crypto_comp *tfm;
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+	int err, 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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..
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@@ -103,7 +108,7 @@
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 	err = 0;
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 out:
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-	put_cpu();
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+	local_unlock(ipcomp_scratches_lock);
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 	return err;
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 }
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..
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@@ -146,6 +151,8 @@
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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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@@ -158,12 +165,14 @@
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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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 }