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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/lib/sg_pool.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 #include <linux/module.h>
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 #include <linux/scatterlist.h>
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 #include <linux/mempool.h>
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@@ -69,18 +70,27 @@
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 /**
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  * sg_free_table_chained - Free a previously mapped sg table
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  * @table:	The sg table header to use
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- * @first_chunk: was first_chunk not NULL in sg_alloc_table_chained?
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+ * @nents_first_chunk: size of the first_chunk SGL passed to
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+ *		sg_alloc_table_chained
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  *
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  *  Description:
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  *    Free an sg table previously allocated and setup with
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  *    sg_alloc_table_chained().
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  *
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+ *    @nents_first_chunk has to be same with that same parameter passed
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+ *    to sg_alloc_table_chained().
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+ *
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  **/
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-void sg_free_table_chained(struct sg_table *table, bool first_chunk)
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+void sg_free_table_chained(struct sg_table *table,
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+		unsigned nents_first_chunk)
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 {
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-	if (first_chunk && table->orig_nents <= SG_CHUNK_SIZE)
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+	if (table->orig_nents <= nents_first_chunk)
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 		return;
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-	__sg_free_table(table, SG_CHUNK_SIZE, first_chunk, sg_pool_free);
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+
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+	if (nents_first_chunk == 1)
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+		nents_first_chunk = 0;
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+
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+	__sg_free_table(table, SG_CHUNK_SIZE, nents_first_chunk, sg_pool_free);
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 }
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 EXPORT_SYMBOL_GPL(sg_free_table_chained);
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@@ -89,31 +99,41 @@
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  * @table:	The sg table header to use
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  * @nents:	Number of entries in sg list
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  * @first_chunk: first SGL
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+ * @nents_first_chunk: number of the SGL of @first_chunk
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  *
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  *  Description:
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  *    Allocate and chain SGLs in an sg table. If @nents@ is larger than
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- *    SG_CHUNK_SIZE a chained sg table will be setup.
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+ *    @nents_first_chunk a chained sg table will be setup. @first_chunk is
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+ *    ignored if nents_first_chunk <= 1 because user expects the SGL points
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+ *    non-chain SGL.
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  *
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  **/
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 int sg_alloc_table_chained(struct sg_table *table, int nents,
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-		struct scatterlist *first_chunk)
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+		struct scatterlist *first_chunk, unsigned nents_first_chunk)
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 {
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 	int ret;
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 	BUG_ON(!nents);
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-	if (first_chunk) {
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-		if (nents <= SG_CHUNK_SIZE) {
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+	if (first_chunk && nents_first_chunk) {
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+		if (nents <= nents_first_chunk) {
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 			table->nents = table->orig_nents = nents;
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 			sg_init_table(table->sgl, nents);
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 			return 0;
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 		}
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 	}
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+	/* User supposes that the 1st SGL includes real entry */
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+	if (nents_first_chunk <= 1) {
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+		first_chunk = NULL;
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+		nents_first_chunk = 0;
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+	}
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+
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 	ret = __sg_alloc_table(table, nents, SG_CHUNK_SIZE,
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-			       first_chunk, GFP_ATOMIC, sg_pool_alloc);
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+			       first_chunk, nents_first_chunk,
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+			       GFP_ATOMIC, sg_pool_alloc);
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 	if (unlikely(ret))
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-		sg_free_table_chained(table, (bool)first_chunk);
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+		sg_free_table_chained(table, nents_first_chunk);
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 	return ret;
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 }
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 EXPORT_SYMBOL_GPL(sg_alloc_table_chained);
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@@ -148,10 +168,9 @@
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 cleanup_sdb:
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 	for (i = 0; i < SG_MEMPOOL_NR; i++) {
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 		struct sg_pool *sgp = sg_pools + i;
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-		if (sgp->pool)
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-			mempool_destroy(sgp->pool);
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-		if (sgp->slab)
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-			kmem_cache_destroy(sgp->slab);
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+
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+		mempool_destroy(sgp->pool);
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+		kmem_cache_destroy(sgp->slab);
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 	}
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 	return -ENOMEM;