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From:   Claire Chang <tientzu@chromium.org>
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Subject: [PATCH v10 02/12] swiotlb: Refactor swiotlb_create_debugfs
Date:   Tue, 15 Jun 2021 21:27:01 +0800
Message-Id: <20210615132711.553451-3-tientzu@chromium.org>
In-Reply-To: <20210615132711.553451-1-tientzu@chromium.org>
References: <20210615132711.553451-1-tientzu@chromium.org>
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Split the debugfs creation to make the code reusable for supporting
different bounce buffer pools.

Signed-off-by: Claire Chang <tientzu@chromium.org>
---
 kernel/dma/swiotlb.c | 21 ++++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index c64298e416c8..97c6ad50fdc2 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -661,19 +661,26 @@ bool is_swiotlb_active(void)
 EXPORT_SYMBOL_GPL(is_swiotlb_active);
 
 #ifdef CONFIG_DEBUG_FS
+static struct dentry *debugfs_dir;
 
-static int __init swiotlb_create_debugfs(void)
+static void swiotlb_create_debugfs_files(struct io_tlb_mem *mem)
 {
-	struct io_tlb_mem *mem = io_tlb_default_mem;
-
-	if (!mem)
-		return 0;
-	mem->debugfs = debugfs_create_dir("swiotlb", NULL);
 	debugfs_create_ulong("io_tlb_nslabs", 0400, mem->debugfs, &mem->nslabs);
 	debugfs_create_ulong("io_tlb_used", 0400, mem->debugfs, &mem->used);
+}
+
+static int __init swiotlb_create_default_debugfs(void)
+{
+	struct io_tlb_mem *mem = io_tlb_default_mem;
+
+	debugfs_dir = debugfs_create_dir("swiotlb", NULL);
+	if (mem) {
+		mem->debugfs = debugfs_dir;
+		swiotlb_create_debugfs_files(mem);
+	}
 	return 0;
 }
 
-late_initcall(swiotlb_create_debugfs);
+late_initcall(swiotlb_create_default_debugfs);
 
 #endif
-- 
2.32.0.272.g935e593368-goog