linux-kernel - [PATCHv4 07/12] dmapool: rearrange page alloc failure handling

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Date:   Thu, 26 Jan 2023 13:51:20 -0800
From:   Keith Busch <kbusch@...a.com>
To:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        <willy@...radead.org>, <hch@....de>, <tonyb@...ernetics.com>,
        <akpm@...ux-foundation.org>
CC:     <kernel-team@...a.com>, Keith Busch <kbusch@...nel.org>
Subject: [PATCHv4 07/12] dmapool: rearrange page alloc failure handling

From: Keith Busch <kbusch@...nel.org>

Handle the error in a condition so the good path can be in the normal
flow.

Signed-off-by: Keith Busch <kbusch@...nel.org>
Reviewed-by: Christoph Hellwig <hch@....de>
---
 mm/dmapool.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/mm/dmapool.c b/mm/dmapool.c
index 30b069e999968..900f2afa363a9 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -292,17 +292,19 @@ static struct dma_page *pool_alloc_page(struct dma_pool *pool, gfp_t mem_flags)
 	page = kmalloc(sizeof(*page), mem_flags);
 	if (!page)
 		return NULL;
+
 	page->vaddr = dma_alloc_coherent(pool->dev, pool->allocation,
 					 &page->dma, mem_flags);
-	if (page->vaddr) {
-		pool_init_page(pool, page);
-		pool_initialise_page(pool, page);
-		page->in_use = 0;
-		page->offset = 0;
-	} else {
+	if (!page->vaddr) {
 		kfree(page);
-		page = NULL;
+		return NULL;
 	}
+
+	pool_init_page(pool, page);
+	pool_initialise_page(pool, page);
+	page->in_use = 0;
+	page->offset = 0;
+
 	return page;
 }
 
-- 
2.30.2