linux-kernel - [PATCHv3 07/12] dmapool: rearrange page alloc failure handling

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Message-ID: <20230103191551.3254778-8-kbusch@meta.com>
Date:   Tue, 3 Jan 2023 11:15:46 -0800
From:   Keith Busch <kbusch@...a.com>
To:     <linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@....de>
CC:     Tony Battersby <tonyb@...ernetics.com>,
        Kernel Team <kernel-team@...a.com>,
        Keith Busch <kbusch@...nel.org>
Subject: [PATCHv3 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 | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/mm/dmapool.c b/mm/dmapool.c
index 7bd8990e1913d..0a443c8120f62 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -222,17 +222,17 @@ static struct dma_page *pool_alloc_page(struct dma_pool *pool, gfp_t mem_flags)
 		return NULL;
 	page->vaddr = dma_alloc_coherent(pool->dev, pool->allocation,
 					 &page->dma, mem_flags);
-	if (page->vaddr) {
-#ifdef	DMAPOOL_DEBUG
-		memset(page->vaddr, POOL_POISON_FREED, pool->allocation);
-#endif
-		pool_initialise_page(pool, page);
-		page->in_use = 0;
-		page->offset = 0;
-	} else {
+	if (!page->vaddr) {
 		kfree(page);
-		page = NULL;
+		return NULL;
 	}
+#ifdef	DMAPOOL_DEBUG
+	memset(page->vaddr, POOL_POISON_FREED, pool->allocation);
+#endif
+	pool_initialise_page(pool, page);
+	page->in_use = 0;
+	page->offset = 0;
+
 	return page;
 }
 
-- 
2.30.2