linux-kernel - [PATCH] misc: fastrpc: fix incorrect usage of dma_map

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Message-Id: <20210208200401.31100-1-jonathan@marek.ca>
Date:   Mon,  8 Feb 2021 15:04:01 -0500
From:   Jonathan Marek <jonathan@...ek.ca>
To:     linux-arm-msm@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] misc: fastrpc: fix incorrect usage of dma_map_sgtable

dma_map_sgtable() returns 0 on success, which is the opposite of what this
code was doing.

Fixes: 7cd7edb89437 ("misc: fastrpc: fix common struct sg_table related issues")
Signed-off-by: Jonathan Marek <jonathan@...ek.ca>
---
 drivers/misc/fastrpc.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/misc/fastrpc.c b/drivers/misc/fastrpc.c
index 70eb5ed942d0..f12e909034ac 100644
--- a/drivers/misc/fastrpc.c
+++ b/drivers/misc/fastrpc.c
@@ -520,12 +520,13 @@ fastrpc_map_dma_buf(struct dma_buf_attachment *attachment,
 {
 	struct fastrpc_dma_buf_attachment *a = attachment->priv;
 	struct sg_table *table;
+	int ret;
 
 	table = &a->sgt;
 
-	if (!dma_map_sgtable(attachment->dev, table, dir, 0))
-		return ERR_PTR(-ENOMEM);
-
+	ret = dma_map_sgtable(attachment->dev, table, dir, 0);
+	if (ret)
+		table = ERR_PTR(ret);
 	return table;
 }
 
-- 
2.26.1