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From: Krzysztof Kozlowski <krzk@kernel.org>
To: Kyungmin Park <kyungmin.park@samsung.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Subject: [RFT] mtd: onenand: samsung: Fix iomem access with regular memcpy
Date: Fri,  3 Jan 2020 17:41:58 +0100	[thread overview]
Message-ID: <20200103164158.4265-1-krzk@kernel.org> (raw)

The __iomem memory should be copied with memcpy_fromio.  This fixes
Sparse warnings like:

    drivers/mtd/nand/onenand/samsung_mtd.c:678:40: warning: incorrect type in argument 2 (different address spaces)
    drivers/mtd/nand/onenand/samsung_mtd.c:678:40:    expected void const *from
    drivers/mtd/nand/onenand/samsung_mtd.c:678:40:    got void [noderef] <asn:2> *[assigned] p
    drivers/mtd/nand/onenand/samsung_mtd.c:679:19: warning: incorrect type in assignment (different address spaces)
    drivers/mtd/nand/onenand/samsung_mtd.c:679:19:    expected void [noderef] <asn:2> *[assigned] p
    drivers/mtd/nand/onenand/samsung_mtd.c:679:19:    got unsigned char *

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---

Not tested

---
 drivers/mtd/nand/onenand/samsung_mtd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/onenand/samsung_mtd.c b/drivers/mtd/nand/onenand/samsung_mtd.c
index 4a78c0aed6dd..01899f8bdfa7 100644
--- a/drivers/mtd/nand/onenand/samsung_mtd.c
+++ b/drivers/mtd/nand/onenand/samsung_mtd.c
@@ -675,12 +675,12 @@ static int s5pc110_read_bufferram(struct mtd_info *mtd, int area,
 normal:
 	if (count != mtd->writesize) {
 		/* Copy the bufferram to memory to prevent unaligned access */
-		memcpy(this->page_buf, p, mtd->writesize);
-		p = this->page_buf + offset;
+		memcpy_fromio(this->page_buf, p, mtd->writesize);
+		memcpy(buffer, this->page_buf + offset, count);
+	} else {
+		memcpy_fromio(buffer, p, count);
 	}
 
-	memcpy(buffer, p, count);
-
 	return 0;
 }
 
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Krzysztof Kozlowski <krzk@kernel.org>
To: Kyungmin Park <kyungmin.park@samsung.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Subject: [RFT] mtd: onenand: samsung: Fix iomem access with regular memcpy
Date: Fri,  3 Jan 2020 17:41:58 +0100	[thread overview]
Message-ID: <20200103164158.4265-1-krzk@kernel.org> (raw)

The __iomem memory should be copied with memcpy_fromio.  This fixes
Sparse warnings like:

    drivers/mtd/nand/onenand/samsung_mtd.c:678:40: warning: incorrect type in argument 2 (different address spaces)
    drivers/mtd/nand/onenand/samsung_mtd.c:678:40:    expected void const *from
    drivers/mtd/nand/onenand/samsung_mtd.c:678:40:    got void [noderef] <asn:2> *[assigned] p
    drivers/mtd/nand/onenand/samsung_mtd.c:679:19: warning: incorrect type in assignment (different address spaces)
    drivers/mtd/nand/onenand/samsung_mtd.c:679:19:    expected void [noderef] <asn:2> *[assigned] p
    drivers/mtd/nand/onenand/samsung_mtd.c:679:19:    got unsigned char *

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---

Not tested

---
 drivers/mtd/nand/onenand/samsung_mtd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/onenand/samsung_mtd.c b/drivers/mtd/nand/onenand/samsung_mtd.c
index 4a78c0aed6dd..01899f8bdfa7 100644
--- a/drivers/mtd/nand/onenand/samsung_mtd.c
+++ b/drivers/mtd/nand/onenand/samsung_mtd.c
@@ -675,12 +675,12 @@ static int s5pc110_read_bufferram(struct mtd_info *mtd, int area,
 normal:
 	if (count != mtd->writesize) {
 		/* Copy the bufferram to memory to prevent unaligned access */
-		memcpy(this->page_buf, p, mtd->writesize);
-		p = this->page_buf + offset;
+		memcpy_fromio(this->page_buf, p, mtd->writesize);
+		memcpy(buffer, this->page_buf + offset, count);
+	} else {
+		memcpy_fromio(buffer, p, count);
 	}
 
-	memcpy(buffer, p, count);
-
 	return 0;
 }
 
-- 
2.17.1


______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/

WARNING: multiple messages have this Message-ID (diff)
From: Krzysztof Kozlowski <krzk@kernel.org>
To: Kyungmin Park <kyungmin.park@samsung.com>,
	Miquel Raynal <miquel.raynal@bootlin.com>,
	Richard Weinberger <richard@nod.at>,
	Vignesh Raghavendra <vigneshr@ti.com>,
	linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-samsung-soc@vger.kernel.org
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Subject: [RFT] mtd: onenand: samsung: Fix iomem access with regular memcpy
Date: Fri,  3 Jan 2020 17:41:58 +0100	[thread overview]
Message-ID: <20200103164158.4265-1-krzk@kernel.org> (raw)

The __iomem memory should be copied with memcpy_fromio.  This fixes
Sparse warnings like:

    drivers/mtd/nand/onenand/samsung_mtd.c:678:40: warning: incorrect type in argument 2 (different address spaces)
    drivers/mtd/nand/onenand/samsung_mtd.c:678:40:    expected void const *from
    drivers/mtd/nand/onenand/samsung_mtd.c:678:40:    got void [noderef] <asn:2> *[assigned] p
    drivers/mtd/nand/onenand/samsung_mtd.c:679:19: warning: incorrect type in assignment (different address spaces)
    drivers/mtd/nand/onenand/samsung_mtd.c:679:19:    expected void [noderef] <asn:2> *[assigned] p
    drivers/mtd/nand/onenand/samsung_mtd.c:679:19:    got unsigned char *

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
---

Not tested

---
 drivers/mtd/nand/onenand/samsung_mtd.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/onenand/samsung_mtd.c b/drivers/mtd/nand/onenand/samsung_mtd.c
index 4a78c0aed6dd..01899f8bdfa7 100644
--- a/drivers/mtd/nand/onenand/samsung_mtd.c
+++ b/drivers/mtd/nand/onenand/samsung_mtd.c
@@ -675,12 +675,12 @@ static int s5pc110_read_bufferram(struct mtd_info *mtd, int area,
 normal:
 	if (count != mtd->writesize) {
 		/* Copy the bufferram to memory to prevent unaligned access */
-		memcpy(this->page_buf, p, mtd->writesize);
-		p = this->page_buf + offset;
+		memcpy_fromio(this->page_buf, p, mtd->writesize);
+		memcpy(buffer, this->page_buf + offset, count);
+	} else {
+		memcpy_fromio(buffer, p, count);
 	}
 
-	memcpy(buffer, p, count);
-
 	return 0;
 }
 
-- 
2.17.1


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2020-01-03 16:42 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-03 16:41 Krzysztof Kozlowski [this message]
2020-01-03 16:41 ` [RFT] mtd: onenand: samsung: Fix iomem access with regular memcpy Krzysztof Kozlowski
2020-01-03 16:41 ` Krzysztof Kozlowski
2020-01-09 19:14 ` Miquel Raynal
2020-01-09 19:14   ` Miquel Raynal
2020-01-09 19:14   ` Miquel Raynal

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