linux-kernel - [PATCH 1/3] mtd: devices: m25p80: Simplify m25p80

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Date:   Sun, 31 Mar 2019 21:49:36 -0700
From:   Andrey Smirnov <andrew.smirnov@...il.com>
To:     linux-mtd@...ts.infradead.org
Cc:     Andrey Smirnov <andrew.smirnov@...il.com>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...tlin.com>,
        Marek Vasut <marek.vasut@...il.com>,
        Chris Healy <cphealy@...il.com>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] mtd: devices: m25p80: Simplify m25p80_read()

Spi_nor_read() already has an appropriate loop around .read() callback
to handle the case when not all of the data requested was written in a
signle ->read() call. Drop extra code doing the same thing in
m25p80_read().

Signed-off-by: Andrey Smirnov <andrew.smirnov@...il.com>
Cc: Brian Norris <computersforpeace@...il.com>
Cc: Boris Brezillon <boris.brezillon@...tlin.com>
Cc: Marek Vasut <marek.vasut@...il.com>
Cc: Chris Healy <cphealy@...il.com>
Cc: linux-mtd@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/mtd/devices/m25p80.c | 22 +++++++---------------
 1 file changed, 7 insertions(+), 15 deletions(-)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index 651bab6d4e31..114f8ccea85b 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -125,7 +125,6 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 				   SPI_MEM_OP_ADDR(nor->addr_width, from, 1),
 				   SPI_MEM_OP_DUMMY(nor->read_dummy, 1),
 				   SPI_MEM_OP_DATA_IN(len, buf, 1));
-	size_t remaining = len;
 	int ret;
 
 	/* get transfer protocols. */
@@ -137,22 +136,15 @@ static ssize_t m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
 	/* convert the dummy cycles to the number of bytes */
 	op.dummy.nbytes = (nor->read_dummy * op.dummy.buswidth) / 8;
 
-	while (remaining) {
-		op.data.nbytes = remaining < UINT_MAX ? remaining : UINT_MAX;
-		ret = spi_mem_adjust_op_size(flash->spimem, &op);
-		if (ret)
-			return ret;
-
-		ret = spi_mem_exec_op(flash->spimem, &op);
-		if (ret)
-			return ret;
+	ret = spi_mem_adjust_op_size(flash->spimem, &op);
+	if (ret)
+		return ret;
 
-		op.addr.val += op.data.nbytes;
-		remaining -= op.data.nbytes;
-		op.data.buf.in += op.data.nbytes;
-	}
+	ret = spi_mem_exec_op(flash->spimem, &op);
+	if (ret)
+		return ret;
 
-	return len;
+	return op.data.nbytes;
 }
 
 /*
-- 
2.20.1