[PATCH v2] mtd: m25p80: Make the name of mtd_info fixed

[Hou Zhiqiang <b48286@freescale.com>]

To give spi flash layout using "mtdparts=..." in cmdline, we must
give mtd_info a fixed name,because the cmdlinepart's parser will
match the name given in cmdline with the mtd_info.

Now, if use OF node, mtd_info's name will be spi->dev->name. It
consists of spi_master->bus_num, and the spi_master->bus_num maybe
dynamically fetched.
So, give the mtd_info a new fiexd name "name.cs", "name" is name of
spi_device_id and "cs" is chip-select in spi_dev.

Signed-off-by: Hou Zhiqiang <b48286@freescale.com>
---
v2:
 - add check for return value of function kasprintf.
 - whether the spi_master->bus_num is dynamical is determined by spi
   controller driver, and it can't be check in this driver. So, we can
   not initial the mtd_info's name by distinguishing the spi_master
   bus_num dynamically-allocated or not.

 drivers/mtd/devices/m25p80.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index eb558e8..1f494d2 100644
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -1011,8 +1011,12 @@ static int m25p_probe(struct spi_device *spi)
 
 	if (data && data->name)
 		flash->mtd.name = data->name;
-	else
-		flash->mtd.name = dev_name(&spi->dev);
+	else {
+		flash->mtd.name = kasprintf(GFP_KERNEL, "%s.%d",
+				id->name, spi->chip_select);
+		if (!flash->mtd.name)
+			return -ENOMEM;
+	}
 
 	flash->mtd.type = MTD_NORFLASH;
 	flash->mtd.writesize = 1;
-- 
1.8.4.1