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mtd: devices: fix mchp23k256 read and write 

commit 14f89e088155314d311e4d4dd9f2b4ccaeef92b2 upstream.

Due to the use of sizeof(), command size set for the spi transfer
was wrong. Driver was sending and receiving always 1 byte less
and especially on write, it was hanging.

echo -n -e "\\x1\\x2\\x3\\x4" > /dev/mtd1

And read part too now works as expected.

hexdump -C -n16 /dev/mtd1
00000000  01 02 03 04 ab f3 ad c2  ab e3 f4 36 dd 38 04 15
00000010

Fixes: 4379075a87 ("mtd: mchp23k256: Add support for mchp23lcv1024")
Signed-off-by: Angelo Dureghello <angelo.dureghello@timesys.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Angelo Dureghello 2019-10-30 12:39:57 +01:00 committed by Greg Kroah-Hartman
parent 835d761721
commit acc5e1a86a
1 changed files with 12 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/mtd/devices/mchp23k256.c
View File

@ -64,15 +64,17 @@ static int mchp23k256_write(struct mtd_info *mtd, loff_t to, size_t len,
struct spi_transfer transfer[2] = {};
struct spi_message message;
unsigned char command[MAX_CMD_SIZE];
int ret;
int ret, cmd_len;
spi_message_init(&message);
cmd_len = mchp23k256_cmdsz(flash);
command[0] = MCHP23K256_CMD_WRITE;
mchp23k256_addr2cmd(flash, to, command);
transfer[0].tx_buf = command;
transfer[0].len = mchp23k256_cmdsz(flash);
transfer[0].len = cmd_len;
spi_message_add_tail(&transfer[0], &message);
transfer[1].tx_buf = buf;
@ -88,8 +90,8 @@ static int mchp23k256_write(struct mtd_info *mtd, loff_t to, size_t len,
if (ret)
return ret;
if (retlen && message.actual_length > sizeof(command))
*retlen += message.actual_length - sizeof(command);
if (retlen && message.actual_length > cmd_len)
*retlen += message.actual_length - cmd_len;
return 0;
}
@ -101,16 +103,18 @@ static int mchp23k256_read(struct mtd_info *mtd, loff_t from, size_t len,
struct spi_transfer transfer[2] = {};
struct spi_message message;
unsigned char command[MAX_CMD_SIZE];
int ret;
int ret, cmd_len;
spi_message_init(&message);
cmd_len = mchp23k256_cmdsz(flash);
memset(&transfer, 0, sizeof(transfer));
command[0] = MCHP23K256_CMD_READ;
mchp23k256_addr2cmd(flash, from, command);
transfer[0].tx_buf = command;
transfer[0].len = mchp23k256_cmdsz(flash);
transfer[0].len = cmd_len;
spi_message_add_tail(&transfer[0], &message);
transfer[1].rx_buf = buf;
@ -126,8 +130,8 @@ static int mchp23k256_read(struct mtd_info *mtd, loff_t from, size_t len,
if (ret)
return ret;
if (retlen && message.actual_length > sizeof(command))
*retlen += message.actual_length - sizeof(command);
if (retlen && message.actual_length > cmd_len)
*retlen += message.actual_length - cmd_len;
return 0;
}