[U-Boot] [PATCH 1/1] mtd: nand-base: fix bug writing 1 byte less than page size

[Hector Palacios]

nand_do_write_ops() determines if it is writing a partial page with the
formula:
	if (column || (writelen < mtd->writesize - 1))

When 'writelen' is exactly 1 byte less than the NAND page size the formula
equates to zero, so the code doesn't process it as a partial write, although
it should.
As a consequence the function remains in the while(1) loop with 'writelen'
becoming 0xffffffff and iterating until the watchdog timeout triggers.

To reproduce the issue on a NAND with 2K page (0x800):
	=> nand erase.part <partition>
	=> nand write $loadaddr <partition> 7ff

Signed-off-by: Hector Palacios <hector.palacios at digi.com>

https://jira.digi.com/browse/DUB-619
---
 drivers/mtd/nand/nand_base.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index c0e381ad2d15..cb15bb21e2f0 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c
@@ -2524,7 +2524,7 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to,
 
 		WATCHDOG_RESET();
 		/* Partial page write? */
-		if (unlikely(column || writelen < (mtd->writesize - 1))) {
+		if (unlikely(column || writelen < mtd->writesize)) {
 			cached = 0;
 			bytes = min_t(int, bytes - column, (int) writelen);
 			chip->pagebuf = -1;