mtd: nand: r852: correct write_buf loop bounds
The two loops in r852_write_buf() are designed to handle 4-byte-aligned
and then 1-byte-aligned portions, respectively. However, there are two
issues:
(1) The first loop will only terminate if 'len' is a multiple of 4
(2) The second loop will never terminate if it runs at least once
Rewrite these loops as they were probably intended. Compile tested only.
Issues pointed out by Coverity Scan.
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
diff --git a/drivers/mtd/nand/r852.c b/drivers/mtd/nand/r852.c
index 325930d..baea83f 100644
--- a/drivers/mtd/nand/r852.c
+++ b/drivers/mtd/nand/r852.c
@@ -245,7 +245,7 @@
}
/* write DWORD chinks - faster */
- while (len) {
+ while (len >= 4) {
reg = buf[0] | buf[1] << 8 | buf[2] << 16 | buf[3] << 24;
r852_write_reg_dword(dev, R852_DATALINE, reg);
buf += 4;
@@ -254,8 +254,10 @@
}
/* write rest */
- while (len)
+ while (len > 0) {
r852_write_reg(dev, R852_DATALINE, *buf++);
+ len--;
+ }
}
/*