[PATCH 1/5] m25p80: prevent endless loop in erase

[Johannes Stezenbach]

"erase /dev/myflash0 0+1" erased the whole flash,
similar for other value of count if you guessed the
erae block size wrong.

Signed-off-by: Johannes Stezenbach <js at sig21.net>
---
 drivers/nor/m25p80.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/nor/m25p80.c b/drivers/nor/m25p80.c
index 92b07af..a3dfe75 100644
--- a/drivers/nor/m25p80.c
+++ b/drivers/nor/m25p80.c
@@ -235,6 +235,8 @@ static ssize_t m25p80_erase(struct cdev *cdev, size_t count, unsigned long offse
 			if (erase_sector(flash, addr))
 				return -EIO;
 
+			if (len <= flash->erasesize)
+				break;
 			addr += flash->erasesize;
 			len -= flash->erasesize;
 			show_progress(progress++);
-- 
1.7.10