Change in flashrom[master]: WIP: linux_mtd: Disable buffering on the mtd device

[Douglas Anderson (Code Review)]

Douglas Anderson has uploaded this change for review. ( https://review.coreboot.org/c/flashrom/+/50155 )

Change subject: WIP: linux_mtd: Disable buffering on the mtd device
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WIP: linux_mtd: Disable buffering on the mtd device

We open the device node for the MTD device with this:
  dev_fp = fopen(dev_path, "r+")

In C fopen() is allowed to provide _buffered_ access to the file.
That means that the standard library is allowed to read ahead and/or
return cached data.  That's really not what we want for something like
this.  Let's turn it off.

This fixes a problem where flashrom would sometimes fail to "verify"
that it erased the flash.  The error message would look something like
this:

Erasing and writing flash chip... FAILED at 0x0000e220! Expected=0xff, Found=0xe9, failed byte count from 0x0000e200-0x0000e2ff: 0xdc
 failed byte count from 0x0000e000-0x0000efff: 0xffffffff
 ERASE_FAILED
FAILED!
Uh oh. Erase/write failed. Checking if anything changed.

After the failure I could read the flash device with a new invocation
of flashrom and I would see that, indeed, the erase had worked.

Tracing in the kernel showed that when the failure happened we saw a
pattern that looked like this:
* Read 0x0b00 bytes starting at 0x0000d000
* Read 0x1000 bytes starting at 0x0000db00
* Erase 0x1000 bytes starting at 0x0000e000

...and then there was _not_ a read after the erase.  It can be assumed
that, since userspace had already read 0xdb00 - 0xeaff that it was
looking at old buffered data after the erase.

BRANCH=trogdor
BUG=b:178822068
TEST=Loop back and forth writing two BIOS files => no errors

Signed-off-by: Douglas Anderson 
Change-Id: I989afd83a33013b2756a0090d6b08245613215c6
---
M linux_mtd.c
1 file changed, 4 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/55/50155/1

diff --git a/linux_mtd.c b/linux_mtd.c
index d2df95e..22702e9 100644
--- a/linux_mtd.c
+++ b/linux_mtd.c
@@ -340,6 +340,10 @@
    	msg_perr("Cannot open file stream for %s\n", dev_path);
    	goto linux_mtd_setup_exit;
    }
+	ret = setvbuf(dev_fp, NULL, _IONBF, 0);
+	if (ret)
+		msg_pwarn("Failed to set MTD device to unbuffered: %d\n", ret);
+
    msg_pinfo("Opened %s successfully\n", dev_path);

ret = 0;