UPSTREAM: 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.
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/50155
Reviewed-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Patrick Rudolph <siro@das-labor.org>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
(cherry picked from commit a2f2f3f5ee1bb9c953f098f019c3ad09657cba38)
BRANCH=trogdor
BUG=b:178822068
TEST=Loop back and forth writing two BIOS files => no errors
Change-Id: I989afd83a33013b2756a0090d6b08245613215c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/2660502
Commit-Queue: Douglas Anderson <dianders@chromium.org>
Commit-Queue: Vadim Bendebury <vbendeb@chromium.org>
Tested-by: Douglas Anderson <dianders@chromium.org>
Auto-Submit: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>
(cherry picked from commit d45c6d041624b799751d33efc7bc48f5f2777e21)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/2675716
Reviewed-by: Douglas Anderson <dianders@chromium.org>
1 file changed
