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| author | Evan Green <evgreen@chromium.org> | 2021-10-29 12:24:22 -0700 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-11-24 13:50:18 +0100 |
| commit | 88a5045f176b78c33a269a30a7b146e99c550bd9 (patch) | |
| tree | e78632648e4ddf27ff86e44116cf764ad9b400ed /kernel/power | |
| parent | cefcf24b4d351daf70ecd945324e200d3736821e (diff) | |
| download | linux-88a5045f176b78c33a269a30a7b146e99c550bd9.tar.bz2 | |
PM: hibernate: Fix snapshot partial write lengths
snapshot_write() is inappropriately limiting the amount of data that can
be written in cases where a partial page has already been written. For
example, one would expect to be able to write 1 byte, then 4095 bytes to
the snapshot device, and have both of those complete fully (since now
we're aligned to a page again). But what ends up happening is we write 1
byte, then 4094/4095 bytes complete successfully.
The reason is that simple_write_to_buffer()'s second argument is the
total size of the buffer, not the size of the buffer minus the offset.
Since simple_write_to_buffer() accounts for the offset in its
implementation, snapshot_write() can just pass the full page size
directly down.
Signed-off-by: Evan Green <evgreen@chromium.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'kernel/power')
| -rw-r--r-- | kernel/power/user.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/power/user.c b/kernel/power/user.c index 740723bb3885..ad241b4ff64c 100644 --- a/kernel/power/user.c +++ b/kernel/power/user.c @@ -177,7 +177,7 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf, if (res <= 0) goto unlock; } else { - res = PAGE_SIZE - pg_offp; + res = PAGE_SIZE; } if (!data_of(data->handle)) { |