Commit 5c35dc00 authored by Namhyung Kim's avatar Namhyung Kim Committed by Greg Kroah-Hartman

pstore: Convert console write to use ->write_buf

[ Upstream commit 70ad35db ]

Maybe I'm missing something, but I don't know why it needs to copy the
input buffer to psinfo->buf and then write.  Instead we can write the
input buffer directly.  The only implementation that supports console
message (i.e. ramoops) already does it for ftrace messages.

For the upcoming virtio backend driver, it needs to protect psinfo->buf
overwritten from console messages.  If it could use ->write_buf method
instead of ->write, the problem will be solved easily.

Cc: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: 's avatarNamhyung Kim <namhyung@kernel.org>
Signed-off-by: 's avatarKees Cook <keescook@chromium.org>
Signed-off-by: 's avatarSasha Levin <sashal@kernel.org>
parent 1b5620ca
......@@ -584,8 +584,8 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c)
} else {
spin_lock_irqsave(&psinfo->buf_lock, flags);
}
memcpy(psinfo->buf, s, c);
psinfo->write(PSTORE_TYPE_CONSOLE, 0, &id, 0, 0, 0, c, psinfo);
psinfo->write_buf(PSTORE_TYPE_CONSOLE, 0, &id, 0,
s, 0, c, psinfo);
spin_unlock_irqrestore(&psinfo->buf_lock, flags);
s += c;
c = e - s;
......
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