From: Gerhard Sittig <redacted>
Date: Sat, 1 Aug 2020 12:55:20 +0000 (+0200)
Subject: serial: make failed flush() in open() non-fatal, CP2110 flush() return
X-Git-Url: https://sigrok.org/gitweb/?a=commitdiff_plain;h=0dc27cd1dbc961366d14607526e54992078e9d5c;hp=0dc27cd1dbc961366d14607526e54992078e9d5c;p=libsigrok.git

serial: make failed flush() in open() non-fatal, CP2110 flush() return

Commit cb828f1b3e00 introduced an unconditional flush() call in the
open() routine's body, and passed its return value in verbatim form to
open() callers. Some of the transports/cables for serial communication
yield the SR_ERR_NA return value. Consider this a non-fatal condition.

Unbreak the CP2110 HID chip's flush() implementation. Don't expect a
return value of 0 from HID write calls, instead expect to see the number
of written bytes for successful calls.

This was tested with ch9325 (UT-D04), cp2110 (UT-D09) and bu86x.
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