Some xerox_mfp scanners, such as Samsung SCX-4521F, hangs when
their OUT ENDPOINT receives CLEAR HALT command, which is performed
in usb open and close functions of the backend.
The issue seem to be dependant on USB controller and assumingly
happens due to some sort of incompatibility of USB implementation
in the scanner.
Skip sending this command by default and add
SANE_XEROX_USB_HALT_WORKAROUND env variable to execute
CLEAR HALT commands.
This is purely indent commit without any code changes, in
follow-up to 83bbcfe7d5.
Indent command used:
astyle -A8 -U -H -k3 -W3 -o xerox_mfp-{usb,tcp}.c
Proof that code is not changed:
git log -w -p xerox_mfp-{usb,tcp}.c
Some parts of SANE used __FUNCTION__ while other parts used __func__.
Now, __func__ is used consistently throughout the SANE sources. This
fixes all occurrences of the following GCC warning:
warning: ISO C does not support '__FUNCTION__' predefined identifier
Ralph Little