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authorJiri Slaby <jslaby@suse.cz>2021-05-05 11:19:18 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-05-13 18:29:11 +0200
commitfa7501e57e9bf869cb6718a2699f05fc2807cbf1 (patch)
tree40c54de40b1c5518536b80b11d21f2a776170c11 /arch/xtensa
parent9a33fbf9d23034d7e89849c587b0aed0e4cf794d (diff)
downloadlinux-fa7501e57e9bf869cb6718a2699f05fc2807cbf1.tar.bz2
tty: remove tty_operations::chars_in_buffer for non-buffering
The only user of tty_ops::chars_in_buffer is tty_chars_in_buffer. And it considers tty_ops::chars_in_buffer optional. In case it's NULL, zero is returned. So remove all those chars_in_buffer from tty_ops which return zero. (Zero means such driver doesn't buffer.) Signed-off-by: Jiri Slaby <jslaby@suse.cz> Cc: Richard Henderson <rth@twiddle.net> Acked-by: Max Filippov <jcmvbkbc@gmail.com> # xtensa Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Helge Deller <deller@gmx.de> Cc: Chris Zankel <chris@zankel.net> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Christian Borntraeger <borntraeger@de.ibm.com> Link: https://lore.kernel.org/r/20210505091928.22010-26-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/xtensa')
-rw-r--r--arch/xtensa/platforms/iss/console.c7
1 files changed, 0 insertions, 7 deletions
diff --git a/arch/xtensa/platforms/iss/console.c b/arch/xtensa/platforms/iss/console.c
index 98ac3a7fdb0a..21184488c277 100644
--- a/arch/xtensa/platforms/iss/console.c
+++ b/arch/xtensa/platforms/iss/console.c
@@ -106,12 +106,6 @@ static unsigned int rs_write_room(struct tty_struct *tty)
return 2 * 1024;
}
-static int rs_chars_in_buffer(struct tty_struct *tty)
-{
- /* the iss doesn't buffer characters */
- return 0;
-}
-
static void rs_hangup(struct tty_struct *tty)
{
/* Stub, once again.. */
@@ -135,7 +129,6 @@ static const struct tty_operations serial_ops = {
.put_char = rs_put_char,
.flush_chars = rs_flush_chars,
.write_room = rs_write_room,
- .chars_in_buffer = rs_chars_in_buffer,
.hangup = rs_hangup,
.wait_until_sent = rs_wait_until_sent,
.proc_show = rs_proc_show,