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tty: make everyone's chars_in_buffer return >= 0

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The tty line disciplines don't expect tty_operations::chars_in_buffer to
return negative values. Fix the two drivers which violate this.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210302062214.29627-43-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby 2021-03-02 07:22:13 +01:00 committed by Greg Kroah-Hartman
parent ab78b0c9fa
commit 10eb63e5a9
2 changed files with 2 additions and 2 deletions
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2
drivers/tty/n_gsm.c
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@ -3056,7 +3056,7 @@ static int gsmtty_chars_in_buffer(struct tty_struct *tty)
{
struct gsm_dlci *dlci = tty->driver_data;
if (dlci->state == DLCI_CLOSED)
return -EINVAL;
return 0;
return kfifo_len(&dlci->fifo);
}

2
drivers/tty/vcc.c
View File

@ -896,7 +896,7 @@ static int vcc_chars_in_buffer(struct tty_struct *tty)
port = vcc_get_ne(tty->index);
if (unlikely(!port)) {
pr_err("VCC: chars_in_buffer: Failed to find VCC port\n");
return -ENODEV;
return 0;
}
num = port->chars_in_buffer;