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authorLinus Torvalds <torvalds@linux-foundation.org>2021-01-21 10:04:27 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-01-22 10:52:43 +0100
commitc7135bbe5af2094ef48dff684a5de045f6df66ce (patch)
tree18e8b1c5bef4d51a54ac953c69e84279ff580aa6 /drivers/tty/tty_io.c
parent3cfade53c77315d018c50ea1ee3420cef1c50fe7 (diff)
tty: fix up hung_up_tty_write() conversion
In commit "tty: implement write_iter", I left the write_iter conversion of the hung up tty case alone, because I incorrectly thought it didn't matter. Jiri showed me the errors of my ways, and pointed out the problems with that incomplete conversion. Fix it all up. Reported-by: Jiri Slaby <jirislaby@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Reviewed-by: Jiri Slaby <jirislaby@kernel.org> Link: https://lore.kernel.org/r/CAHk-=wh+-rGsa=xruEWdg_fJViFG8rN9bpLrfLz=_yBYh2tBhA@mail.gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/tty_io.c')
-rw-r--r--drivers/tty/tty_io.c9
1 files changed, 5 insertions, 4 deletions
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index c7763743a3d6..e19071fb9b5b 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -437,8 +437,7 @@ static ssize_t hung_up_tty_read(struct file *file, char __user *buf,
return 0;
}
-static ssize_t hung_up_tty_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
+static ssize_t hung_up_tty_write(struct kiocb *iocb, struct iov_iter *from)
{
return -EIO;
}
@@ -506,7 +505,7 @@ static const struct file_operations console_fops = {
static const struct file_operations hung_up_tty_fops = {
.llseek = no_llseek,
.read = hung_up_tty_read,
- .write = hung_up_tty_write,
+ .write_iter = hung_up_tty_write,
.poll = hung_up_tty_poll,
.unlocked_ioctl = hung_up_tty_ioctl,
.compat_ioctl = hung_up_tty_compat_ioctl,
@@ -1119,7 +1118,9 @@ static ssize_t tty_write(struct kiocb *iocb, struct iov_iter *from)
if (tty->ops->write_room == NULL)
tty_err(tty, "missing write_room method\n");
ld = tty_ldisc_ref_wait(tty);
- if (!ld || !ld->ops->write)
+ if (!ld)
+ return hung_up_tty_write(iocb, from);
+ if (!ld->ops->write)
ret = -EIO;
else
ret = do_tty_write(ld->ops->write, tty, file, from);