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TTY/Serial fixes for 5.11-rc5

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Here are 3 small tty/serial fixes for 5.11-rc5 to resolve reported
 problems:
 	- 2 patches from you to fix up writing to ttys with splice
 	- mvebu-uart driver fix for reported problem.
 
 All of these have been in linux-next with no reported problems.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'tty-5.11-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty

Pull tty/serial fixes from Greg KH:
 "Here are three small tty/serial fixes for 5.11-rc5 to resolve reported
  problems:

   - two patches to fix up writing to ttys with splice

   - mvebu-uart driver fix for reported problem

  All of these have been in linux-next with no reported problems"

* tag 'tty-5.11-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  tty: fix up hung_up_tty_write() conversion
  tty: implement write_iter
  serial: mvebu-uart: fix tx lost characters at power off
This commit is contained in:
Linus Torvalds 2021-01-24 10:56:45 -08:00
commit 4da81fa210
2 changed files with 37 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/tty/serial/mvebu-uart.c
View File

@ -648,6 +648,14 @@ static void wait_for_xmitr(struct uart_port *port)
(val & STAT_TX_RDY(port)), 1, 10000);
}
static void wait_for_xmite(struct uart_port *port)
{
u32 val;
readl_poll_timeout_atomic(port->membase + UART_STAT, val,
(val & STAT_TX_EMP), 1, 10000);
}
static void mvebu_uart_console_putchar(struct uart_port *port, int ch)
{
wait_for_xmitr(port);
@ -675,7 +683,7 @@ static void mvebu_uart_console_write(struct console *co, const char *s,
uart_console_write(port, s, count, mvebu_uart_console_putchar);
wait_for_xmitr(port);
wait_for_xmite(port);
if (ier)
writel(ier, port->membase + UART_CTRL(port));

51
drivers/tty/tty_io.c
View File

@ -143,9 +143,8 @@ LIST_HEAD(tty_drivers); /* linked list of tty drivers */
DEFINE_MUTEX(tty_mutex);
static ssize_t tty_read(struct file *, char __user *, size_t, loff_t *);
static ssize_t tty_write(struct file *, const char __user *, size_t, loff_t *);
ssize_t redirected_tty_write(struct file *, const char __user *,
size_t, loff_t *);
static ssize_t tty_write(struct kiocb *, struct iov_iter *);
ssize_t redirected_tty_write(struct kiocb *, struct iov_iter *);
static __poll_t tty_poll(struct file *, poll_table *);
static int tty_open(struct inode *, struct file *);
long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
@ -438,8 +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;
}
@ -478,7 +476,8 @@ static void tty_show_fdinfo(struct seq_file *m, struct file *file)
static const struct file_operations tty_fops = {
.llseek = no_llseek,
.read = tty_read,
.write = tty_write,
.write_iter = tty_write,
.splice_write = iter_file_splice_write,
.poll = tty_poll,
.unlocked_ioctl = tty_ioctl,
.compat_ioctl = tty_compat_ioctl,
@ -491,7 +490,8 @@ static const struct file_operations tty_fops = {
static const struct file_operations console_fops = {
.llseek = no_llseek,
.read = tty_read,
.write = redirected_tty_write,
.write_iter = redirected_tty_write,
.splice_write = iter_file_splice_write,
.poll = tty_poll,
.unlocked_ioctl = tty_ioctl,
.compat_ioctl = tty_compat_ioctl,
@ -503,7 +503,7 @@ 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,
@ -606,9 +606,9 @@ static void __tty_hangup(struct tty_struct *tty, int exit_session)
/* This breaks for file handles being sent over AF_UNIX sockets ? */
list_for_each_entry(priv, &tty->tty_files, list) {
filp = priv->file;
if (filp->f_op->write == redirected_tty_write)
if (filp->f_op->write_iter == redirected_tty_write)
cons_filp = filp;
if (filp->f_op->write != tty_write)
if (filp->f_op->write_iter != tty_write)
continue;
closecount++;
__tty_fasync(-1, filp, 0); /* can't block */
@ -901,9 +901,9 @@ static inline ssize_t do_tty_write(
ssize_t (*write)(struct tty_struct *, struct file *, const unsigned char *, size_t),
struct tty_struct *tty,
struct file *file,
const char __user *buf,
size_t count)
struct iov_iter *from)
{
size_t count = iov_iter_count(from);
ssize_t ret, written = 0;
unsigned int chunk;
@ -955,14 +955,20 @@ static inline ssize_t do_tty_write(
size_t size = count;
if (size > chunk)
size = chunk;
ret = -EFAULT;
if (copy_from_user(tty->write_buf, buf, size))
if (copy_from_iter(tty->write_buf, size, from) != size)
break;
ret = write(tty, file, tty->write_buf, size);
if (ret <= 0)
break;
/* FIXME! Have Al check this! */
if (ret != size)
iov_iter_revert(from, size-ret);
written += ret;
buf += ret;
count -= ret;
if (!count)
break;
@ -1022,9 +1028,9 @@ void tty_write_message(struct tty_struct *tty, char *msg)
* write method will not be invoked in parallel for each device.
*/
static ssize_t tty_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
static ssize_t tty_write(struct kiocb *iocb, struct iov_iter *from)
{
struct file *file = iocb->ki_filp;
struct tty_struct *tty = file_tty(file);
struct tty_ldisc *ld;
ssize_t ret;
@ -1038,17 +1044,16 @@ static ssize_t tty_write(struct file *file, const char __user *buf,
tty_err(tty, "missing write_room method\n");
ld = tty_ldisc_ref_wait(tty);
if (!ld)
return hung_up_tty_write(file, buf, count, ppos);
return hung_up_tty_write(iocb, from);
if (!ld->ops->write)
ret = -EIO;
else
ret = do_tty_write(ld->ops->write, tty, file, buf, count);
ret = do_tty_write(ld->ops->write, tty, file, from);
tty_ldisc_deref(ld);
return ret;
}
ssize_t redirected_tty_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
ssize_t redirected_tty_write(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *p = NULL;
@ -1059,11 +1064,11 @@ ssize_t redirected_tty_write(struct file *file, const char __user *buf,
if (p) {
ssize_t res;
res = vfs_write(p, buf, count, &p->f_pos);
res = vfs_iocb_iter_write(p, iocb, iter);
fput(p);
return res;
}
return tty_write(file, buf, count, ppos);
return tty_write(iocb, iter);
}
/*
@ -2295,7 +2300,7 @@ static int tioccons(struct file *file)
{
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
if (file->f_op->write == redirected_tty_write) {
if (file->f_op->write_iter == redirected_tty_write) {
struct file *f;
spin_lock(&redirect_lock);
f = redirect;