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author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-11-22 11:52:10 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-11-22 11:52:10 -0800 |
commit | de758035702576ac0e5ac0f93e3cce77144c3bd3 (patch) | |
tree | 17e38d75e55d422d46bc3fc630bc9587ca94d01b /drivers/accessibility/speakup | |
parent | a7f07fc14f06f98fc5fe1208bac5f6f5bcda2c10 (diff) | |
parent | 425af483523b76bc78e14674a430579d38b2a593 (diff) | |
download | linux-stable-de758035702576ac0e5ac0f93e3cce77144c3bd3.tar.gz linux-stable-de758035702576ac0e5ac0f93e3cce77144c3bd3.tar.bz2 linux-stable-de758035702576ac0e5ac0f93e3cce77144c3bd3.zip |
Merge tag 'tty-5.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull tty fixes from Greg KH:
"Here are some small tty/serial fixes for 5.10-rc5 that resolve some
reported issues:
- speakup crash when telling the kernel to use a device that isn't
really there
- imx serial driver fixes for reported problems
- ar933x_uart driver fix for probe error handling path
All have been in linux-next for a while with no reported issues"
* tag 'tty-5.10-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
serial: ar933x_uart: disable clk on error handling path in probe
tty: serial: imx: keep console clocks always on
speakup: Do not let the line discipline be used several times
tty: serial: imx: fix potential deadlock
Diffstat (limited to 'drivers/accessibility/speakup')
-rw-r--r-- | drivers/accessibility/speakup/spk_ttyio.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/accessibility/speakup/spk_ttyio.c b/drivers/accessibility/speakup/spk_ttyio.c index ecc39983e946..669392f31d4e 100644 --- a/drivers/accessibility/speakup/spk_ttyio.c +++ b/drivers/accessibility/speakup/spk_ttyio.c @@ -49,15 +49,25 @@ static int spk_ttyio_ldisc_open(struct tty_struct *tty) if (!tty->ops->write) return -EOPNOTSUPP; + + mutex_lock(&speakup_tty_mutex); + if (speakup_tty) { + mutex_unlock(&speakup_tty_mutex); + return -EBUSY; + } speakup_tty = tty; ldisc_data = kmalloc(sizeof(*ldisc_data), GFP_KERNEL); - if (!ldisc_data) + if (!ldisc_data) { + speakup_tty = NULL; + mutex_unlock(&speakup_tty_mutex); return -ENOMEM; + } init_completion(&ldisc_data->completion); ldisc_data->buf_free = true; speakup_tty->disc_data = ldisc_data; + mutex_unlock(&speakup_tty_mutex); return 0; } |