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net: hso: fix TIOCMIWAIT race

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The task state must be updated before checking the wakeup condition to
avoid missing a racing modem status update.

Fixes: 542f548236 ("tty: Modem functions for the HSO driver")
Cc: stable@vger.kernel.org	# 2.6.29
Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260907065235.100848-1-johan@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Johan Hovold 2026-09-07 08:52:35 +02:00 committed by Paolo Abeni
parent 7f26a5e804
commit 00f9fbc123
1 changed files with 1 additions and 1 deletions
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2
drivers/net/usb/hso.c
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@ -1547,10 +1547,10 @@ hso_wait_modem_status(struct hso_serial *serial, unsigned long arg)
spin_unlock_irq(&serial->serial_lock);
add_wait_queue(&tiocmget->waitq, &wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
spin_lock_irq(&serial->serial_lock);
memcpy(&cnow, &tiocmget->icount, sizeof(struct uart_icount));
spin_unlock_irq(&serial->serial_lock);
set_current_state(TASK_INTERRUPTIBLE);
if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd))) {