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cdc-acm: fix race between initial clearing halt and open

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[ Upstream commit 64690a90cd7c6db16d3af8616be1f4bf8d492850 ]

On the devices that need their endpoints to get an
initial clear_halt, this needs to be done before
the devices can be opened. That means it needs to be
before the devices are registered.

Fixes: 15bf722e6f ("cdc-acm: Add support of ATOL FPrint fiscal printers")
Cc: stable <stable@kernel.org>
Signed-off-by: Oliver Neukum <oneukum@suse.com>
Link: https://lore.kernel.org/r/20250717141259.2345605-1-oneukum@suse.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oliver Neukum 2025-08-18 19:13:58 -04:00 • committed by Greg Kroah-Hartman
commit 0e35cac65a
1 changed files with 6 additions and 5 deletions
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11
drivers/usb/class/cdc-acm.c
View file

@ -1527,6 +1527,12 @@ skip_countries:
usb_driver_claim_interface(&acm_driver, data_interface, acm);
usb_set_intfdata(data_interface, acm);
if (quirks & CLEAR_HALT_CONDITIONS) {
/* errors intentionally ignored */
usb_clear_halt(usb_dev, acm->in);
usb_clear_halt(usb_dev, acm->out);
}
tty_dev = tty_port_register_device(&acm->port, acm_tty_driver, minor,
&control_interface->dev);
if (IS_ERR(tty_dev)) {
@ -1534,11 +1540,6 @@ skip_countries:
goto alloc_fail6;
}
if (quirks & CLEAR_HALT_CONDITIONS) {
usb_clear_halt(usb_dev, acm->in);
usb_clear_halt(usb_dev, acm->out);
}
dev_info(&intf->dev, "ttyACM%d: USB ACM device\n", minor);
return 0;