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| author | Otto Meta <otto.patches@sister-shadow.de> | 2012-06-06 18:46:21 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-22 11:34:15 -0700 |
| commit | 94b71da9193eb95eeef8d09172998c37c2c78327 (patch) | |
| tree | 4f20a7e7705e4e5112817779582048a345409597 /drivers | |
| parent | 2c1a56c8c620ff93050ee4ef545cc585d2f93034 (diff) | |
| download | lwn-94b71da9193eb95eeef8d09172998c37c2c78327.tar.gz lwn-94b71da9193eb95eeef8d09172998c37c2c78327.zip | |
usb: cdc-acm: fix devices not unthrottled on open
commit 6c4707f3f8c44ec18282e1c014c80e1c257042f9 upstream.
Currently CDC-ACM devices stay throttled when their TTY is closed while
throttled, stalling further communication attempts after the next open.
Unthrottling during open/activate got lost starting with kernel
3.0.0 and this patch reintroduces it.
Signed-off-by: Otto Meta <otto.patches@sister-shadow.de>
Acked-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index 158f63121434..496e06e5fa66 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -498,6 +498,14 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp) usb_autopm_put_interface(acm->control); + /* + * Unthrottle device in case the TTY was closed while throttled. + */ + spin_lock_irq(&acm->read_lock); + acm->throttled = 0; + acm->throttle_req = 0; + spin_unlock_irq(&acm->read_lock); + if (acm_submit_read_urbs(acm, GFP_KERNEL)) goto bail_out; |