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| author | Oliver Neukum <oliver@neukum.org> | 2008-02-11 15:22:29 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2008-02-21 15:38:49 -0800 |
| commit | 94409cc1e507b157f8442dad80ff5e560c3205e5 (patch) | |
| tree | e667c909f8da47694d2fbe9ca5eda4a4b86256cc /drivers/usb/class | |
| parent | 59036e94732edc2fb957465008c68bbcfc6736fa (diff) | |
| download | linux-94409cc1e507b157f8442dad80ff5e560c3205e5.tar.gz linux-94409cc1e507b157f8442dad80ff5e560c3205e5.tar.bz2 linux-94409cc1e507b157f8442dad80ff5e560c3205e5.zip | |
USB: fix usb open suspend race in cdc-acm
this fixes a race between open and disconnect in the CDC ACM driver.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/class')
| -rw-r--r-- | drivers/usb/class/cdc-acm.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index bcc42136c93f..0147ea39340e 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -496,13 +496,10 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp) otherwise it is scheduled, and with high data rates data can get lost. */ tty->low_latency = 1; - if (usb_autopm_get_interface(acm->control)) { - mutex_unlock(&open_mutex); - return -EIO; - } + if (usb_autopm_get_interface(acm->control) < 0) + goto early_bail; mutex_lock(&acm->mutex); - mutex_unlock(&open_mutex); if (acm->used++) { usb_autopm_put_interface(acm->control); goto done; @@ -536,6 +533,7 @@ static int acm_tty_open(struct tty_struct *tty, struct file *filp) done: err_out: mutex_unlock(&acm->mutex); + mutex_unlock(&open_mutex); return rv; full_bailout: @@ -544,6 +542,8 @@ bail_out: usb_autopm_put_interface(acm->control); acm->used--; mutex_unlock(&acm->mutex); +early_bail: + mutex_unlock(&open_mutex); return -EIO; } |