From: Oliver Neukum <oneukum@suse.com>
To: gregKH@linuxfoundation.org, linux-usb@vger.kernel.org
Cc: Oliver Neukum <oneukum@suse.com>
Subject: [PATCH] CDC-ACM: fix poison/unpoison imbalance
Date: Wed, 21 Apr 2021 09:45:13 +0200 [thread overview]
Message-ID: <20210421074513.4327-1-oneukum@suse.com> (raw)
suspend() does its poisoning conditionally, resume() does it
unconditionally. On a device with combined interfaces this
will balance, on a device with two interfaces the counter will
go negative and resubmission will fail.
Both actions need to be done conditionally.
Fixes: 6069e3e927c8f ("USB: cdc-acm: untangle a circular dependency between callback and softint")
Signed-off-by: Oliver Neukum <oneukum@suse.com>
---
drivers/usb/class/cdc-acm.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 3fda1ec961d7..f5886c512fec 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -1634,12 +1634,13 @@ static int acm_resume(struct usb_interface *intf)
struct urb *urb;
int rv = 0;
- acm_unpoison_urbs(acm);
spin_lock_irq(&acm->write_lock);
if (--acm->susp_count)
goto out;
+ acm_unpoison_urbs(acm);
+
if (tty_port_initialized(&acm->port)) {
rv = usb_submit_urb(acm->ctrlurb, GFP_ATOMIC);
--
2.26.2
next reply other threads:[~2021-04-21 7:45 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-21 7:45 Oliver Neukum [this message]
2021-04-22 11:35 ` [PATCH] CDC-ACM: fix poison/unpoison imbalance Stefan Agner
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