We can simply the runtime PM locking as there's no need to check the
susp_count in the read path (at least not since killing the rx tasklet).
Specifically, the read urbs will never be resubmitted by the completion
handler when killed during suspend.
Signed-off-by: Johan Hovold <jhov...@gmail.com>
---
drivers/usb/class/cdc-acm.c | 17 ++++++-----------
1 file changed, 6 insertions(+), 11 deletions(-)
diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c
index 6bbd203f1861..bc7a2a6fc4ac 100644
--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -428,7 +428,7 @@ static void acm_read_bulk_callback(struct urb *urb)
/* throttle device if requested by tty */
spin_lock_irqsave(&acm->read_lock, flags);
acm->throttled = acm->throttle_req;
- if (!acm->throttled && !acm->susp_count) {
+ if (!acm->throttled) {
spin_unlock_irqrestore(&acm->read_lock, flags);
acm_submit_read_urb(acm, rb->index, GFP_ATOMIC);
} else {
@@ -1546,18 +1546,15 @@ static int acm_suspend(struct usb_interface *intf,
pm_message_t message)
struct acm *acm = usb_get_intfdata(intf);
int cnt;
- spin_lock_irq(&acm->read_lock);
- spin_lock(&acm->write_lock);
+ spin_lock_irq(&acm->write_lock);
if (PMSG_IS_AUTO(message)) {
if (acm->transmitting) {
- spin_unlock(&acm->write_lock);
- spin_unlock_irq(&acm->read_lock);
+ spin_unlock_irq(&acm->write_lock);
return -EBUSY;
}
}
cnt = acm->susp_count++;
- spin_unlock(&acm->write_lock);
- spin_unlock_irq(&acm->read_lock);
+ spin_unlock_irq(&acm->write_lock);
if (cnt)
return 0;
@@ -1573,8 +1570,7 @@ static int acm_resume(struct usb_interface *intf)
struct urb *urb;
int rv = 0;
- spin_lock_irq(&acm->read_lock);
- spin_lock(&acm->write_lock);
+ spin_lock_irq(&acm->write_lock);
if (--acm->susp_count)
goto out;
@@ -1600,8 +1596,7 @@ static int acm_resume(struct usb_interface *intf)
rv = acm_submit_read_urbs(acm, GFP_ATOMIC);
}
out:
- spin_unlock(&acm->write_lock);
- spin_unlock_irq(&acm->read_lock);
+ spin_unlock_irq(&acm->write_lock);
return rv;
}
--
1.8.5.5
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