diff mbox

Gadget regression with u_ether in Linux next

Message ID 87h99c4804.fsf@linux.intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Felipe Balbi Sept. 19, 2016, 8:19 a.m. UTC 
Hi Greg,

Tony Lindgren <tony@atomide.com> writes:
> Hi,
>
> Looks like commit c9ffc78745f8 ("usb: gadget: NCM: Protect dev->port_usb
> using dev->lock") causes hangs for me with Linux next.
>
> Reverting c9ffc78745f8 makes the issues go away, some more info below.

Can you revert this commit from your tree?

Here's the full commit for reference:

commit c9ffc78745f89e300fe704348dd8e6800acf4d18
Author: Harish Jenny K N <harish_kandiga@mentor.com>
Date:   Fri Sep 9 11:30:42 2016 +0200

    usb: gadget: NCM: Protect dev->port_usb using dev->lock
    
    This commit incorporates findings from
    https://lkml.org/lkml/2016/4/25/594
    
    The function has been modified to make sure we hold
    the dev lock when accessing the net device pointer.
    
    Acked-by: Jim Baxter <jim_baxter@mentor.com>
    Signed-off-by: Harish Jenny K N <harish_kandiga@mentor.com>
    Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Comments

Greg Kroah-Hartman Sept. 19, 2016, 9:07 a.m. UTC | #1 
On Mon, Sep 19, 2016 at 11:19:07AM +0300, Felipe Balbi wrote:
> 
> Hi Greg,
> 
> Tony Lindgren <tony@atomide.com> writes:
> > Hi,
> >
> > Looks like commit c9ffc78745f8 ("usb: gadget: NCM: Protect dev->port_usb
> > using dev->lock") causes hangs for me with Linux next.
> >
> > Reverting c9ffc78745f8 makes the issues go away, some more info below.
> 
> Can you revert this commit from your tree?
> 
> Here's the full commit for reference:
> 
> commit c9ffc78745f89e300fe704348dd8e6800acf4d18
> Author: Harish Jenny K N <harish_kandiga@mentor.com>
> Date:   Fri Sep 9 11:30:42 2016 +0200
> 
>     usb: gadget: NCM: Protect dev->port_usb using dev->lock
>     
>     This commit incorporates findings from
>     https://lkml.org/lkml/2016/4/25/594
>     
>     The function has been modified to make sure we hold
>     the dev lock when accessing the net device pointer.
>     
>     Acked-by: Jim Baxter <jim_baxter@mentor.com>
>     Signed-off-by: Harish Jenny K N <harish_kandiga@mentor.com>
>     Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>

Now reverted, thanks.

greg k-h
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diff mbox

Patch

diff --git a/drivers/usb/gadget/function/u_ether.c b/drivers/usb/gadget/function/u_ether.c
index 9c8c9ed1dc9e..8cb08033b7c1 100644
--- a/drivers/usb/gadget/function/u_ether.c
+++ b/drivers/usb/gadget/function/u_ether.c
@@ -553,14 +553,16 @@  static netdev_tx_t eth_start_xmit(struct sk_buff *skb,
                spin_lock_irqsave(&dev->lock, flags);
                if (dev->port_usb)
                        skb = dev->wrap(dev->port_usb, skb);
-               spin_unlock_irqrestore(&dev->lock, flags);
                if (!skb) {
                        /* Multi frame CDC protocols may store the frame for
                         * later which is not a dropped frame.
                         */
                        if (dev->port_usb &&
-                                       dev->port_usb->supports_multi_frame)
+                                       dev->port_usb->supports_multi_frame) {
+                               spin_unlock_irqrestore(&dev->lock, flags);
                                goto multiframe;
+                       }
+                       spin_unlock_irqrestore(&dev->lock, flags);
                        goto drop;
                }
        }