linux-kernel - Re: [PATCH] xhci: Do not create endpoint debugfs while holding the bandwidth mutex

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Message-ID: <2023053152-pegboard-oncoming-18ce@gregkh>
Date:   Wed, 31 May 2023 14:10:02 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Ricardo Ribalda Delgado <ribalda@...omium.org>
Cc:     Mathias Nyman <mathias.nyman@...el.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephen Boyd <swboyd@...omium.org>
Subject: Re: [PATCH] xhci: Do not create endpoint debugfs while holding the
 bandwidth mutex

On Wed, May 31, 2023 at 02:40:02PM +0200, Ricardo Ribalda Delgado wrote:
> xhci_debugfs_create_endpoint needs to take the mm->mmap_sem, which is
> not serialized with the hcd->bandwidth_mutex across the codebase.
> 
> Without this patch a deadlock has been observed with the uvc driver at
> the functions v4l2_mmap() and usb_set_interface().
> 
> Cc: Stephen Boyd <swboyd@...omium.org

Missing ">" :(