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SubjectRe: [PATCH] usb: host: u132-hcd: Remove u132_static_list
On Fri, Apr 03, 2020 at 10:39:33AM -0400, Alan Stern wrote:
> On Fri, 3 Apr 2020 madhuparnabhowmik10@gmail.com wrote:
>
> > From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
> >
> > u132_static_list is a global list protected by u132_module_lock.
> > It is read in the u132_hcd_exit() function without holding the lock
> > thus may lead to data race.
> > However, it turns out that this list isn't used for anything useful
> > and thus it is okay to get rid of it.
> > Thus, remove the u132_static_list from u132-hcd module.
> >
> > Found by Linux Driver Verification project (linuxtesting.org).
> >
> > Suggested-by: Alan Stern <stern@rowland.harvard.edu>
> > Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
> > ---
> > drivers/usb/host/u132-hcd.c | 8 --------
> > 1 file changed, 8 deletions(-)
> >
> > diff --git a/drivers/usb/host/u132-hcd.c b/drivers/usb/host/u132-hcd.c
> > index e9209e3e6248..52f70cf063ea 100644
> > --- a/drivers/usb/host/u132-hcd.c
> > +++ b/drivers/usb/host/u132-hcd.c
> > @@ -81,7 +81,6 @@ static DECLARE_WAIT_QUEUE_HEAD(u132_hcd_wait);
> > static struct mutex u132_module_lock;
> > static int u132_exiting;
> > static int u132_instances;
> > -static struct list_head u132_static_list;
> > /*
> > * end of the global variables protected by u132_module_lock
> > */
>
> You forgot to remove the u132_list member from struct u132.
>
Thank you for letting me know, I will send the patch again with this
change.

Regards,
Madhuparna

> Alan Stern
>

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