Peter Chen <peter.chen@xxxxxxxxxx> writes: > On 21-06-10 08:36:57, Greg Kroah-Hartman wrote: >> On Thu, Jun 10, 2021 at 10:00:47AM +0800, Peter Chen wrote: >> > On 21-06-09 11:42:53, Greg Kroah-Hartman wrote: >> > > On Wed, Jun 09, 2021 at 11:01:07AM +0200, Greg Kroah-Hartman wrote: >> > > > On Tue, Jun 08, 2021 at 09:50:01AM -0700, Jack Pham wrote: >> > > > > Hi Peter, >> > > > > >> > > > > On Tue, Jun 08, 2021 at 06:56:56PM +0800, Peter Chen wrote: >> > > > > > When do system reboot, it calls dwc3_shutdown and the whole debugfs >> > > > > > for dwc3 has removed first, when the gadget tries to do deinit, and >> > > > > > remove debugfs for its endpoints, it meets NULL pointer dereference >> > > > > > issue when call debugfs_lookup. Fix it by removing the whole dwc3 >> > > > > > debugfs later than dwc3_drd_exit. >> > > > > >> > > > > Ouch, thanks for catching this! I think in your previous reply[1] you >> > > > > did warn about the debugfs_remove_recursive() getting called twice, but >> > > > > it seems here the issue is due to the debugfs_lookup() getting called on >> > > > > a stale dwc->root pointer after it was already removed. >> > > > >> > > > We can also fix this by getting rid of that "root" pointer as it's >> > > > useless (we can look it up if we need it.) I'll send a patch later to >> > > > do that, as it's a good idea to do anyway, and is independant of this >> > > > fix. >> > > >> > > Now sent: >> > > https://lore.kernel.org/r/20210609093924.3293230-1-gregkh@xxxxxxxxxxxxxxxxxxx >> > >> > Hi Felipe, >> > >> > With Greg above patch, this issue is fixed indirectly. I don't think my patch is >> > needed, do you think so? >> >> Which patch is "your patch" here? >> > > The patch in this thread. This one, Greg: https://lore.kernel.org/r/20210609093924.3293230-1-gregkh@xxxxxxxxxxxxxxxxxxx Now that we have that, I don't think $subject is required. -- balbi
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