Re: [PATCH v2] usb: gadget: f_fs: Use stream_open() for endpoint files

[Greg Kroah-Hartman]

On Thu, Nov 11, 2021 at 05:45:56PM +0530, Pavankumar Kondeti wrote:
> Function fs endpoint files does not have the notion of file position.
> So switch to stream like functionality. This allows concurrent threads
> to be blocked in the ffs read/write operations which use ffs_mutex_lock().
> The ffs mutex lock deploys interruptible wait. Otherwise, threads are
> blocking for the mutex lock in __fdget_pos(). For whatever reason, ff the
> host does not send/receive data for longer time, hung task warnings
> are observed.

So the current code is broken?  What commit caused it to break?

Doesn't this change cause a change in behavior for existing userspace
tools, or will they still work as-is?

thanks,

greg k-h