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bd4caf585b
commite752dbc59eupstream. The usb3_start_pipen() is called by renesas_usb3_ep_queue() and usb3_request_done_pipen() so that usb3_start_pipen() is possible to cause a race when getting usb3_first_req like below: renesas_usb3_ep_queue() spin_lock_irqsave() list_add_tail() spin_unlock_irqrestore() usb3_start_pipen() usb3_first_req = usb3_get_request() --- [1] --- interrupt --- usb3_irq_dma_int() usb3_request_done_pipen() usb3_get_request() usb3_start_pipen() usb3_first_req = usb3_get_request() ... (the req is possible to be finished in the interrupt) The usb3_first_req [1] above may have been finished after the interrupt ended so that this driver caused to start a transfer wrongly. To fix this issue, getting/checking the usb3_first_req are under spin_lock_irqsave() in the same section. Fixes:746bfe63bb("usb: gadget: renesas_usb3: add support for Renesas USB3.0 peripheral controller") Cc: stable <stable@vger.kernel.org> Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com> Link: https://lore.kernel.org/r/20210524060155.1178724-1-yoshihiro.shimoda.uh@renesas.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.