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commit 02a6982b0ccfcdc39e20016f5fc9a1b7826a6ee7 upstream. The check whether the TRB ring is full or empty in dwc3_calc_trbs_left() is insufficient. It assumes there are active TRBs if there's any request in the started_list. However, that's not the case for requests with a large SG list. That is, if we have a single usb request that requires more TRBs than the total TRBs in the TRB ring, the queued TRBs will be available when all the TRBs in the ring are completed. But the request is only partially completed and remains in the started_list. With the current logic, the TRB ring is empty, but dwc3_calc_trbs_left() returns 0. Fix this by additionally checking for the request->num_trbs for active TRB count. Cc: stable@vger.kernel.org Fixes: 51f1954ad853 ("usb: dwc3: gadget: Fix dwc3_calc_trbs_left()") Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com> Link: https://lore.kernel.org/r/708dc62b56b77da1f704cc2ae9b6ddb1f2dbef1f.1731545781.git.Thinh.Nguyen@synopsys.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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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.