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We can never assume the uart will deliver a complete packet to the BT layer at once, the expected packet may be divided into several parts by uart as uart doesn't know the received packet size, the received data count may mismatch with the expected packet size, so here is_valid_bootloader_signature() check may always return false. Even we remove the count check in is_valid_bootloader_signature(), then the first part of the data which includes the packet type can pass the is_valid_bootloader_signature() check, but the remaining parts don't have the packet type data still cannot pass the check, here return directly will cause the data loss. So need to remove the received bootloader signature check here, the h4_recv_buf() can help us combine the different data received into one packet. If any out-of-sync or incomplete bootloader signature is received, it is safe to ignore and discard it, and process the next bootloader signature. Co-developed-by: Sherry Sun <sherry.sun@nxp.com> Signed-off-by: Sherry Sun <sherry.sun@nxp.com> Signed-off-by: Neeraj Sanjay Kale <neeraj.sanjaykale@nxp.com> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
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.