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PCI/DOE: Fix maximum data object length miscalculation
commit a4ff8e7 upstream. Per PCIe r6.0, sec 6.30.1, a data object Length of 0x0 indicates 2^18 DWORDs (256K DW or 1MB) being transferred. Adjust the value of data object length for this case on both sending side and receiving side. Don't bother checking whether Length is greater than SZ_1M because all values of the 18-bit Length field are valid, and it is impossible to represent anything larger than SZ_1M: 0x00000 256K DW (1M bytes) 0x00001 1 DW (4 bytes) ... 0x3ffff 256K-1 DW (1M - 4 bytes) [bhelgaas: commit log] Link: https://lore.kernel.org/r/20221116015637.3299664-1-ming4.li@intel.com Fixes: 9d24322 ("PCI/DOE: Add DOE mailbox support functions") Signed-off-by: Li Ming <ming4.li@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Lukas Wunner <lukas@wunner.de> Cc: stable@vger.kernel.org # v6.0+ Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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