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wifi: rtw89: pci: fix RX tag race condition resulting in wrong RX length
[ Upstream commit 94298477f81a1701fc4e1b5a0ce9672acab5dcb2 ] Read 32 bits RX info to a local variable to fix race condition between reading RX length and RX tag. Another solution is to get RX tag at first statement, but adopted solution can save some memory read, and also save 15 bytes binary code. RX tag, a sequence number, is used to ensure that RX data has been DMA to memory completely, so driver must check sequence number is expected before reading other data. This potential problem happens only after enabling 36-bit DMA. Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Link: https://msgid.link/20240611021901.26394-2-pkshih@realtek.com Signed-off-by: Sasha Levin <sashal@kernel.org> (cherry picked from commit 33e320ec6cdc1864a5624ea6ec51fce155b5668a)
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