i2c: i801: fix potential race in i801_block_transaction_byte_by_byte
Currently we set SMBHSTCNT_LAST_BYTE only after the host has started receiving the last byte. If we get e.g. preempted before setting SMBHSTCNT_LAST_BYTE, the host may be finished with receiving the byte before SMBHSTCNT_LAST_BYTE is set. Therefore change the code to set SMBHSTCNT_LAST_BYTE before writing SMBHSTSTS_BYTE_DONE for the byte before the last byte. Now the code is also consistent with what we do in i801_isr_byte_done(). Reported-by:Jean Delvare <jdelvare@suse.com> Closes: https://lore.kernel.org/linux-i2c/20230828152747.09444625@endymion.delvare/ Cc: stable@vger.kernel.org Acked-by:
Andi Shyti <andi.shyti@kernel.org> Signed-off-by:
Heiner Kallweit <hkallweit1@gmail.com> Reviewed-by:
Jean Delvare <jdelvare@suse.de> Signed-off-by:
Wolfram Sang <wsa@kernel.org>
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