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27 March 2024, 02:37:15 UTC
Revision 5eb173f5c8f3a3cdc47b3952c368f10a28c81ab8 authored by George Cherian on 09 August 2018, 06:36:48 UTC, committed by Wolfram Sang on 09 August 2018, 15:41:13 UTC 
i2c: xlp9xx: Fix case where SSIF read transaction completes early
 
During ipmi stress tests we see occasional failure of transactions
at the boot time. This happens in the case of a I2C_M_RECV_LEN
transactions, when the read transfer completes (with the initial
read length of 34) before the driver gets a chance to handle interrupts.

The current driver code expects at least 2 interrupts for I2C_M_RECV_LEN
transactions. The length is updated during the first interrupt, and  the
buffer contents are only copied during subsequent interrupts. In case of
just one interrupt, we will complete the transaction without copying
out the bytes from RX fifo.

Update the code to drain the RX fifo after the length update,
so that the transaction completes correctly in all cases.

Signed-off-by: George Cherian <george.cherian@cavium.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
1 parent 1ffaddd
History
Tip revision: 5eb173f5c8f3a3cdc47b3952c368f10a28c81ab8 authored by George Cherian on 09 August 2018, 06:36:48 UTC
i2c: xlp9xx: Fix case where SSIF read transaction completes early
Tip revision: 5eb173f
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