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Under certain conditions, Cadence's I2C controller's transfer_size
register will roll over and generate invalid read transactions. Before
this change, the ISR relied solely on the RXDV bit to determine when to
write more data to the user's buffer. The invalid read data would cause
overruns, smashing stacks and worse.
This change stops the buffer writes to the requested boundary and
reports the error. The controller will be reset so normal transactions
may resume.
Signed-off-by: Alex Williams <alex.williams@ni.com>
Reviewed-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
Reviewed-by: Michal Simek <michal.simek@xilinx.com> # in a seperate mail
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
bbf967b223