Hi Jason, On Wed, Nov 21, 2012 at 3:15 PM, Jason Gunthorpe <jguntho...@obsidianresearch.com> wrote: > We've been testing an alternative TPM for our embedded products and > found random kernel boot failures due to time outs after the continue > self test command. > > This was happening randomly, and has been *very* hard to track down, but it > looks like with this chip there is some kind of race with the tpm_tis_status() > check of TPM_STS_COMMAND_READY. If things get there 'too fast' then > it sees the chip is ready, or tpm_tis_ready() works. Otherwise it takes > somewhere over 400ms before the chip will return TPM_STS_COMMAND_READY. > > Adding some delay after tpm_continue_selftest() makes things reliably > hit the failure path, otherwise it is a crapshot.
I've staged this patch here, please test: https://github.com/shpedoikal/linux.git tpmdd-01-22-13 Thanks, Kent -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
