On Tue, Jan 22, 2013 at 05:29:23PM -0600, Kent Yoder wrote: > 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, I will try to test your branch next week, if I am able. Can you also grab https://github.com/jgunthorpe/linux/commit/98b2a198b43b41b0535200bf475160786398f114 And did you have any comments on: https://github.com/jgunthorpe/linux/commit/9981e3e622bf702394982117134bed731ffd6f7e Both were posted to the list a bit ago. Regards, -- Jason Gunthorpe <jguntho...@obsidianresearch.com> (780)4406067x832 Chief Technology Officer, Obsidian Research Corp Edmonton, Canada -- 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/
