From: Stefan Berger stefanb@linux.ibm.com
commit dda8b2af395b2ed508e2ef314ae32e122841b447 upstream.
There has been a bunch of reports (one from kernel bugzilla linked) reporting that when this commit is applied it causes on some machines boot freezes.
Unfortunately hardware where this commit causes a failure is not widely available (only one I'm aware is Lenovo T490), which means we cannot predict yet how long it will take to properly fix tpm_tis interrupt probing.
Thus, the least worst short term action is to revert the code to the state before this commit. In long term we need fix the tpm_tis probing code to work on machines that Stefan's fix was supposed to fix.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=205935 Fixes: 1ea32c83c699 ("tpm_tis_core: Set TPM_CHIP_FLAG_IRQ before probing for interrupts") Cc: stable@vger.kernel.org Cc: Jerry Snitselaar jsnitsel@redhat.com Cc: Dan Williams dan.j.williams@intel.com Tested-by: Dan Williams dan.j.williams@intel.com Tested-by: Xiaoping Zhou xiaoping.zhou@intel.com Signed-off-by: Stefan Berger stefanb@linux.ibm.com Reported-by: Jerry Snitselaar jsnitsel@redhat.com Signed-off-by: Jarkko Sakkinen jarkko.sakkinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/char/tpm/tpm_tis_core.c | 1 - 1 file changed, 1 deletion(-)
--- a/drivers/char/tpm/tpm_tis_core.c +++ b/drivers/char/tpm/tpm_tis_core.c @@ -981,7 +981,6 @@ int tpm_tis_core_init(struct device *dev }
tpm_chip_start(chip); - chip->flags |= TPM_CHIP_FLAG_IRQ; if (irq) { tpm_tis_probe_irq_single(chip, intmask, IRQF_SHARED, irq);