Messages in this thread | | | Date | Thu, 29 Jun 2017 01:11:38 +0300 | From | Jarkko Sakkinen <> | Subject | Re: [PATCH v2] tpm: Fix the ioremap() call for Braswell systems |
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On Thu, Jun 22, 2017 at 02:32:01PM -0700, Azhar Shaikh wrote: > ioremap() for Intel Braswell processors was done in > tpm_tis_pnp_init(). But before this function gets called, > platform driver 'tis_drv' gets registered and its probe function > tpm_tis_plat_probe() is invoked, which does a TPM > access. Now for Braswell processors tpm_platform_begin_xfer() > will do an ioread32() without having a mapped address, which > will lead to a bad I/O access warning. > Hence move the ioremap() call from tpm_tis_pnp_init() to init_tis() > before registering the 'tis_drv' or basically before any TPM access. > Accordingly also move the iounmap() call from tpm_tis_pnp_remove() > to cleanup_tis() after all TPM access are completed. > > Signed-off-by: Azhar Shaikh <azhar.shaikh@intel.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
> --- > Changes from v1: > - Do error handling in init_ts(). > - Update the commit message. > > drivers/char/tpm/tpm_tis.c | 25 +++++++++++++------------ > 1 file changed, 13 insertions(+), 12 deletions(-) > > diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c > index 506e62ca3576..d97ce22267fb 100644 > --- a/drivers/char/tpm/tpm_tis.c > +++ b/drivers/char/tpm/tpm_tis.c > @@ -330,12 +330,6 @@ static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev, > else > tpm_info.irq = -1; > > -#ifdef CONFIG_X86 > - if (is_bsw()) > - ilb_base_addr = ioremap(INTEL_LEGACY_BLK_BASE_ADDR, > - ILB_REMAP_SIZE); > -#endif > - > return tpm_tis_init(&pnp_dev->dev, &tpm_info); > } > > @@ -359,12 +353,6 @@ static void tpm_tis_pnp_remove(struct pnp_dev *dev) > > tpm_chip_unregister(chip); > tpm_tis_remove(chip); > - > -#ifdef CONFIG_X86 > - if (is_bsw()) > - iounmap(ilb_base_addr); > -#endif > - > } > > static struct pnp_driver tis_pnp_driver = { > @@ -472,6 +460,11 @@ static int __init init_tis(void) > if (rc) > goto err_force; > > +#ifdef CONFIG_X86 > + if (is_bsw()) > + ilb_base_addr = ioremap(INTEL_LEGACY_BLK_BASE_ADDR, > + ILB_REMAP_SIZE); > +#endif > rc = platform_driver_register(&tis_drv); > if (rc) > goto err_platform; > @@ -490,6 +483,10 @@ static int __init init_tis(void) > err_platform: > if (force_pdev) > platform_device_unregister(force_pdev); > +#ifdef CONFIG_X86 > + if (is_bsw()) > + iounmap(ilb_base_addr); > +#endif > err_force: > return rc; > } > @@ -499,6 +496,10 @@ static void __exit cleanup_tis(void) > pnp_unregister_driver(&tis_pnp_driver); > platform_driver_unregister(&tis_drv); > > +#ifdef CONFIG_X86 > + if (is_bsw()) > + iounmap(ilb_base_addr); > +#endif > if (force_pdev) > platform_device_unregister(force_pdev); > } > -- > 1.9.1 >
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