> -----Original Message----- > From: Jason Gunthorpe [mailto:jguntho...@obsidianresearch.com] > Sent: Thursday, June 22, 2017 1:20 PM > To: Shaikh, Azhar <azhar.sha...@intel.com> > Cc: jarkko.sakki...@linux.intel.com; tpmdd-de...@lists.sourceforge.net; > linux-security-mod...@vger.kernel.org; linux-kernel@vger.kernel.org > Subject: Re: [tpmdd-devel] [PATCH] tpm: Fix the ioremap() call for Braswell > systems > > On Thu, Jun 22, 2017 at 11:29:57AM -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(). > > > > Signed-off-by: Azhar Shaikh <azhar.sha...@intel.com> > > drivers/char/tpm/tpm_tis.c | 21 +++++++++------------ > > 1 file changed, 9 insertions(+), 12 deletions(-) > > > > diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c > > index 506e62ca3576..3224db80816a 100644 > > +++ 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 > > The iounmap needs to be in the goto unwind for init_tis as well, surely? >
Yes! Should have checked before... > > rc = platform_driver_register(&tis_drv); > > if (rc) > > goto err_platform; > > Jason
