From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754722AbbLQSYJ (ORCPT ); Thu, 17 Dec 2015 13:24:09 -0500 Received: from quartz.orcorp.ca ([184.70.90.242]:40608 "EHLO quartz.orcorp.ca" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751916AbbLQSXe (ORCPT ); Thu, 17 Dec 2015 13:23:34 -0500 From: Jason Gunthorpe To: Jarkko Sakkinen , tpmdd-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org Cc: Martin Wilck , Peter Huewe , =?UTF-8?q?Uwe=20Kleine-K=C3=B6nig?= Subject: [PATCH v3 4/7] tpm_tis: Use devm_ioremap_resource Date: Thu, 17 Dec 2015 11:23:17 -0700 Message-Id: <1450376600-6970-5-git-send-email-jgunthorpe@obsidianresearch.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1450376600-6970-1-git-send-email-jgunthorpe@obsidianresearch.com> References: <1450376600-6970-1-git-send-email-jgunthorpe@obsidianresearch.com> X-Broken-Reverse-DNS: no host name found for IP address 10.0.0.160 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This does a request_resource under the covers which means tis holds a lock on the memory range it is using so other drivers cannot grab it. When doing probing it is important to ensure that other drivers are not using the same range before tis starts touching it. To do this flow the actual struct resource from the device right through to devm_ioremap_resource. This ensures all the proper resource meta-data is carried down. Signed-off-by: Jason Gunthorpe Tested-by: Wilck, Martin Tested-by: Jarkko Sakkinen --- drivers/char/tpm/tpm_tis.c | 29 ++++++++++++++++------------- 1 file changed, 16 insertions(+), 13 deletions(-) diff --git a/drivers/char/tpm/tpm_tis.c b/drivers/char/tpm/tpm_tis.c index b2b31f5418ca..856fb35e574c 100644 --- a/drivers/char/tpm/tpm_tis.c +++ b/drivers/char/tpm/tpm_tis.c @@ -67,8 +67,7 @@ enum tis_defaults { }; struct tpm_info { - unsigned long start; - unsigned long len; + struct resource res; /* irq > 0 means: use irq $irq; * irq = 0 means: autoprobe for an irq; * irq = -1 means: no irq support @@ -77,8 +76,11 @@ struct tpm_info { }; static struct tpm_info tis_default_info = { - .start = TIS_MEM_BASE, - .len = TIS_MEM_LEN, + .res = { + .start = TIS_MEM_BASE, + .end = TIS_MEM_BASE + TIS_MEM_LEN - 1, + .flags = IORESOURCE_MEM, + }, .irq = 0, }; @@ -692,7 +694,7 @@ static int tpm_tis_init(struct device *dev, struct tpm_info *tpm_info, chip->acpi_dev_handle = acpi_dev_handle; #endif - chip->vendor.iobase = devm_ioremap(dev, tpm_info->start, tpm_info->len); + chip->vendor.iobase = devm_ioremap_resource(dev, &tpm_info->res); if (!chip->vendor.iobase) return -EIO; @@ -875,9 +877,12 @@ static int tpm_tis_pnp_init(struct pnp_dev *pnp_dev, { struct tpm_info tpm_info = {}; acpi_handle acpi_dev_handle = NULL; + struct resource *res; - tpm_info.start = pnp_mem_start(pnp_dev, 0); - tpm_info.len = pnp_mem_len(pnp_dev, 0); + res = pnp_get_resource(pnp_dev, IORESOURCE_MEM, 0); + if (!res) + return -ENODEV; + tpm_info.res = *res; if (pnp_irq_valid(pnp_dev, 0)) tpm_info.irq = pnp_irq(pnp_dev, 0); @@ -940,12 +945,10 @@ static int tpm_check_resource(struct acpi_resource *ares, void *data) struct tpm_info *tpm_info = (struct tpm_info *) data; struct resource res; - if (acpi_dev_resource_interrupt(ares, 0, &res)) { + if (acpi_dev_resource_interrupt(ares, 0, &res)) tpm_info->irq = res.start; - } else if (acpi_dev_resource_memory(ares, &res)) { - tpm_info->start = res.start; - tpm_info->len = resource_size(&res); - } + else if (acpi_dev_resource_memory(ares, &res)) + tpm_info->res = res; return 1; } @@ -978,7 +981,7 @@ static int tpm_tis_acpi_init(struct acpi_device *acpi_dev) acpi_dev_free_resource_list(&resources); - if (tpm_info.start == 0 && tpm_info.len == 0) { + if (resource_type(&tpm_info.res) != IORESOURCE_MEM) { dev_err(&acpi_dev->dev, FW_BUG "TPM2 ACPI table does not define a memory resource\n"); return -EINVAL; -- 2.1.4