| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 24 Oct 2019 17:38:25 +0100
From: Lee Jones <lee.jones@...aro.org>
To: daniel.thompson@...aro.org, arnd@...db.de, broonie@...nel.org,
linus.walleij@...aro.org
Cc: linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
baohua@...nel.org, stephan@...hold.net,
Lee Jones <lee.jones@...aro.org>
Subject: [PATCH v3 03/10] mfd: cs5535-mfd: Request shared IO regions centrally
Prior to this patch, IO regions were requested via an MFD subsytem-level
.enable() call-back and similarly released by a .disable() call-back.
Double requests/releases were avoided by a centrally handled usage count
mechanism.
This complexity can all be avoided by handling IO regions only once during
.probe() and .remove() of the parent device. Since this is the only
legitimate user of the aforementioned usage count mechanism, this patch
will allow it to be removed from MFD core in subsequent steps.
Suggested-by: Daniel Thompson <daniel.thompson@...aro.org>
Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
drivers/mfd/cs5535-mfd.c | 71 +++++++++++++++++-----------------------
1 file changed, 30 insertions(+), 41 deletions(-)
diff --git a/drivers/mfd/cs5535-mfd.c b/drivers/mfd/cs5535-mfd.c
index b35f1efa01f6..27fa8fa1ec9b 100644
--- a/drivers/mfd/cs5535-mfd.c
+++ b/drivers/mfd/cs5535-mfd.c
@@ -27,38 +27,6 @@ enum cs5535_mfd_bars {
NR_BARS,
};
-static int cs5535_mfd_res_enable(struct platform_device *pdev)
-{
- struct resource *res;
-
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- if (!res) {
- dev_err(&pdev->dev, "can't fetch device resource info\n");
- return -EIO;
- }
-
- if (!request_region(res->start, resource_size(res), DRV_NAME)) {
- dev_err(&pdev->dev, "can't request region\n");
- return -EIO;
- }
-
- return 0;
-}
-
-static int cs5535_mfd_res_disable(struct platform_device *pdev)
-{
- struct resource *res;
-
- res = platform_get_resource(pdev, IORESOURCE_IO, 0);
- if (!res) {
- dev_err(&pdev->dev, "can't fetch device resource info\n");
- return -EIO;
- }
-
- release_region(res->start, resource_size(res));
- return 0;
-}
-
static struct resource cs5535_mfd_resources[NR_BARS];
static struct mfd_cell cs5535_mfd_cells[] = {
@@ -81,17 +49,11 @@ static struct mfd_cell cs5535_mfd_cells[] = {
.name = "cs5535-pms",
.num_resources = 1,
.resources = &cs5535_mfd_resources[PMS_BAR],
-
- .enable = cs5535_mfd_res_enable,
- .disable = cs5535_mfd_res_disable,
},
{
.name = "cs5535-acpi",
.num_resources = 1,
.resources = &cs5535_mfd_resources[ACPI_BAR],
-
- .enable = cs5535_mfd_res_enable,
- .disable = cs5535_mfd_res_disable,
},
};
@@ -117,22 +79,47 @@ static int cs5535_mfd_probe(struct pci_dev *pdev,
r->end = pci_resource_end(pdev, bar);
}
+ err = pci_request_region(pdev, PMS_BAR, DRV_NAME);
+ if (err) {
+ dev_err(&pdev->dev, "Failed to request PMS_BAR's IO region\n");
+ goto err_disable;
+ }
+
err = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, cs5535_mfd_cells,
ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
if (err) {
dev_err(&pdev->dev,
"Failed to add CS5535 sub-devices: %d\n", err);
- goto err_disable;
+ goto err_release_pms;
}
- if (machine_is_olpc())
- mfd_clone_cell("cs5535-acpi", olpc_acpi_clones, ARRAY_SIZE(olpc_acpi_clones));
+ if (machine_is_olpc()) {
+ err = pci_request_region(pdev, ACPI_BAR, DRV_NAME);
+ if (err) {
+ dev_err(&pdev->dev,
+ "Failed to request ACPI_BAR's IO region\n");
+ goto err_remove_devices;
+ }
+
+ err = mfd_clone_cell("cs5535-acpi", olpc_acpi_clones,
+ ARRAY_SIZE(olpc_acpi_clones));
+ if (err) {
+ dev_err(&pdev->dev, "Failed to clone MFD cell\n");
+ goto err_release_acpi;
+ }
+ }
dev_info(&pdev->dev, "%zu devices registered.\n",
ARRAY_SIZE(cs5535_mfd_cells));
return 0;
+err_release_acpi:
+ pci_release_region(pdev, ACPI_BAR);
+err_remove_devices:
+ mfd_remove_devices(&pdev->dev);
+err_release_pms:
+ pci_release_region(pdev, PMS_BAR);
err_disable:
pci_disable_device(pdev);
return err;
@@ -141,6 +128,8 @@ static int cs5535_mfd_probe(struct pci_dev *pdev,
static void cs5535_mfd_remove(struct pci_dev *pdev)
{
mfd_remove_devices(&pdev->dev);
+ pci_release_region(pdev, ACPI_BAR);
+ pci_release_region(pdev, PMS_BAR);
pci_disable_device(pdev);
}
--
2.17.1
Powered by blists - more mailing lists