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Subject[RFC v3 1/7] platform/x86: intel_pmc_ipc: Use devm_* calls in driver probe function
Date
From: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>

This patch cleans up unnecessary free/alloc calls in ipc_plat_probe(),
ipc_pci_probe() and ipc_plat_get_res() functions by using devm_*
calls.

This patch also adds proper error handling for failure cases in
ipc_pci_probe() function.

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
drivers/platform/x86/intel_pmc_ipc.c | 104 ++++++++++++-----------------------
1 file changed, 34 insertions(+), 70 deletions(-)

Changes since v2:
* Used pcim_* device managed functions.

Changes since v1:
* Merged devm_* related changes into a single function.
* Instead of removing free_irq, use devm_free_irq function.

diff --git a/drivers/platform/x86/intel_pmc_ipc.c b/drivers/platform/x86/intel_pmc_ipc.c
index bb792a5..5eef649 100644
--- a/drivers/platform/x86/intel_pmc_ipc.c
+++ b/drivers/platform/x86/intel_pmc_ipc.c
@@ -480,52 +480,39 @@ static irqreturn_t ioc(int irq, void *dev_id)

static int ipc_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
{
- resource_size_t pci_resource;
int ret;
- int len;
+ struct intel_pmc_ipc_dev *pmc = &ipcdev;

- ipcdev.dev = &pci_dev_get(pdev)->dev;
- ipcdev.irq_mode = IPC_TRIGGER_MODE_IRQ;
+ /* Only one PMC is supported */
+ if (pmc->dev)
+ return -EBUSY;

- ret = pci_enable_device(pdev);
+ pmc->irq_mode = IPC_TRIGGER_MODE_IRQ;
+
+ ret = pcim_enable_device(pdev);
if (ret)
return ret;

- ret = pci_request_regions(pdev, "intel_pmc_ipc");
+ ret = pcim_iomap_regions(pdev, 1 << 0, pci_name(pdev));
if (ret)
return ret;

- pci_resource = pci_resource_start(pdev, 0);
- len = pci_resource_len(pdev, 0);
- if (!pci_resource || !len) {
- dev_err(&pdev->dev, "Failed to get resource\n");
- return -ENOMEM;
- }
+ init_completion(&pmc->cmd_complete);

- init_completion(&ipcdev.cmd_complete);
+ pmc->ipc_base = pcim_iomap_table(pdev)[0];

- if (request_irq(pdev->irq, ioc, 0, "intel_pmc_ipc", &ipcdev)) {
+ ret = devm_request_irq(&pdev->dev, pdev->irq, ioc, 0, "intel_pmc_ipc",
+ pmc);
+ if (ret) {
dev_err(&pdev->dev, "Failed to request irq\n");
- return -EBUSY;
+ return ret;
}

- ipcdev.ipc_base = ioremap_nocache(pci_resource, len);
- if (!ipcdev.ipc_base) {
- dev_err(&pdev->dev, "Failed to ioremap ipc base\n");
- free_irq(pdev->irq, &ipcdev);
- ret = -ENOMEM;
- }
+ pmc->dev = &pdev->dev;

- return ret;
-}
+ pci_set_drvdata(pdev, pmc);

-static void ipc_pci_remove(struct pci_dev *pdev)
-{
- free_irq(pdev->irq, &ipcdev);
- pci_release_regions(pdev);
- pci_dev_put(pdev);
- iounmap(ipcdev.ipc_base);
- ipcdev.dev = NULL;
+ return 0;
}

static const struct pci_device_id ipc_pci_ids[] = {
@@ -540,7 +527,6 @@ static struct pci_driver ipc_pci_driver = {
.name = "intel_pmc_ipc",
.id_table = ipc_pci_ids,
.probe = ipc_pci_probe,
- .remove = ipc_pci_remove,
};

static ssize_t intel_pmc_ipc_simple_cmd_store(struct device *dev,
@@ -849,18 +835,16 @@ static int ipc_plat_get_res(struct platform_device *pdev)
dev_err(&pdev->dev, "Failed to get ipc resource\n");
return -ENXIO;
}
- size = PLAT_RESOURCE_IPC_SIZE + PLAT_RESOURCE_GCR_SIZE;
+ res->end = (res->start + PLAT_RESOURCE_IPC_SIZE +
+ PLAT_RESOURCE_GCR_SIZE - 1);

- if (!request_mem_region(res->start, size, pdev->name)) {
- dev_err(&pdev->dev, "Failed to request ipc resource\n");
- return -EBUSY;
- }
- addr = ioremap_nocache(res->start, size);
- if (!addr) {
- dev_err(&pdev->dev, "I/O memory remapping failed\n");
- release_mem_region(res->start, size);
- return -ENOMEM;
+ addr = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(addr)) {
+ dev_err(&pdev->dev,
+ "PMC I/O memory remapping failed\n");
+ return PTR_ERR(addr);
}
+
ipcdev.ipc_base = addr;

ipcdev.gcr_mem_base = addr + PLAT_RESOURCE_GCR_OFFSET;
@@ -917,7 +901,6 @@ MODULE_DEVICE_TABLE(acpi, ipc_acpi_ids);

static int ipc_plat_probe(struct platform_device *pdev)
{
- struct resource *res;
int ret;

ipcdev.dev = &pdev->dev;
@@ -939,61 +922,42 @@ static int ipc_plat_probe(struct platform_device *pdev)
ret = ipc_create_pmc_devices();
if (ret) {
dev_err(&pdev->dev, "Failed to create pmc devices\n");
- goto err_device;
+ return ret;
}

- if (request_irq(ipcdev.irq, ioc, IRQF_NO_SUSPEND,
- "intel_pmc_ipc", &ipcdev)) {
+ if (devm_request_irq(&pdev->dev, ipcdev.irq, ioc, IRQF_NO_SUSPEND,
+ "intel_pmc_ipc", &ipcdev)) {
dev_err(&pdev->dev, "Failed to request irq\n");
ret = -EBUSY;
- goto err_irq;
+ goto unregister_devices;
}

ret = sysfs_create_group(&pdev->dev.kobj, &intel_ipc_group);
if (ret) {
dev_err(&pdev->dev, "Failed to create sysfs group %d\n",
ret);
- goto err_sys;
+ goto unregister_devices;
}

ipcdev.has_gcr_regs = true;

return 0;
-err_sys:
- free_irq(ipcdev.irq, &ipcdev);
-err_irq:
+
+unregister_devices:
platform_device_unregister(ipcdev.tco_dev);
platform_device_unregister(ipcdev.punit_dev);
platform_device_unregister(ipcdev.telemetry_dev);
-err_device:
- iounmap(ipcdev.ipc_base);
- res = platform_get_resource(pdev, IORESOURCE_MEM,
- PLAT_RESOURCE_IPC_INDEX);
- if (res) {
- release_mem_region(res->start,
- PLAT_RESOURCE_IPC_SIZE +
- PLAT_RESOURCE_GCR_SIZE);
- }
+
return ret;
}

static int ipc_plat_remove(struct platform_device *pdev)
{
- struct resource *res;
-
sysfs_remove_group(&pdev->dev.kobj, &intel_ipc_group);
- free_irq(ipcdev.irq, &ipcdev);
+ devm_free_irq(&pdev->dev, ipcdev.irq, &ipcdev);
platform_device_unregister(ipcdev.tco_dev);
platform_device_unregister(ipcdev.punit_dev);
platform_device_unregister(ipcdev.telemetry_dev);
- iounmap(ipcdev.ipc_base);
- res = platform_get_resource(pdev, IORESOURCE_MEM,
- PLAT_RESOURCE_IPC_INDEX);
- if (res) {
- release_mem_region(res->start,
- PLAT_RESOURCE_IPC_SIZE +
- PLAT_RESOURCE_GCR_SIZE);
- }
ipcdev.dev = NULL;
return 0;
}
--
2.7.4
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