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SubjectRe: [PATCH v5 3/4] SFH: Transport Driver to add support of AMD Sensor Fusion Hub (SFH
On Fri, May 29, 2020 at 4:43 PM Sandeep Singh <Sandeep.Singh@amd.com> wrote:
>
> From: Sandeep Singh <sandeep.singh@amd.com>
>
> This part of module will provide the interaction between HID framework
> and client driver.This modules will registered client driver with
> HID framework.

...

> Signed-off-by: Sandeep Singh <sandeep.singh@amd.com>
> Signed-off-by: Nehal Shah <Nehal-bakulchandra.Shah@amd.com>

Use proper sequence and Co-developed-by if applicable.

> Reported-by: kbuild test robot <lkp@intel.com>
> Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

What has been reported? Absence of the drivers?

...

> +#include <linux/init.h>
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/slab.h>
> +#include <linux/workqueue.h>
> +#include <linux/hid.h>
> +#include <linux/list.h>
> +#include <linux/platform_device.h>
> +#include <linux/acpi.h>
> +#include <linux/dma-mapping.h>

Keep ordered?

> +#include "amdsfh-hid.h"
> +#include "amd_mp2_pcie.h"
> +#include "hid_descriptor/amd_sfh_hid_descriptor.h"

...

> +void amd_sfh_get_report(struct hid_device *hid, int report_id,
> + int report_type)
> +{
> + struct amdtp_hid_data *hid_data = hid->driver_data;
> + struct amdtp_cl_data *cli_data = hid_data->cli_data;
> + int i;
> +
> + for (i = 0; i < cli_data->num_hid_devices; i++) {
> + if (cli_data->hid_sensor_hubs[i] == hid) {

> + struct request_list *new_request = kzalloc
> + (sizeof(*new_request), GFP_KERNEL);

Bad indentation.

> + new_request->current_index = i;

Huh? NULL pointer dereference!

> + new_request->sensor_idx = cli_data->sensor_idx[i];
> + new_request->hid = hid;
> + new_request->report_type = report_type;
> + new_request->report_id = report_id;
> + cli_data->report_id[i] = report_id;
> + cli_data->request_done[i] = false;
> + list_add(&new_request->list, &req_list.list);
> + break;
> + }
> + }
> + schedule_delayed_work(&cli_data->work, 0);
> +}
> +EXPORT_SYMBOL(amd_sfh_get_report);

...

> +static void amd_sfh_work_buffer(struct work_struct *work)
> +{
> + struct amdtp_cl_data *cli_data = cl_data_context;
> + unsigned int i;

> + u8 report_size = 0;

Redundant assignment.

> + for (i = 0; i < cli_data->num_hid_devices; i++) {
> + report_size = get_input_report(cli_data->sensor_idx[i],
> + cli_data->report_id[i],
> + cli_data->input_report[i],
> + cli_data->sensor_virt_addr[i]);
> + hid_input_report(cli_data->hid_sensor_hubs[i],
> + HID_INPUT_REPORT,
> + cli_data->input_report[i], report_size, 0);
> + }
> +
> + schedule_delayed_work(&cli_data->work_buffer, PERIOD);
> +}

...

> +static int amd_sfh_hid_client_probe(struct platform_device *pdev)
> +{
> + struct amd_mp2_sensor_info info;
> + int rc = 0;
> + int i;
> + struct amdtp_cl_device *cl_dev;
> + struct amdtp_cl_data *cl_data;
> + u32 feature_report_size = 0;
> + u32 input_report_size = 0;

Are you sure all those assignments are needed?

> + cl_dev->pdev = pci_get_device(PCI_VENDOR_ID_AMD,
> + PCI_DEVICE_ID_AMD_MP2, NULL);

I'm not quite sure you understand what you are doing here.
The code below is full of leak.

> + if (!cl_dev->pdev)

> + return -ENOMEM;

What?

...

> + cl_data = kzalloc(sizeof(*cl_data), GFP_KERNEL);

> + cl_data->num_hid_devices = amd_mp2_get_sensor_num
> + (cl_dev->pdev, &cl_data->sensor_idx[0]);

Strange indentation.
NULL pointer dereference!


> + for (i = 0; i < cl_data->num_hid_devices; i++) {

> + cl_data->sensor_virt_addr[i] = dma_alloc_coherent
> + (&cl_dev->pdev->dev, sizeof(int) * 8,
> + &cl_data->sensor_phy_addr[i], GFP_KERNEL);

Indentation.

> + cl_data->report_descr_size[i] = get_descriptor_size
> + (cl_data->sensor_idx[i], descr_size);
> +
> + feature_report_size = get_descriptor_size
> + (cl_data->sensor_idx[i], feature_size);
> +
> + input_report_size = get_descriptor_size
> + (cl_data->sensor_idx[i], input_size);

Ditto.

> + cl_data->feature_report[i] = kzalloc(feature_report_size,
> + GFP_KERNEL);
> + cl_data->input_report[i] = kzalloc(input_report_size,
> + GFP_KERNEL);

NULL pointer dereference.

You probably need to understand how memory allocation and heap usage works.

> + info.period = PERIOD;
> + info.sensor_idx = cl_data->sensor_idx[i];
> + info.phy_address = cl_data->sensor_phy_addr[i];

> + cl_data->report_descr[i] = kzalloc
> + (cl_data->report_descr_size[i], GFP_KERNEL);

Indentation.

> + if (!cl_data->report_descr[i])
> + return -ENOMEM;
> + rc = get_report_descriptor(cl_data->sensor_idx[i],
> + cl_data->report_descr[i]);
> + rc = amdtp_hid_probe(cl_data->cur_hid_dev, cl_data);
> + amd_start_sensor(cl_dev->pdev, info);
> + cl_data->sensor_sts[i] = 1;
> + }
> +
> + cl_dev->cl_data = cl_data;
> + cl_data_context = cl_data;
> + platform_set_drvdata(pdev, cl_dev);
> + schedule_delayed_work(&cl_data->work_buffer, PERIOD);
> + return 0;
> +}

...

> +static int amd_sfh_hid_client_remove(struct platform_device *pdev)
> +{
> + int i;
> + struct amdtp_cl_device *cl_dev;
> + struct amdtp_cl_data *cl_data;

Reversed xmas tree, please.

> + cl_dev = platform_get_drvdata(pdev);

> + if (!(cl_dev))
> + return -EINVAL;

When this will be true?!

This can be done directly in the definition block above.

> + cl_data = cl_dev->cl_data;

> + if (!(cl_data))
> + return -EINVAL;

Ditto.

> + for (i = 0; i < cl_data->num_hid_devices; i++)
> + amd_stop_sensor(cl_dev->pdev, i);
> +
> + cancel_delayed_work_sync(&cl_data->work);
> + cancel_delayed_work_sync(&cl_data->work_buffer);
> + amdtp_hid_remove(cl_data);
> +
> + for (i = 0; i < cl_data->num_hid_devices; i++) {
> + if (cl_data->sensor_virt_addr[i])
> + dma_free_coherent(&cl_dev->pdev->dev, 8 * sizeof(int),
> + cl_data->sensor_virt_addr[i],
> + cl_data->sensor_phy_addr[i]);
> + }
> +

> + kfree(cl_data);

Why not devm in the probe and nothing here?

> + pr_info("%s:%s Exit\n", DRIVER_NAME, __func__);

No, no. Remove this noise.

> + return 0;
> +}

...

> +static const struct acpi_device_id amd_sfh_acpi_match[] = { {
> + "AMDI0080" },

> + { },

No comma on terminators.

> +};

Indentation is horrible. You have to look into existing drivers
(better newer ones) to see how to have done things like this.

> +

Blank line in wrong place...

> +MODULE_DEVICE_TABLE(acpi, amd_sfh_acpi_match);

...should be here.

> +static struct platform_driver amd_sfh_plat_driver = {
> + .probe = amd_sfh_hid_client_probe,
> + .remove = amd_sfh_hid_client_remove,
> + .driver = {
> + .name = "amd_sfh_platform",

> + .acpi_match_table = ACPI_PTR(amd_sfh_acpi_match),

ACPI_PTR() is redundant and/or provokes compilation warnings.

> + },
> +};
> +module_platform_driver(amd_sfh_plat_driver);

+ blank line.

...

> +static int amdtp_hid_parse(struct hid_device *hid)
> +{
> + struct amdtp_hid_data *hid_data = hid->driver_data;
> + struct amdtp_cl_data *cli_data = hid_data->cli_data;

> + int rc;
> +
> + rc = hid_parse_report(hid, cli_data->report_descr[hid_data->index],
> + cli_data->report_descr_size[hid_data->index]);
> + if (rc)
> + return rc;
> + return 0;

return hid_parse_report(...);

> +}

...

> +static void amdtp_hid_request(struct hid_device *hid, struct hid_report *rep,
> + int reqtype)
> +{
> + switch (reqtype) {
> + case HID_REQ_GET_REPORT:
> + amd_sfh_get_report(hid, rep->id, rep->type);
> + break;
> + case HID_REQ_SET_REPORT:
> + amd_sfh_set_report(hid, rep->id, reqtype);
> + break;
> + }

default?

> +}

...

> +static int amdtp_wait_for_response(struct hid_device *hid)
> +{
> + struct amdtp_hid_data *hid_data = hid->driver_data;
> + struct amdtp_cl_data *cli_data = hid_data->cli_data;
> + int i = 0;
> +
> + for (i = 0; i < cli_data->num_hid_devices; i++) {
> + if (cli_data->hid_sensor_hubs[i] == hid)
> + break;
> + }
> + if (!cli_data->request_done[i])
> + wait_event_interruptible_timeout(hid_data->hid_wait,
> + cli_data->request_done[i],
> + 1500);

> + if (!cli_data->request_done[i]) {

Shouldn't you rather check returned value from previous call?

> + hid_err(hid,
> + "timeout waiting for response from device\n");
> + return -ETIMEDOUT;
> + }
> + cli_data->request_done[i] = false;
> +
> + return 0;
> +}

...

> + hid = hid_allocate_device();
> + if (IS_ERR(hid)) {

> + rc = PTR_ERR(hid);
> + return -ENOMEM;

Huh?!

> + }

...


> +#ifndef AMDSFH_HID_H
> +#define AMDSFH_HID_H

> +#include <linux/debugfs.h>

What?! I see useds of other stuff, but this...

--
With Best Regards,
Andy Shevchenko

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