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SubjectRe: [PATCH 19/30] platform/x86: Use kmemdup rather than duplicating its implementation
On Wed, Jul 3, 2019 at 4:19 PM Fuqian Huang <huangfq.daxian@gmail.com> wrote:
>
> kmemdup is introduced to duplicate a region of memory in a neat way.
> Rather than kmalloc/kzalloc + memset, which the programmer needs to
> write the size twice (sometimes lead to mistakes), kmemdup improves
> readability, leads to smaller code and also reduce the chances of mistakes.
> Suggestion to use kmemdup rather than using kmalloc/kzalloc + memset.
>

Please, split on driver basis and use correct prefix.

> Signed-off-by: Fuqian Huang <huangfq.daxian@gmail.com>
> ---
> drivers/platform/x86/asus-wmi.c | 3 +--
> drivers/platform/x86/thinkpad_acpi.c | 17 +++++++----------
> 2 files changed, 8 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/platform/x86/asus-wmi.c b/drivers/platform/x86/asus-wmi.c
> index 9b18a184e0aa..472b317ad814 100644
> --- a/drivers/platform/x86/asus-wmi.c
> +++ b/drivers/platform/x86/asus-wmi.c
> @@ -260,12 +260,11 @@ static int asus_wmi_evaluate_method_agfn(const struct acpi_buffer args)
> * Copy to dma capable address otherwise memory corruption occurs as
> * bios has to be able to access it.
> */
> - input.pointer = kzalloc(args.length, GFP_DMA | GFP_KERNEL);
> + input.pointer = kmemdup(args.pointer, args.length, GFP_DMA | GFP_KERNEL);
> input.length = args.length;
> if (!input.pointer)
> return -ENOMEM;
> phys_addr = virt_to_phys(input.pointer);
> - memcpy(input.pointer, args.pointer, args.length);
>
> status = asus_wmi_evaluate_method(ASUS_WMI_METHODID_AGFN,
> phys_addr, 0, &retval);
> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> index 7bde4640ef34..d379bdf98a0f 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -3647,22 +3647,19 @@ static int __init hotkey_init(struct ibm_init_struct *iibm)
> goto err_exit;
>
> /* Set up key map */
> - hotkey_keycode_map = kmalloc(TPACPI_HOTKEY_MAP_SIZE,
> - GFP_KERNEL);
> - if (!hotkey_keycode_map) {
> - pr_err("failed to allocate memory for key map\n");
> - res = -ENOMEM;
> - goto err_exit;
> - }
> -
> keymap_id = tpacpi_check_quirks(tpacpi_keymap_qtable,
> ARRAY_SIZE(tpacpi_keymap_qtable));
> BUG_ON(keymap_id >= ARRAY_SIZE(tpacpi_keymaps));
> dbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_HKEY,
> "using keymap number %lu\n", keymap_id);
>
> - memcpy(hotkey_keycode_map, &tpacpi_keymaps[keymap_id],
> - TPACPI_HOTKEY_MAP_SIZE);
> + hotkey_keycode_map = kmemdup(&tpacpi_keymaps[keymap_id],
> + TPACPI_HOTKEY_MAP_SIZE, GFP_KERNEL);
> + if (!hotkey_keycode_map) {
> + pr_err("failed to allocate memory for key map\n");
> + res = -ENOMEM;
> + goto err_exit;
> + }
>
> input_set_capability(tpacpi_inputdev, EV_MSC, MSC_SCAN);
> tpacpi_inputdev->keycodesize = TPACPI_HOTKEY_MAP_TYPESIZE;
> --
> 2.11.0
>


--
With Best Regards,
Andy Shevchenko

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