Re: [PATCH v2] platform/x86: dell-laptop: Allocate buffer on heap rather than globally

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On Wed, Jan 31, 2018 at 7:47 PM, Mario Limonciello
<mario.limonciello@xxxxxxxx> wrote:
> There is no longer a need for the buffer to be defined in
> first 4GB physical address space.
>
> Furthermore there may be race conditions with multiple different functions
> working on a module wide buffer causing incorrect results.
>

Pushed to my review and testing queue, thanks!

> Fixes: 549b4930f057658dc50d8010e66219233119a4d8
> Suggested-by: Pali Rohar <pali.rohar@xxxxxxxxx>
> Signed-off-by: Mario Limonciello <mario.limonciello@xxxxxxxx>
> ---
>  drivers/platform/x86/dell-laptop.c | 188 ++++++++++++++++++++-----------------
>  1 file changed, 103 insertions(+), 85 deletions(-)
>
> diff --git a/drivers/platform/x86/dell-laptop.c b/drivers/platform/x86/dell-laptop.c
> index fc2dfc8..a7b1419 100644
> --- a/drivers/platform/x86/dell-laptop.c
> +++ b/drivers/platform/x86/dell-laptop.c
> @@ -78,7 +78,6 @@ static struct platform_driver platform_driver = {
>         }
>  };
>
> -static struct calling_interface_buffer *buffer;
>  static struct platform_device *platform_device;
>  static struct backlight_device *dell_backlight_device;
>  static struct rfkill *wifi_rfkill;
> @@ -322,7 +321,8 @@ static const struct dmi_system_id dell_quirks[] __initconst = {
>         { }
>  };
>
> -static void dell_set_arguments(u32 arg0, u32 arg1, u32 arg2, u32 arg3)
> +static void dell_fill_request(struct calling_interface_buffer *buffer,
> +                              u32 arg0, u32 arg1, u32 arg2, u32 arg3)
>  {
>         memset(buffer, 0, sizeof(struct calling_interface_buffer));
>         buffer->input[0] = arg0;
> @@ -331,7 +331,8 @@ static void dell_set_arguments(u32 arg0, u32 arg1, u32 arg2, u32 arg3)
>         buffer->input[3] = arg3;
>  }
>
> -static int dell_send_request(u16 class, u16 select)
> +static int dell_send_request(struct calling_interface_buffer *buffer,
> +                            u16 class, u16 select)
>  {
>         int ret;
>
> @@ -468,21 +469,22 @@ static int dell_rfkill_set(void *data, bool blocked)
>         int disable = blocked ? 1 : 0;
>         unsigned long radio = (unsigned long)data;
>         int hwswitch_bit = (unsigned long)data - 1;
> +       struct calling_interface_buffer buffer;
>         int hwswitch;
>         int status;
>         int ret;
>
> -       dell_set_arguments(0, 0, 0, 0);
> -       ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> +       dell_fill_request(&buffer, 0, 0, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
>         if (ret)
>                 return ret;
> -       status = buffer->output[1];
> +       status = buffer.output[1];
>
> -       dell_set_arguments(0x2, 0, 0, 0);
> -       ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> +       dell_fill_request(&buffer, 0x2, 0, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
>         if (ret)
>                 return ret;
> -       hwswitch = buffer->output[1];
> +       hwswitch = buffer.output[1];
>
>         /* If the hardware switch controls this radio, and the hardware
>            switch is disabled, always disable the radio */
> @@ -490,8 +492,8 @@ static int dell_rfkill_set(void *data, bool blocked)
>             (status & BIT(0)) && !(status & BIT(16)))
>                 disable = 1;
>
> -       dell_set_arguments(1 | (radio<<8) | (disable << 16), 0, 0, 0);
> -       ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> +       dell_fill_request(&buffer, 1 | (radio<<8) | (disable << 16), 0, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
>         return ret;
>  }
>
> @@ -500,9 +502,11 @@ static void dell_rfkill_update_sw_state(struct rfkill *rfkill, int radio,
>  {
>         if (status & BIT(0)) {
>                 /* Has hw-switch, sync sw_state to BIOS */
> +               struct calling_interface_buffer buffer;
>                 int block = rfkill_blocked(rfkill);
> -               dell_set_arguments(1 | (radio << 8) | (block << 16), 0, 0, 0);
> -               dell_send_request(CLASS_INFO, SELECT_RFKILL);
> +               dell_fill_request(&buffer,
> +                                  1 | (radio << 8) | (block << 16), 0, 0, 0);
> +               dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
>         } else {
>                 /* No hw-switch, sync BIOS state to sw_state */
>                 rfkill_set_sw_state(rfkill, !!(status & BIT(radio + 16)));
> @@ -519,21 +523,22 @@ static void dell_rfkill_update_hw_state(struct rfkill *rfkill, int radio,
>  static void dell_rfkill_query(struct rfkill *rfkill, void *data)
>  {
>         int radio = ((unsigned long)data & 0xF);
> +       struct calling_interface_buffer buffer;
>         int hwswitch;
>         int status;
>         int ret;
>
> -       dell_set_arguments(0, 0, 0, 0);
> -       ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> -       status = buffer->output[1];
> +       dell_fill_request(&buffer, 0, 0, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
> +       status = buffer.output[1];
>
>         if (ret != 0 || !(status & BIT(0))) {
>                 return;
>         }
>
> -       dell_set_arguments(0, 0x2, 0, 0);
> -       ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> -       hwswitch = buffer->output[1];
> +       dell_fill_request(&buffer, 0, 0x2, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
> +       hwswitch = buffer.output[1];
>
>         if (ret != 0)
>                 return;
> @@ -550,22 +555,23 @@ static struct dentry *dell_laptop_dir;
>
>  static int dell_debugfs_show(struct seq_file *s, void *data)
>  {
> +       struct calling_interface_buffer buffer;
>         int hwswitch_state;
>         int hwswitch_ret;
>         int status;
>         int ret;
>
> -       dell_set_arguments(0, 0, 0, 0);
> -       ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> +       dell_fill_request(&buffer, 0, 0, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
>         if (ret)
>                 return ret;
> -       status = buffer->output[1];
> +       status = buffer.output[1];
>
> -       dell_set_arguments(0, 0x2, 0, 0);
> -       hwswitch_ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> +       dell_fill_request(&buffer, 0, 0x2, 0, 0);
> +       hwswitch_ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
>         if (hwswitch_ret)
>                 return hwswitch_ret;
> -       hwswitch_state = buffer->output[1];
> +       hwswitch_state = buffer.output[1];
>
>         seq_printf(s, "return:\t%d\n", ret);
>         seq_printf(s, "status:\t0x%X\n", status);
> @@ -646,22 +652,23 @@ static const struct file_operations dell_debugfs_fops = {
>
>  static void dell_update_rfkill(struct work_struct *ignored)
>  {
> +       struct calling_interface_buffer buffer;
>         int hwswitch = 0;
>         int status;
>         int ret;
>
> -       dell_set_arguments(0, 0, 0, 0);
> -       ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> -       status = buffer->output[1];
> +       dell_fill_request(&buffer, 0, 0, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
> +       status = buffer.output[1];
>
>         if (ret != 0)
>                 return;
>
> -       dell_set_arguments(0, 0x2, 0, 0);
> -       ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> +       dell_fill_request(&buffer, 0, 0x2, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
>
>         if (ret == 0 && (status & BIT(0)))
> -               hwswitch = buffer->output[1];
> +               hwswitch = buffer.output[1];
>
>         if (wifi_rfkill) {
>                 dell_rfkill_update_hw_state(wifi_rfkill, 1, status, hwswitch);
> @@ -719,6 +726,7 @@ static struct notifier_block dell_laptop_rbtn_notifier = {
>
>  static int __init dell_setup_rfkill(void)
>  {
> +       struct calling_interface_buffer buffer;
>         int status, ret, whitelisted;
>         const char *product;
>
> @@ -734,9 +742,9 @@ static int __init dell_setup_rfkill(void)
>         if (!force_rfkill && !whitelisted)
>                 return 0;
>
> -       dell_set_arguments(0, 0, 0, 0);
> -       ret = dell_send_request(CLASS_INFO, SELECT_RFKILL);
> -       status = buffer->output[1];
> +       dell_fill_request(&buffer, 0, 0, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_INFO, SELECT_RFKILL);
> +       status = buffer.output[1];
>
>         /* dell wireless info smbios call is not supported */
>         if (ret != 0)
> @@ -889,6 +897,7 @@ static void dell_cleanup_rfkill(void)
>
>  static int dell_send_intensity(struct backlight_device *bd)
>  {
> +       struct calling_interface_buffer buffer;
>         struct calling_interface_token *token;
>         int ret;
>
> @@ -896,17 +905,21 @@ static int dell_send_intensity(struct backlight_device *bd)
>         if (!token)
>                 return -ENODEV;
>
> -       dell_set_arguments(token->location, bd->props.brightness, 0, 0);
> +       dell_fill_request(&buffer,
> +                          token->location, bd->props.brightness, 0, 0);
>         if (power_supply_is_system_supplied() > 0)
> -               ret = dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
> +               ret = dell_send_request(&buffer,
> +                                       CLASS_TOKEN_WRITE, SELECT_TOKEN_AC);
>         else
> -               ret = dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
> +               ret = dell_send_request(&buffer,
> +                                       CLASS_TOKEN_WRITE, SELECT_TOKEN_BAT);
>
>         return ret;
>  }
>
>  static int dell_get_intensity(struct backlight_device *bd)
>  {
> +       struct calling_interface_buffer buffer;
>         struct calling_interface_token *token;
>         int ret;
>
> @@ -914,14 +927,17 @@ static int dell_get_intensity(struct backlight_device *bd)
>         if (!token)
>                 return -ENODEV;
>
> -       dell_set_arguments(token->location, 0, 0, 0);
> +       dell_fill_request(&buffer, token->location, 0, 0, 0);
>         if (power_supply_is_system_supplied() > 0)
> -               ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_AC);
> +               ret = dell_send_request(&buffer,
> +                                       CLASS_TOKEN_READ, SELECT_TOKEN_AC);
>         else
> -               ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
> +               ret = dell_send_request(&buffer,
> +                                       CLASS_TOKEN_READ, SELECT_TOKEN_BAT);
>
>         if (ret == 0)
> -               ret = buffer->output[1];
> +               ret = buffer.output[1];
> +
>         return ret;
>  }
>
> @@ -1186,31 +1202,33 @@ static enum led_brightness kbd_led_level;
>
>  static int kbd_get_info(struct kbd_info *info)
>  {
> +       struct calling_interface_buffer buffer;
>         u8 units;
>         int ret;
>
> -       dell_set_arguments(0, 0, 0, 0);
> -       ret = dell_send_request(CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
> +       dell_fill_request(&buffer, 0, 0, 0, 0);
> +       ret = dell_send_request(&buffer,
> +                               CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
>         if (ret)
>                 return ret;
>
> -       info->modes = buffer->output[1] & 0xFFFF;
> -       info->type = (buffer->output[1] >> 24) & 0xFF;
> -       info->triggers = buffer->output[2] & 0xFF;
> -       units = (buffer->output[2] >> 8) & 0xFF;
> -       info->levels = (buffer->output[2] >> 16) & 0xFF;
> +       info->modes = buffer.output[1] & 0xFFFF;
> +       info->type = (buffer.output[1] >> 24) & 0xFF;
> +       info->triggers = buffer.output[2] & 0xFF;
> +       units = (buffer.output[2] >> 8) & 0xFF;
> +       info->levels = (buffer.output[2] >> 16) & 0xFF;
>
>         if (quirks && quirks->kbd_led_levels_off_1 && info->levels)
>                 info->levels--;
>
>         if (units & BIT(0))
> -               info->seconds = (buffer->output[3] >> 0) & 0xFF;
> +               info->seconds = (buffer.output[3] >> 0) & 0xFF;
>         if (units & BIT(1))
> -               info->minutes = (buffer->output[3] >> 8) & 0xFF;
> +               info->minutes = (buffer.output[3] >> 8) & 0xFF;
>         if (units & BIT(2))
> -               info->hours = (buffer->output[3] >> 16) & 0xFF;
> +               info->hours = (buffer.output[3] >> 16) & 0xFF;
>         if (units & BIT(3))
> -               info->days = (buffer->output[3] >> 24) & 0xFF;
> +               info->days = (buffer.output[3] >> 24) & 0xFF;
>
>         return ret;
>  }
> @@ -1270,31 +1288,34 @@ static int kbd_set_level(struct kbd_state *state, u8 level)
>
>  static int kbd_get_state(struct kbd_state *state)
>  {
> +       struct calling_interface_buffer buffer;
>         int ret;
>
> -       dell_set_arguments(0x1, 0, 0, 0);
> -       ret = dell_send_request(CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
> +       dell_fill_request(&buffer, 0, 0, 0, 0);
> +       ret = dell_send_request(&buffer,
> +                               CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
>         if (ret)
>                 return ret;
>
> -       state->mode_bit = ffs(buffer->output[1] & 0xFFFF);
> +       state->mode_bit = ffs(buffer.output[1] & 0xFFFF);
>         if (state->mode_bit != 0)
>                 state->mode_bit--;
>
> -       state->triggers = (buffer->output[1] >> 16) & 0xFF;
> -       state->timeout_value = (buffer->output[1] >> 24) & 0x3F;
> -       state->timeout_unit = (buffer->output[1] >> 30) & 0x3;
> -       state->als_setting = buffer->output[2] & 0xFF;
> -       state->als_value = (buffer->output[2] >> 8) & 0xFF;
> -       state->level = (buffer->output[2] >> 16) & 0xFF;
> -       state->timeout_value_ac = (buffer->output[2] >> 24) & 0x3F;
> -       state->timeout_unit_ac = (buffer->output[2] >> 30) & 0x3;
> +       state->triggers = (buffer.output[1] >> 16) & 0xFF;
> +       state->timeout_value = (buffer.output[1] >> 24) & 0x3F;
> +       state->timeout_unit = (buffer.output[1] >> 30) & 0x3;
> +       state->als_setting = buffer.output[2] & 0xFF;
> +       state->als_value = (buffer.output[2] >> 8) & 0xFF;
> +       state->level = (buffer.output[2] >> 16) & 0xFF;
> +       state->timeout_value_ac = (buffer.output[2] >> 24) & 0x3F;
> +       state->timeout_unit_ac = (buffer.output[2] >> 30) & 0x3;
>
>         return ret;
>  }
>
>  static int kbd_set_state(struct kbd_state *state)
>  {
> +       struct calling_interface_buffer buffer;
>         int ret;
>         u32 input1;
>         u32 input2;
> @@ -1307,8 +1328,9 @@ static int kbd_set_state(struct kbd_state *state)
>         input2 |= (state->level & 0xFF) << 16;
>         input2 |= (state->timeout_value_ac & 0x3F) << 24;
>         input2 |= (state->timeout_unit_ac & 0x3) << 30;
> -       dell_set_arguments(0x2, input1, input2, 0);
> -       ret = dell_send_request(CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
> +       dell_fill_request(&buffer, 0x2, input1, input2, 0);
> +       ret = dell_send_request(&buffer,
> +                               CLASS_KBD_BACKLIGHT, SELECT_KBD_BACKLIGHT);
>
>         return ret;
>  }
> @@ -1335,6 +1357,7 @@ static int kbd_set_state_safe(struct kbd_state *state, struct kbd_state *old)
>
>  static int kbd_set_token_bit(u8 bit)
>  {
> +       struct calling_interface_buffer buffer;
>         struct calling_interface_token *token;
>         int ret;
>
> @@ -1345,14 +1368,15 @@ static int kbd_set_token_bit(u8 bit)
>         if (!token)
>                 return -EINVAL;
>
> -       dell_set_arguments(token->location, token->value, 0, 0);
> -       ret = dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
> +       dell_fill_request(&buffer, token->location, token->value, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
>
>         return ret;
>  }
>
>  static int kbd_get_token_bit(u8 bit)
>  {
> +       struct calling_interface_buffer buffer;
>         struct calling_interface_token *token;
>         int ret;
>         int val;
> @@ -1364,9 +1388,9 @@ static int kbd_get_token_bit(u8 bit)
>         if (!token)
>                 return -EINVAL;
>
> -       dell_set_arguments(token->location, 0, 0, 0);
> -       ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_STD);
> -       val = buffer->output[1];
> +       dell_fill_request(&buffer, token->location, 0, 0, 0);
> +       ret = dell_send_request(&buffer, CLASS_TOKEN_READ, SELECT_TOKEN_STD);
> +       val = buffer.output[1];
>
>         if (ret)
>                 return ret;
> @@ -2102,6 +2126,7 @@ static struct notifier_block dell_laptop_notifier = {
>
>  int dell_micmute_led_set(int state)
>  {
> +       struct calling_interface_buffer buffer;
>         struct calling_interface_token *token;
>
>         if (state == 0)
> @@ -2114,8 +2139,8 @@ int dell_micmute_led_set(int state)
>         if (!token)
>                 return -ENODEV;
>
> -       dell_set_arguments(token->location, token->value, 0, 0);
> -       dell_send_request(CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
> +       dell_fill_request(&buffer, token->location, token->value, 0, 0);
> +       dell_send_request(&buffer, CLASS_TOKEN_WRITE, SELECT_TOKEN_STD);
>
>         return state;
>  }
> @@ -2146,13 +2171,6 @@ static int __init dell_init(void)
>         if (ret)
>                 goto fail_platform_device2;
>
> -       buffer = kzalloc(sizeof(struct calling_interface_buffer), GFP_KERNEL);
> -       if (!buffer) {
> -               ret = -ENOMEM;
> -               goto fail_buffer;
> -       }
> -
> -
>         ret = dell_setup_rfkill();
>
>         if (ret) {
> @@ -2177,10 +2195,13 @@ static int __init dell_init(void)
>
>         token = dell_smbios_find_token(BRIGHTNESS_TOKEN);
>         if (token) {
> -               dell_set_arguments(token->location, 0, 0, 0);
> -               ret = dell_send_request(CLASS_TOKEN_READ, SELECT_TOKEN_AC);
> +               struct calling_interface_buffer buffer;
> +
> +               dell_fill_request(&buffer, token->location, 0, 0, 0);
> +               ret = dell_send_request(&buffer,
> +                                       CLASS_TOKEN_READ, SELECT_TOKEN_AC);
>                 if (ret)
> -                       max_intensity = buffer->output[3];
> +                       max_intensity = buffer.output[3];
>         }
>
>         if (max_intensity) {
> @@ -2214,8 +2235,6 @@ static int __init dell_init(void)
>  fail_get_brightness:
>         backlight_device_unregister(dell_backlight_device);
>  fail_backlight:
> -       kfree(buffer);
> -fail_buffer:
>         dell_cleanup_rfkill();
>  fail_rfkill:
>         platform_device_del(platform_device);
> @@ -2235,7 +2254,6 @@ static void __exit dell_exit(void)
>                 touchpad_led_exit();
>         kbd_led_exit();
>         backlight_device_unregister(dell_backlight_device);
> -       kfree(buffer);
>         dell_cleanup_rfkill();
>         if (platform_device) {
>                 platform_device_unregister(platform_device);
> --
> 2.7.4
>



-- 
With Best Regards,
Andy Shevchenko



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