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tuxedo_keyboard: Fix possible race condition on driver init

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Modified patch from https://github.com/ftufo

https://github.com/tuxedocomputers/tuxedo-keyboard/issues/75
This commit is contained in:
Christoffer Sandberg 2021-03-15 11:30:45 +01:00
parent 852c28cec4
commit f4622e28f1
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GPG key ID: BF563F71B6C7A96D
1 changed files with 37 additions and 29 deletions
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34
src/tuxedo_keyboard.c
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@ -21,6 +21,7 @@
#include "tuxedo_keyboard_common.h" #include "tuxedo_keyboard_common.h"
#include "clevo_keyboard.h" #include "clevo_keyboard.h"
#include "uniwill_keyboard.h" #include "uniwill_keyboard.h"
#include <linux/mutex.h>
MODULE_AUTHOR("TUXEDO Computers GmbH <tux@tuxedocomputers.com>"); MODULE_AUTHOR("TUXEDO Computers GmbH <tux@tuxedocomputers.com>");
MODULE_DESCRIPTION("TUXEDO Computers keyboard & keyboard backlight Driver"); MODULE_DESCRIPTION("TUXEDO Computers keyboard & keyboard backlight Driver");
@ -33,6 +34,8 @@ MODULE_ALIAS("wmi:" UNIWILL_WMI_EVENT_GUID_2);
MODULE_SOFTDEP("pre: tuxedo-cc-wmi"); MODULE_SOFTDEP("pre: tuxedo-cc-wmi");
static DEFINE_MUTEX(tuxedo_keyboard_init_driver_lock);
static struct tuxedo_keyboard_driver *driver_list[] = { static struct tuxedo_keyboard_driver *driver_list[] = {
&uniwill_keyboard_driver &uniwill_keyboard_driver
}; };
@ -79,20 +82,22 @@ struct platform_device *tuxedo_keyboard_init_driver(struct tuxedo_keyboard_drive
int err; int err;
TUXEDO_DEBUG("init driver start\n"); TUXEDO_DEBUG("init driver start\n");
// If already initiated don't do anything further mutex_lock(&tuxedo_keyboard_init_driver_lock);
if (!IS_ERR_OR_NULL(tuxedo_platform_device)) { if (!IS_ERR_OR_NULL(tuxedo_platform_device)) {
return tuxedo_platform_device; // If already initialized, don't proceed
} TUXEDO_DEBUG("platform device already initialized\n");
goto init_driver_exit;
} else {
// Otherwise, attempt to initialize structures
TUXEDO_DEBUG("create platform bundle\n"); TUXEDO_DEBUG("create platform bundle\n");
tuxedo_platform_device = platform_create_bundle( tuxedo_platform_device = platform_create_bundle(
tk_driver->platform_driver, tk_driver->probe, NULL, 0, NULL, 0); tk_driver->platform_driver, tk_driver->probe, NULL, 0, NULL, 0);
if (IS_ERR_OR_NULL(tuxedo_platform_device)) if (IS_ERR_OR_NULL(tuxedo_platform_device)) {
return tuxedo_platform_device; // Normal case probe failed, no init
goto init_driver_exit;
TUXEDO_DEBUG("platform device created\n"); }
TUXEDO_DEBUG("initialize input device\n"); TUXEDO_DEBUG("initialize input device\n");
if (tk_driver->key_map != NULL) { if (tk_driver->key_map != NULL) {
@ -107,7 +112,10 @@ struct platform_device *tuxedo_keyboard_init_driver(struct tuxedo_keyboard_drive
} }
current_driver = tk_driver; current_driver = tk_driver;
}
init_driver_exit:
mutex_unlock(&tuxedo_keyboard_init_driver_lock);
return tuxedo_platform_device; return tuxedo_platform_device;
} }
EXPORT_SYMBOL(tuxedo_keyboard_init_driver); EXPORT_SYMBOL(tuxedo_keyboard_init_driver);
@ -124,7 +132,7 @@ static void __exit tuxedo_input_exit(void)
} }
} }
static int __init tuxdeo_keyboard_init(void) static int __init tuxedo_keyboard_init(void)
{ {
int i; int i;
int num_drivers = sizeof(driver_list) / sizeof(*driver_list); int num_drivers = sizeof(driver_list) / sizeof(*driver_list);
@ -150,7 +158,7 @@ static int __init tuxdeo_keyboard_init(void)
return 0; return 0;
} }
static void __exit tuxdeo_keyboard_exit(void) static void __exit tuxedo_keyboard_exit(void)
{ {
TUXEDO_DEBUG("tuxedo_input_exit()\n"); TUXEDO_DEBUG("tuxedo_input_exit()\n");
tuxedo_input_exit(); tuxedo_input_exit();
@ -164,5 +172,5 @@ static void __exit tuxdeo_keyboard_exit(void)
TUXEDO_DEBUG("exit\n"); TUXEDO_DEBUG("exit\n");
} }
module_init(tuxdeo_keyboard_init); module_init(tuxedo_keyboard_init);
module_exit(tuxdeo_keyboard_exit); module_exit(tuxedo_keyboard_exit);