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Fix the pddf_custom_wdt driver rarely reports kernel dump issue while reboot in belgite platform (#12322)

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Why I did it
SONiC will report the kernel dump while system reboot in Belgite platform as the following shows:

How I did it
Cause:

Invalid cdev container pointer from the inode is being accessing in misc
device open, which causes a memory corruption in the slub.
Because of the slub corruption, random crash is seen during reboot.
Fix: - Instead of cdev pointer from the inode, mdev container pointer is
used from the file->privdate_data member.

Action: update the pddf_custom_wdt driver,

How to verify it
Do the reboot stress test to check whether there is kernel dump during reboot progress
This commit is contained in:
jerseyang 2022-11-04 19:26:18 +08:00 committed by GitHub
parent d7a9f18d18
commit 7fb8bf7012
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 15 additions and 14 deletions
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29
platform/broadcom/sonic-platform-modules-cel/belgite/modules/pddf_custom_wdt.c
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@ -86,6 +86,7 @@ struct cpld_wdt_private {
struct platform_device *pdev;
struct watchdog_device wddev;
struct cdev cdev;
struct miscdevice mdev;
bool suspended;
struct wdt_data wdat;
};
@ -100,7 +101,7 @@ MODULE_PARM_DESC(timeout, "Start watchdog timer on module load with"
" Zero (default) disables this feature.");
static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0444);
module_param(nowayout, bool, 0644);
MODULE_PARM_DESC(nowayout, "Disable watchdog shutdown on close");
static unsigned int watchdog_get_timeleft(struct cpld_wdt_private *wdt)
@ -114,7 +115,7 @@ static unsigned int watchdog_get_timeleft(struct cpld_wdt_private *wdt)
time = time << 8 | inb(WDT_TIMER_L_BIT_REG);
time = time/1000;
mutex_unlock(&wdt->wdat.lock);
//pr_crit("Watchdog Get Timeleft:%u\n", time);
return time;
}
static int watchdog_get_timeout(struct cpld_wdt_private *wdt)
@ -175,7 +176,7 @@ static int watchdog_ping(struct cpld_wdt_private *wdt)
outb(WDT_START_FEED, WDT_FEED_REG);
/* stop feed watchdog */
outb(WDT_STOP_FEED, WDT_FEED_REG);
//pr_crit("Watchdog Ping\n");
mutex_unlock(&wdt->wdat.lock);
return 0;
@ -198,7 +199,7 @@ static void watchdog_keepalive(struct cpld_wdt_private *wdt)
val &= 0x1;
/* start feed watchdog */
outb(val, WDT_FEED_REG);
//pr_crit("Watchdog Keepalive\n");
mutex_unlock(&wdt->wdat.lock);
return;
}
@ -214,7 +215,7 @@ static int watchdog_start(struct cpld_wdt_private *wdt)
outb(WDT_ENABLE, WDT_ENABLE_REG);
outb(WDT_RESTART, WDT_PUNCH_REG);
mutex_unlock(&wdt->wdat.lock);
//pr_crit("Watchdog Start:Enable and PUNCH\n");
return 0;
}
@ -226,7 +227,7 @@ static int watchdog_stop(struct cpld_wdt_private *wdt)
mutex_lock(&wdt->wdat.lock);
outb(WDT_DISABLE, WDT_ENABLE_REG);
mutex_unlock(&wdt->wdat.lock);
//pr_crit("Watchdog Stop\n");
return 0;
}
@ -370,7 +371,7 @@ static int watchdog_open(struct inode *inode, struct file *file)
{
struct cpld_wdt_private *wdt;
wdt = container_of(inode->i_cdev, struct cpld_wdt_private, cdev);
wdt = container_of(file->private_data, struct cpld_wdt_private, mdev);
/* If the watchdog is alive we don't need to start it again */
@ -384,14 +385,14 @@ static int watchdog_open(struct inode *inode, struct file *file)
wdt->wdat.expect_close = 0;
file->private_data = wdt;
return nonseekable_open(inode, file);
}
static int watchdog_release(struct inode *inode, struct file *file)
{
struct cpld_wdt_private *p;
p = (struct cpld_wdt_private *)file->private_data;
p = container_of(file->private_data, struct cpld_wdt_private, mdev);
if(!p)
return -EINVAL;
@ -423,7 +424,7 @@ static ssize_t watchdog_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct cpld_wdt_private *p;
p = (struct cpld_wdt_private *)file->private_data;
p = container_of(file->private_data, struct cpld_wdt_private, mdev);
if(!p)
return -EINVAL;
@ -480,7 +481,7 @@ static long watchdog_ioctl(struct file *file, unsigned int cmd,
uarg.i = (int __user *)arg;
struct cpld_wdt_private *p;
p = (struct cpld_wdt_private *)file->private_data;
p = container_of(file->private_data, struct cpld_wdt_private, mdev);
if(!p)
return -EINVAL;
@ -627,8 +628,8 @@ static int cpld_wdt_probe(struct platform_device *pdev)
err = register_reboot_notifier(&watchdog_notifier);
if (err)
return err;
err = misc_register(&watchdog_miscdev);
p->mdev = watchdog_miscdev;
err = misc_register(&p->mdev);
if (err) {
pr_err("cannot register miscdev on minor=%d\n",
watchdog_miscdev.minor);
@ -672,7 +673,7 @@ static int cpld_wdt_remove(struct platform_device *pdev)
sysfs_remove_group(&pdev->dev.kobj, &wdt_group);
misc_deregister(&watchdog_miscdev);
misc_deregister(&p->mdev);
unregister_reboot_notifier(&watchdog_notifier);