ipmi: use vzalloc instead of kmalloc for user creation

We met mulitple times of failure of staring bmc-watchdog,
due to the runtime memory allocation failure of order 4.

     bmc-watchdog: page allocation failure: order:4, mode:0x40cc0(GFP_KERNEL|__GFP_COMP), nodemask=(null),cpuset=/,mems_allowed=0-1
     CPU: 1 PID: 2571 Comm: bmc-watchdog Not tainted 5.5.0-00045-g7d6bb61d6188c #1
     Hardware name: Intel Corporation S2600WFT/S2600WFT, BIOS SE5C620.86B.00.01.0015.110720180833 11/07/2018
     Call Trace:
      dump_stack+0x66/0x8b
      warn_alloc+0xfe/0x160
      __alloc_pages_slowpath+0xd3e/0xd80
      __alloc_pages_nodemask+0x2f0/0x340
      kmalloc_order+0x18/0x70
      kmalloc_order_trace+0x1d/0xb0
      ipmi_create_user+0x55/0x2c0 [ipmi_msghandler]
      ipmi_open+0x72/0x110 [ipmi_devintf]
      chrdev_open+0xcb/0x1e0
      do_dentry_open+0x1ce/0x380
      path_openat+0x305/0x14f0
      do_filp_open+0x9b/0x110
      do_sys_open+0x1bd/0x250
      do_syscall_64+0x5b/0x1f0
      entry_SYSCALL_64_after_hwframe+0x44/0xa9

Using vzalloc/vfree for creating ipmi_user heals the
problem

Thanks to Stephen Rothwell for finding the vmalloc.h
inclusion issue.

Signed-off-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index c48d8f086382e602716d221a0c08bbf97bc28c5d..9afd220cd824e9d76adf19772f1b2cc6960f4668 100644 (file)
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -33,6 +33,7 @@
 #include <linux/workqueue.h>
 #include <linux/uuid.h>
 #include <linux/nospec.h>
+#include <linux/vmalloc.h>
 
 #define IPMI_DRIVER_VERSION "39.2"
 
@@ -1153,7 +1154,7 @@ static void free_user_work(struct work_struct *work)
                                              remove_work);
 
        cleanup_srcu_struct(&user->release_barrier);
-       kfree(user);
+       vfree(user);
 }
 
 int ipmi_create_user(unsigned int          if_num,
@@ -1185,7 +1186,7 @@ int ipmi_create_user(unsigned int          if_num,
        if (rv)
                return rv;
 
-       new_user = kmalloc(sizeof(*new_user), GFP_KERNEL);
+       new_user = vzalloc(sizeof(*new_user));
        if (!new_user)
                return -ENOMEM;
 
@@ -1232,7 +1233,7 @@ int ipmi_create_user(unsigned int          if_num,
 
 out_kfree:
        srcu_read_unlock(&ipmi_interfaces_srcu, index);
-       kfree(new_user);
+       vfree(new_user);
        return rv;
 }
 EXPORT_SYMBOL(ipmi_create_user);