Re: [PATCH] HID: Use kvzalloc instead of kzalloc in hid_register_field()

[Jiri Kosina]

On Wed, 22 May 2024, hailong.liu@xxxxxxxx wrote:

> From: "Hailong.Liu" <hailong.liu@xxxxxxxx>
> 
> The function hid_register_field() might allocate more than 32k, which
> would use order-4 contiguous memory if the parameter usage exceeds
> 1024. However, after the system runs for a while, the memory can
> become heavily fragmented. This increases the likelihood of order-4 page
> allocation failure. Here’s the relevant log.
> 
> [71553.093623]kworker/1: 0: page allocation failure: order:4, mode:0x40dc0(GFP_KERNEL|__GFP_COMP|__GFP_ZERO), nodemask=(null),cpuset=/,mems_allowed=0
> [71553.093669]Workqueue: events uhid_device_add_worker
> [71553.093683]Call trace:
> [71553.093687]: dump_backtrace+0xf4/0x118
> [71553.093696]: show_stack+0x18/0x24
> [71553.093702]: dump_stack_lvl+0x60/0x7c
> [71553.093710]: dump_stack+0x18/0x3c
> [71553.093717]: warn_alloc+0xf4/0x174
> [71553.093725]: __alloc_pages_slowpath+0x1ba0/0x1cac
> [71553.093732]: __alloc_pages+0x460/0x560
> [71553.093738]: __kmalloc_large_node+0xbc/0x1f8
> [71553.093746]: __kmalloc+0x144/0x254
> [71553.093752]: hid_add_field+0x13c/0x308
> [71553.093758]: hid_parser_main+0x250/0x298
> [71553.093765]: hid_open_report+0x214/0x30c
> [71553.093771]: mt_probe+0x130/0x258
> [71553.093778]: hid_device_probe+0x11c/0x1e4
> [71553.093784]: really_probe+0xe4/0x388
> [71553.093791]: __driver_probe_device+0xa0/0x12c
> [71553.093798]: driver_probe_device+0x44/0x214
> [71553.093804]: __device_attach_driver+0xdc/0x124
> [71553.093812]: bus_for_each_drv+0x88/0xec
> [71553.093818]: __device_attach+0x84/0x170
> [71553.093824]: device_initial_probe+0x14/0x20
> [71553.093831]: bus_probe_device+0x48/0xd0
> [71553.093836]: device_add+0x248/0x928
> [71553.093844]: hid_add_device+0xf8/0x1a4
> [71553.093850]: uhid_device_add_worker+0x24/0x144
> [71553.093857]: process_one_work+0x158/0x804
> [71553.093865]: worker_thread+0x15c/0x494
> [71553.093872]: kthread+0xf4/0x1e4
> [71553.093880]: ret_from_fork+0x10/0x20
> 
> To fix the allocation failure, use kvzalloc() instead of kzalloc().
> 
> Signed-off-by: Hailong.Liu <hailong.liu@xxxxxxxx>

Applied, thanks.

-- 
Jiri Kosina
SUSE Labs