leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tty: ipwireless: Replace GFP_ATOMIC with GFP_KERNEL in ipwireless_network_create

Browse Source 
ipwireless_network_create() is never called in atomic context.

The call chain ending up at ipwireless_network_create() is:
[1] ipwireless_network_create() <- config_ipwireless() <-
	ipwireless_attach()
ipwireless_attach() is only set as ".probe" in struct pcmcia_driver.

Despite never getting called from atomic context,
ipwireless_network_create() calls kzalloc() with GFP_ATOMIC,
which does not sleep for allocation.
GFP_ATOMIC is not necessary and can be replaced with GFP_KERNEL,
which can sleep and improve the possibility of sucessful allocation.

This is found by a static analysis tool named DCNS written by myself.
And I also manually check it.

Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jia-Ju Bai 2018-04-10 16:31:46 +08:00 committed by Greg Kroah-Hartman
parent 5909c0bf9c
commit 13eac05b05
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/tty/ipwireless/network.c
View File

@ -416,7 +416,7 @@ void ipwireless_network_packet_received(struct ipw_network *network,
struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw) struct ipw_network *ipwireless_network_create(struct ipw_hardware *hw)
{ {
struct ipw_network *network = struct ipw_network *network =
kzalloc(sizeof(struct ipw_network), GFP_ATOMIC); kzalloc(sizeof(struct ipw_network), GFP_KERNEL);
if (!network) if (!network)
return NULL; return NULL;