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authorSudip Mukherjee <sudipm.mukherjee@gmail.com>2019-10-18 17:17:12 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-11-04 17:42:28 +0100
commit4d2c82b192e4b2037590343620329f2d88cc1135 (patch)
treed5ad86655936048e039b39771a5b15786aa545b4 /drivers/tty
parent5bfb26303663b022a7750fd9d80dc8bb8dc8b604 (diff)
downloadlinux-4d2c82b192e4b2037590343620329f2d88cc1135.tar.bz2
tty: rocket: reduce stack usage
The build of xtensa allmodconfig gives warning of: In function 'get_ports.isra.0': warning: the frame size of 1040 bytes is larger than 1024 bytes Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com> Acked-by: Jiri Slaby <jslaby@suse.cz> Link: https://lore.kernel.org/r/20191018161712.27807-1-sudipm.mukherjee@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
-rw-r--r--drivers/tty/rocket.c32
1 files changed, 19 insertions, 13 deletions
diff --git a/drivers/tty/rocket.c b/drivers/tty/rocket.c
index 5ba6816ebf81..fbaa4ec85560 100644
--- a/drivers/tty/rocket.c
+++ b/drivers/tty/rocket.c
@@ -1222,22 +1222,28 @@ static int set_config(struct tty_struct *tty, struct r_port *info,
*/
static int get_ports(struct r_port *info, struct rocket_ports __user *retports)
{
- struct rocket_ports tmp;
- int board;
+ struct rocket_ports *tmp;
+ int board, ret = 0;
- memset(&tmp, 0, sizeof (tmp));
- tmp.tty_major = rocket_driver->major;
+ tmp = kzalloc(sizeof(*tmp), GFP_KERNEL);
+ if (!tmp)
+ return -ENOMEM;
+
+ tmp->tty_major = rocket_driver->major;
for (board = 0; board < 4; board++) {
- tmp.rocketModel[board].model = rocketModel[board].model;
- strcpy(tmp.rocketModel[board].modelString, rocketModel[board].modelString);
- tmp.rocketModel[board].numPorts = rocketModel[board].numPorts;
- tmp.rocketModel[board].loadrm2 = rocketModel[board].loadrm2;
- tmp.rocketModel[board].startingPortNumber = rocketModel[board].startingPortNumber;
- }
- if (copy_to_user(retports, &tmp, sizeof (*retports)))
- return -EFAULT;
- return 0;
+ tmp->rocketModel[board].model = rocketModel[board].model;
+ strcpy(tmp->rocketModel[board].modelString,
+ rocketModel[board].modelString);
+ tmp->rocketModel[board].numPorts = rocketModel[board].numPorts;
+ tmp->rocketModel[board].loadrm2 = rocketModel[board].loadrm2;
+ tmp->rocketModel[board].startingPortNumber =
+ rocketModel[board].startingPortNumber;
+ }
+ if (copy_to_user(retports, tmp, sizeof(*retports)))
+ ret = -EFAULT;
+ kfree(tmp);
+ return ret;
}
static int reset_rm2(struct r_port *info, void __user *arg)