Skip to content

L
linux
Commit 10cd2597 authored by Dominik Brodowski's avatar Dominik Brodowski Committed by Linus Torvalds
Browse files
Options

[PATCH] pcmcia: reduce stack usage in ds_ioctl (Randy Dunlap) 

Reduce stack usage from 696 (0x2b8) to 24 (0x18) (on x86-32).
Signed-off-by: default avatarRandy Dunlap <rddunlap@osdl.org>
Signed-off-by: default avatarDominik Brodowski <linux@broro.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 9eb9ea0e
Show whitespace changes
Inline Side-by-side
Showing with 54 additions and 38 deletions
drivers/pcmcia/ds.c
View file @ 10cd2597
......@@ -1102,7 +1102,7 @@ static int ds_ioctl(struct inode * inode, struct file * file,
void __user *uarg = (char __user *)arg;
u_int size;
int ret, err;
ds_ioctl_arg_t buf;
ds_ioctl_arg_t *buf;
user_info_t *user;
ds_dbg(2, "ds_ioctl(socket %d, %#x, %#lx)\n", iminor(inode), cmd, arg);
......@@ -1136,54 +1136,58 @@ static int ds_ioctl(struct inode * inode, struct file * file,
return err;
}
}
buf = kmalloc(sizeof(ds_ioctl_arg_t), GFP_KERNEL);
if (!buf)
return -ENOMEM;
err = ret = 0;
if (cmd & IOC_IN) __copy_from_user((char *)&buf, uarg, size);
if (cmd & IOC_IN) __copy_from_user((char *)buf, uarg, size);
switch (cmd) {
case DS_ADJUST_RESOURCE_INFO:
ret = pcmcia_adjust_resource_info(&buf.adjust);
ret = pcmcia_adjust_resource_info(&buf->adjust);
break;
case DS_GET_CARD_SERVICES_INFO:
ret = pcmcia_get_card_services_info(&buf.servinfo);
ret = pcmcia_get_card_services_info(&buf->servinfo);
break;
case DS_GET_CONFIGURATION_INFO:
if (buf.config.Function &&
(buf.config.Function >= s->parent->functions))
if (buf->config.Function &&
(buf->config.Function >= s->parent->functions))
ret = CS_BAD_ARGS;
else
ret = pccard_get_configuration_info(s->parent, buf.config.Function, &buf.config);
ret = pccard_get_configuration_info(s->parent,
buf->config.Function, &buf->config);
break;
case DS_GET_FIRST_TUPLE:
pcmcia_validate_mem(s->parent);
ret = pccard_get_first_tuple(s->parent, BIND_FN_ALL, &buf.tuple);
ret = pccard_get_first_tuple(s->parent, BIND_FN_ALL, &buf->tuple);
break;
case DS_GET_NEXT_TUPLE:
ret = pccard_get_next_tuple(s->parent, BIND_FN_ALL, &buf.tuple);
ret = pccard_get_next_tuple(s->parent, BIND_FN_ALL, &buf->tuple);
break;
case DS_GET_TUPLE_DATA:
buf.tuple.TupleData = buf.tuple_parse.data;
buf.tuple.TupleDataMax = sizeof(buf.tuple_parse.data);
ret = pccard_get_tuple_data(s->parent, &buf.tuple);
buf->tuple.TupleData = buf->tuple_parse.data;
buf->tuple.TupleDataMax = sizeof(buf->tuple_parse.data);
ret = pccard_get_tuple_data(s->parent, &buf->tuple);
break;
case DS_PARSE_TUPLE:
buf.tuple.TupleData = buf.tuple_parse.data;
ret = pccard_parse_tuple(&buf.tuple, &buf.tuple_parse.parse);
buf->tuple.TupleData = buf->tuple_parse.data;
ret = pccard_parse_tuple(&buf->tuple, &buf->tuple_parse.parse);
break;
case DS_RESET_CARD:
ret = pccard_reset_card(s->parent);
break;
case DS_GET_STATUS:
if (buf.status.Function &&
(buf.status.Function >= s->parent->functions))
if (buf->status.Function &&
(buf->status.Function >= s->parent->functions))
ret = CS_BAD_ARGS;
else
ret = pccard_get_status(s->parent, buf.status.Function, &buf.status);
ret = pccard_get_status(s->parent, buf->status.Function, &buf->status);
break;
case DS_VALIDATE_CIS:
pcmcia_validate_mem(s->parent);
ret = pccard_validate_cis(s->parent, BIND_FN_ALL, &buf.cisinfo);
ret = pccard_validate_cis(s->parent, BIND_FN_ALL, &buf->cisinfo);
break;
case DS_SUSPEND_CARD:
ret = pcmcia_suspend_card(s->parent);
......@@ -1198,49 +1202,60 @@ static int ds_ioctl(struct inode * inode, struct file * file,
err = pcmcia_insert_card(s->parent);
break;
case DS_ACCESS_CONFIGURATION_REGISTER:
if ((buf.conf_reg.Action == CS_WRITE) && !capable(CAP_SYS_ADMIN))
return -EPERM;
if (buf.conf_reg.Function &&
(buf.conf_reg.Function >= s->parent->functions))
if ((buf->conf_reg.Action == CS_WRITE) && !capable(CAP_SYS_ADMIN)) {
err = -EPERM;
goto free_out;
}
if (buf->conf_reg.Function &&
(buf->conf_reg.Function >= s->parent->functions))
ret = CS_BAD_ARGS;
else
ret = pccard_access_configuration_register(s->parent, buf.conf_reg.Function, &buf.conf_reg);
ret = pccard_access_configuration_register(s->parent,
buf->conf_reg.Function, &buf->conf_reg);
break;
case DS_GET_FIRST_REGION:
ret = pccard_get_first_region(s->parent, &buf.region);
ret = pccard_get_first_region(s->parent, &buf->region);
break;
case DS_GET_NEXT_REGION:
ret = pccard_get_next_region(s->parent, &buf.region);
ret = pccard_get_next_region(s->parent, &buf->region);
break;
case DS_GET_FIRST_WINDOW:
ret = pcmcia_get_window(s->parent, &buf.win_info.handle, 0, &buf.win_info.window);
ret = pcmcia_get_window(s->parent, &buf->win_info.handle, 0,
&buf->win_info.window);
break;
case DS_GET_NEXT_WINDOW:
ret = pcmcia_get_window(s->parent, &buf.win_info.handle, buf.win_info.handle->index + 1, &buf.win_info.window);
ret = pcmcia_get_window(s->parent, &buf->win_info.handle,
buf->win_info.handle->index + 1, &buf->win_info.window);
break;
case DS_GET_MEM_PAGE:
ret = pcmcia_get_mem_page(buf.win_info.handle,
&buf.win_info.map);
ret = pcmcia_get_mem_page(buf->win_info.handle,
&buf->win_info.map);
break;
case DS_REPLACE_CIS:
ret = pcmcia_replace_cis(s->parent, &buf.cisdump);
ret = pcmcia_replace_cis(s->parent, &buf->cisdump);
break;
case DS_BIND_REQUEST:
if (!capable(CAP_SYS_ADMIN)) return -EPERM;
err = bind_request(s, &buf.bind_info);
if (!capable(CAP_SYS_ADMIN)) {
err = -EPERM;
goto free_out;
}
err = bind_request(s, &buf->bind_info);
break;
case DS_GET_DEVICE_INFO:
err = get_device_info(s, &buf.bind_info, 1);
err = get_device_info(s, &buf->bind_info, 1);
break;
case DS_GET_NEXT_DEVICE:
err = get_device_info(s, &buf.bind_info, 0);
err = get_device_info(s, &buf->bind_info, 0);
break;
case DS_UNBIND_REQUEST:
err = 0;
break;
case DS_BIND_MTD:
if (!capable(CAP_SYS_ADMIN)) return -EPERM;
err = bind_mtd(s, &buf.mtd_info);
if (!capable(CAP_SYS_ADMIN)) {
err = -EPERM;
goto free_out;
}
err = bind_mtd(s, &buf->mtd_info);
break;
default:
err = -EINVAL;
......@@ -1268,11 +1283,12 @@ static int ds_ioctl(struct inode * inode, struct file * file,
}
if (cmd & IOC_OUT) {
if (__copy_to_user(uarg, (char *)&buf, size))
if (__copy_to_user(uarg, (char *)buf, size))
err = -EFAULT;
}
free_out:
kfree(buf);
return err;
} /* ds_ioctl */
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment
GitLab Nexedi Edition | About GitLab | About Nexedi | 沪ICP备2021021310号-2 | 沪ICP备2021021310号-7