Messages in this thread Patch in this message |  | | Date | Tue, 12 Oct 2004 22:47:02 -0700 | From | "Randy.Dunlap" <> | Subject | [PATCH] ds: reduce stack usage in ds_ioctl |
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Hi Russell, Please consider for after 2.6.9.
-- ~Randy
Reduce stack usage from 696 (0x2b8) to 24 (0x18) (on x86-32).
Signed-off-by: Randy Dunlap <rddunlap@osdl.org>
diffstat:= drivers/pcmcia/ds.c | 79 ++++++++++++++++++++++++++++++---------------------- 1 files changed, 46 insertions(+), 33 deletions(-)
diff -Naurp ./drivers/pcmcia/ds.c~ds_ioctl ./drivers/pcmcia/ds.c --- ./drivers/pcmcia/ds.c~ds_ioctl 2004-10-11 21:10:02.000000000 -0700 +++ ./drivers/pcmcia/ds.c 2004-10-12 22:37:17.176866912 -0700 @@ -892,7 +892,7 @@ static int ds_ioctl(struct inode * inode 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); @@ -926,46 +926,49 @@ static int ds_ioctl(struct inode * inode 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(s->handle, &buf.adjust); + ret = pcmcia_adjust_resource_info(s->handle, &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: - ret = pcmcia_get_configuration_info(s->handle, &buf.config); + ret = pcmcia_get_configuration_info(s->handle, &buf->config); break; case DS_GET_FIRST_TUPLE: pcmcia_validate_mem(s->parent); - ret = pcmcia_get_first_tuple(s->handle, &buf.tuple); + ret = pcmcia_get_first_tuple(s->handle, &buf->tuple); break; case DS_GET_NEXT_TUPLE: - ret = pcmcia_get_next_tuple(s->handle, &buf.tuple); + ret = pcmcia_get_next_tuple(s->handle, &buf->tuple); break; case DS_GET_TUPLE_DATA: - buf.tuple.TupleData = buf.tuple_parse.data; - buf.tuple.TupleDataMax = sizeof(buf.tuple_parse.data); - ret = pcmcia_get_tuple_data(s->handle, &buf.tuple); + buf->tuple.TupleData = buf->tuple_parse.data; + buf->tuple.TupleDataMax = sizeof(buf->tuple_parse.data); + ret = pcmcia_get_tuple_data(s->handle, &buf->tuple); break; case DS_PARSE_TUPLE: - buf.tuple.TupleData = buf.tuple_parse.data; - ret = pcmcia_parse_tuple(s->handle, &buf.tuple, &buf.tuple_parse.parse); + buf->tuple.TupleData = buf->tuple_parse.data; + ret = pcmcia_parse_tuple(s->handle, &buf->tuple, &buf->tuple_parse.parse); break; case DS_RESET_CARD: ret = pcmcia_reset_card(s->handle, NULL); break; case DS_GET_STATUS: - ret = pcmcia_get_status(s->handle, &buf.status); + ret = pcmcia_get_status(s->handle, &buf->status); break; case DS_VALIDATE_CIS: pcmcia_validate_mem(s->parent); - ret = pcmcia_validate_cis(s->handle, &buf.cisinfo); + ret = pcmcia_validate_cis(s->handle, &buf->cisinfo); break; case DS_SUSPEND_CARD: ret = pcmcia_suspend_card(s->parent); @@ -980,46 +983,54 @@ static int ds_ioctl(struct inode * inode 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; - ret = pcmcia_access_configuration_register(s->handle, &buf.conf_reg); + if ((buf->conf_reg.Action == CS_WRITE) && !capable(CAP_SYS_ADMIN)) { + err = -EPERM; + goto free_out; + } + ret = pcmcia_access_configuration_register(s->handle, &buf->conf_reg); break; case DS_GET_FIRST_REGION: - ret = pcmcia_get_first_region(s->handle, &buf.region); + ret = pcmcia_get_first_region(s->handle, &buf->region); break; case DS_GET_NEXT_REGION: - ret = pcmcia_get_next_region(s->handle, &buf.region); + ret = pcmcia_get_next_region(s->handle, &buf->region); break; case DS_GET_FIRST_WINDOW: - buf.win_info.handle = (window_handle_t)s->handle; - ret = pcmcia_get_first_window(&buf.win_info.handle, &buf.win_info.window); + buf->win_info.handle = (window_handle_t)s->handle; + ret = pcmcia_get_first_window(&buf->win_info.handle, &buf->win_info.window); break; case DS_GET_NEXT_WINDOW: - ret = pcmcia_get_next_window(&buf.win_info.handle, &buf.win_info.window); + ret = pcmcia_get_next_window(&buf->win_info.handle, &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->handle, &buf.cisdump); + ret = pcmcia_replace_cis(s->handle, &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 = unbind_request(s, &buf.bind_info); + err = unbind_request(s, &buf->bind_info); 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; @@ -1046,8 +1057,10 @@ static int ds_ioctl(struct inode * inode } } - if (cmd & IOC_OUT) __copy_to_user(uarg, (char *)&buf, size); + if (cmd & IOC_OUT) __copy_to_user(uarg, (char *)buf, size); +free_out: + kfree(buf); return err; } /* ds_ioctl */
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