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| author |   Stefan Richter <stefanr@s5r6.in-berlin.de> | 2009-10-15 21:16:53 +0200 |
|---|---|---|
| committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2009-10-31 11:40:52 +0100 |
| commit | b2c0a2ac3e59f4764c59c23bd90b571e44256030 (patch) | |
| tree | b42fc9ccf784a8948161350b01354d0ce3f7b6e8 /drivers/firewire | |
| parent | firewire: ohci: 0 may be a valid DMA address (diff) | |
| download | linux-dev-b2c0a2ac3e59f4764c59c23bd90b571e44256030.tar.xz linux-dev-b2c0a2ac3e59f4764c59c23bd90b571e44256030.zip | |
firewire: cdev: reduce stack usage by ioctl_dispatch
Replace a hardcoded buffer size by a sizeof union {}. This shrinks the
stack-allocated ioctl argument buffer from 256 to 40 bytes. (This is
not much, but subsequent stack usage particularly by the queue_iso ioctl
handler adds up.)
The new form is also easier to keep up to date than a hardcoded size if
more ioctls are added.
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Diffstat (limited to 'drivers/firewire')
| -rw-r--r-- | drivers/firewire/core-cdev.c | 18 |
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/firewire/core-cdev.c b/drivers/firewire/core-cdev.c index 1accfaf96c6f..e7290928a900 100644 --- a/drivers/firewire/core-cdev.c +++ b/drivers/firewire/core-cdev.c @@ -1299,7 +1299,23 @@ static int (* const ioctl_handlers[])(struct client *client, void *buffer) = { static int dispatch_ioctl(struct client *client, unsigned int cmd, void __user *arg) { - char buffer[256]; + char buffer[sizeof(union { + struct fw_cdev_get_info _00; + struct fw_cdev_send_request _01; + struct fw_cdev_allocate _02; + struct fw_cdev_deallocate _03; + struct fw_cdev_send_response _04; + struct fw_cdev_initiate_bus_reset _05; + struct fw_cdev_add_descriptor _06; + struct fw_cdev_remove_descriptor _07; + struct fw_cdev_create_iso_context _08; + struct fw_cdev_queue_iso _09; + struct fw_cdev_start_iso _0a; + struct fw_cdev_stop_iso _0b; + struct fw_cdev_get_cycle_timer _0c; + struct fw_cdev_allocate_iso_resource _0d; + struct fw_cdev_send_stream_packet _13; + })]; int ret; if (_IOC_TYPE(cmd) != '#' || |