From: Jorn Engel Reduce stack usage in the cpqarray ioctl byt several hundred bytes. drivers/block/cpqarray.c | 26 +++++++++++++++++++------- 1 files changed, 19 insertions(+), 7 deletions(-) diff -puN drivers/block/cpqarray.c~cpqarray-stack-reduction drivers/block/cpqarray.c --- 25/drivers/block/cpqarray.c~cpqarray-stack-reduction 2003-06-10 23:33:24.000000000 -0700 +++ 25-akpm/drivers/block/cpqarray.c 2003-06-10 23:33:24.000000000 -0700 @@ -1028,7 +1028,7 @@ static int ida_ioctl(struct inode *inode int diskinfo[4]; struct hd_geometry *geo = (struct hd_geometry *)arg; ida_ioctl_t *io = (ida_ioctl_t*)arg; - ida_ioctl_t my_io; + ida_ioctl_t *my_io; switch(cmd) { case HDIO_GETGEO: @@ -1051,12 +1051,24 @@ static int ida_ioctl(struct inode *inode return -EFAULT; return 0; case IDAPASSTHRU: - if (!capable(CAP_SYS_RAWIO)) return -EPERM; - if (copy_from_user(&my_io, io, sizeof(my_io))) - return -EFAULT; - error = ida_ctlr_ioctl(host, drv - host->drv, &my_io); - if (error) return error; - return copy_to_user(io, &my_io, sizeof(my_io)) ? -EFAULT : 0; + if (!capable(CAP_SYS_RAWIO)) + return -EPERM; + my_io = kmalloc(sizeof(ida_ioctl_t), GFP_KERNEL); + if (!my_io) + return -ENOMEM; + error = -EFAULT; + if (copy_from_user(my_io, io, sizeof(*my_io))) + goto out_passthru; + error = ida_ctlr_ioctl(host, drv - host->drv, my_io); + if (error) + goto out_passthru; + error = -EFAULT; + if (copy_to_user(io, &my_io, sizeof(*my_io))) + goto out_passthru; + error = 0; +out_passthru: + kfree(my_io); + return error; case IDAGETCTLRSIG: if (!arg) return -EINVAL; put_user(host->ctlr_sig, (int*)arg); _