Em 26-10-2011 12:19, Laurent Defert :
> Hello,
>
> You'll find below a patch that implements the FE_SET_PROPERTY ioctl compat code. This code is reached when a 32 bit application does the ioctl on a 64 bit kernel.
> There are other dvb ioctl that are missing from the compat layer (FE_GET_PROPERTY and FE_SET_FRONTEND_TUNE_MODE), if this patch is ok, i'm going to write them as well.
If are there many things, then maybe the better would be to do what we've done with V4L: put the compat stuff
into a separate file (see drivers/media/video/v4l2-compat-ioctl32.c). The glue is done by adding,
at drivers/media/video/v4l2-dev.c:
.compat_ioctl = v4l2_compat_ioctl32
at struct file_operations.
>
> Laurent
>
> commit 6647fda45d70d1947f2dff06c485aa64d78357d7
> Author: Laurent Defert <laurent.defert@xxxxxxxxxxxx>
> Date: Wed Oct 26 14:32:29 2011 +0200
>
> [media] compat_ioctl: add compat handler for FE_SET_PROPERTY
>
> fixes following error seen on x86_64 kernel:
> ioctl32(dvblast:6973): Unknown cmd fd(3) cmd(40086f52){t:'o';sz:8} arg(0805a318) on /dev/dvb/adapter0/frontend0
>
> The argument (struct dtv_properties) contains a pointer to an array of struct dtv_property.
> Both struct are converted to have proper pointer size.
>
> Signed-off-by: Laurent Defert <laurent.defert@xxxxxxxxxxxx>
>
> diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
> index 51352de..6b89ff0 100644
> --- a/fs/compat_ioctl.c
> +++ b/fs/compat_ioctl.c
> @@ -222,6 +222,84 @@ static int do_video_set_spu_palette(unsigned int fd, unsigned int cmd,
> return err;
> }
>
> +struct compat_dtv_property {
> + __u32 cmd;
> + __u32 reserved[3];
> + union {
> + __u32 data;
> + struct {
> + __u8 data[32];
> + __u32 len;
> + __u32 reserved1[3];
> + compat_uptr_t reserved2;
> + } buffer;
> + } u;
> + int result;
Hmm... maybe it would be better to change from "int" to "s32".
> +};
> +
> +struct compat_dtv_properties {
> + __u32 num;
> + compat_uptr_t props;
> +};
> +
> +#define FE_SET_PROPERTY32 _IOW('o', 82, struct compat_dtv_properties)
> +
> +static int do_fe_set_property(unsigned int fd, unsigned int cmd,
> + struct compat_dtv_properties __user *dtv32)
> +{
> + struct dtv_properties __user *dtv;
> + struct dtv_property __user *properties;
> + struct compat_dtv_property __user *properties32;
> + compat_uptr_t data;
> +
> + int err;
> + int i;
> + __u32 num;
> +
> + err = get_user(num, &dtv32->num);
> + err |= get_user(data, &dtv32->props);
> +
> + if(err)
> + return -EFAULT;
> +
> + dtv = compat_alloc_user_space(sizeof(struct dtv_properties) +
> + sizeof(struct dtv_property) * num);
> + properties = (struct dtv_property*)((char*)dtv +
> + sizeof(struct dtv_properties));
> +
> + err = put_user(properties, &dtv->props);
> + err |= put_user(num, &dtv->num);
> +
> + properties32 = compat_ptr(data);
> +
> + if(err)
> + return -EFAULT;
Please check it with checkpatch.pl. Coding style is wrong here and on a few other places.
> +
> + for(i = 0; i < num; i++) {
> + compat_uptr_t reserved2;
> +
> + err |= copy_in_user(&properties[i], &properties32[i],
> + (8 * sizeof(__u32)) + (32 * sizeof(__u8)));
> + err |= get_user(reserved2, &properties32[i].u.buffer.reserved2);
> + err |= put_user(compat_ptr(reserved2),
> + &properties[i].u.buffer.reserved2);
> + }
> +
> + if(err)
> + return -EFAULT;
> +
> + err = sys_ioctl(fd, FE_SET_PROPERTY, (unsigned long) dtv);
> +
> + for(i = 0; i < num; i++) {
> + if(copy_in_user(&properties[i].result, &properties32[i].result,
> + sizeof(int)))
> + return -EFAULT;
> + }
> +
> + return err;
> +}
> +
> +
> #ifdef CONFIG_BLOCK
> typedef struct sg_io_hdr32 {
> compat_int_t interface_id; /* [i] 'S' for SCSI generic (required) */
> @@ -1470,6 +1548,8 @@ static long do_ioctl_trans(int fd, unsigned int cmd,
> return do_video_stillpicture(fd, cmd, argp);
> case VIDEO_SET_SPU_PALETTE:
> return do_video_set_spu_palette(fd, cmd, argp);
> + case FE_SET_PROPERTY32:
> + return do_fe_set_property(fd, cmd, argp);
> }
>
> /*
>
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