V4L/DVB (7302): pvrusb2: Improve control validation for enumerations

When an enumeration control is changed, the pvrusb2 driver assumed
that the enumeration values were continuous.  That is no longer true;
this change allows for properly input validation even when not all
enumeration values are legal (which can happen with input selection
based on what the hardware supports).

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

diff --git a/drivers/media/video/pvrusb2/pvrusb2-ctrl.c b/drivers/media/video/pvrusb2/pvrusb2-ctrl.c
index 5a3e8d2..91a42f2 100644 (file)
--- a/drivers/media/video/pvrusb2/pvrusb2-ctrl.c
+++ b/drivers/media/video/pvrusb2/pvrusb2-ctrl.c
@@ -30,6 +30,9 @@ static int pvr2_ctrl_range_check(struct pvr2_ctrl *cptr,int val)
 {
        if (cptr->info->check_value) {
                if (!cptr->info->check_value(cptr,val)) return -ERANGE;
+       } else if (cptr->info->type == pvr2_ctl_enum) {
+               if (val < 0) return -ERANGE;
+               if (val >= cptr->info->def.type_enum.count) return -ERANGE;
        } else {
                int lim;
                lim = cptr->info->def.type_int.min_value;
@@ -63,13 +66,10 @@ int pvr2_ctrl_set_mask_value(struct pvr2_ctrl *cptr,int mask,int val)
                if (cptr->info->set_value) {
                        if (cptr->info->type == pvr2_ctl_bitmask) {
                                mask &= cptr->info->def.type_bitmask.valid_bits;
-                       } else if (cptr->info->type == pvr2_ctl_int) {
+                       } else if ((cptr->info->type == pvr2_ctl_int)||
+                                  (cptr->info->type == pvr2_ctl_enum)) {
                                ret = pvr2_ctrl_range_check(cptr,val);
                                if (ret < 0) break;
-                       } else if (cptr->info->type == pvr2_ctl_enum) {
-                               if (val >= cptr->info->def.type_enum.count) {
-                                       break;
-                               }
                        } else if (cptr->info->type != pvr2_ctl_bool) {
                                break;
                        }
@@ -204,8 +204,7 @@ int pvr2_ctrl_get_valname(struct pvr2_ctrl *cptr,int val,
                if (cptr->info->type == pvr2_ctl_enum) {
                        const char **names;
                        names = cptr->info->def.type_enum.value_names;
-                       if ((val >= 0) &&
-                           (val < cptr->info->def.type_enum.count)) {
+                       if (pvr2_ctrl_range_check(cptr,val) == 0) {
                                if (names[val]) {
                                        *blen = scnprintf(
                                                bptr,bmax,"%s",
@@ -528,10 +527,8 @@ int pvr2_ctrl_sym_to_value(struct pvr2_ctrl *cptr,
                                ptr,len,valptr,
                                cptr->info->def.type_enum.value_names,
                                cptr->info->def.type_enum.count);
-                       if ((ret >= 0) &&
-                           ((*valptr < 0) ||
-                            (*valptr >= cptr->info->def.type_enum.count))) {
-                               ret = -ERANGE;
+                       if (ret >= 0) {
+                               ret = pvr2_ctrl_range_check(cptr,*valptr);
                        }
                        if (maskptr) *maskptr = ~0;
                } else if (cptr->info->type == pvr2_ctl_bitmask) {