amixer: fix display of unreadable control elements

When an element is marked as not readble, do not try to read it and then
complain about the error, but just ignore it.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

diff --git a/amixer/amixer.c b/amixer/amixer.c
index 962072133ccdaae8e23772ac1fcbb4d6c85a232a..7b5503560fc8efef99f9ba68081ee1757cee6bef 100644 (file)
--- a/amixer/amixer.c
+++ b/amixer/amixer.c
@@ -602,6 +602,8 @@ static int show_control(const char *space, snd_hctl_elem_t *elem,
                break;
        }
        if (level & LEVEL_BASIC) {
+               if (!snd_ctl_elem_info_is_readable(info))
+                       goto __skip_read;
                if ((err = snd_hctl_elem_read(elem, control)) < 0) {
                        error("Control %s element read error: %s\n", card, snd_strerror(err));
                        return err;
@@ -638,6 +640,7 @@ static int show_control(const char *space, snd_hctl_elem_t *elem,
                        }
                }
                printf("\n");
+             __skip_read:
                if (!snd_ctl_elem_info_is_tlv_readable(info))
                        goto __skip_tlv;
                tlv = malloc(4096);