ALSA: usb - Remove trailing spaces from USB card name strings
Some USB devices give trailing spaces in strings returned from
usb_string(). This confuses the automatic card-id creation, resulting
always in "default".
This patch fixes the behavior by removing trailing spaces.
Signed-off-by: Takashi Iwai <tiwai@suse.de>
diff --git a/sound/usb/card.c b/sound/usb/card.c
index 40722f8..a90662a 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -41,6 +41,7 @@
#include <linux/list.h>
#include <linux/slab.h>
#include <linux/string.h>
+#include <linux/ctype.h>
#include <linux/usb.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
@@ -283,6 +284,15 @@
return snd_usb_audio_free(chip);
}
+static void remove_trailing_spaces(char *str)
+{
+ char *p;
+
+ if (!*str)
+ return;
+ for (p = str + strlen(str) - 1; p >= str && isspace(*p); p--)
+ *p = 0;
+}
/*
* create a chip instance and set its names.
@@ -351,7 +361,7 @@
snd_component_add(card, component);
/* retrieve the device string as shortname */
- if (quirk && quirk->product_name) {
+ if (quirk && quirk->product_name && *quirk->product_name) {
strlcpy(card->shortname, quirk->product_name, sizeof(card->shortname));
} else {
if (!dev->descriptor.iProduct ||
@@ -363,9 +373,10 @@
USB_ID_PRODUCT(chip->usb_id));
}
}
+ remove_trailing_spaces(card->shortname);
/* retrieve the vendor and device strings as longname */
- if (quirk && quirk->vendor_name) {
+ if (quirk && quirk->vendor_name && *quirk->vendor_name) {
len = strlcpy(card->longname, quirk->vendor_name, sizeof(card->longname));
} else {
if (dev->descriptor.iManufacturer)
@@ -375,8 +386,11 @@
len = 0;
/* we don't really care if there isn't any vendor string */
}
- if (len > 0)
- strlcat(card->longname, " ", sizeof(card->longname));
+ if (len > 0) {
+ remove_trailing_spaces(card->longname);
+ if (*card->longname)
+ strlcat(card->longname, " ", sizeof(card->longname));
+ }
strlcat(card->longname, card->shortname, sizeof(card->longname));