ALSA: hda: Fix driver index handling at re-binding

HD-audio driver handles the multiple instances and keeps the static
index that is incremented at each probe.  This becomes a problem when
user tries to re-bind the device via sysfs multiple times; as the
device index isn't cleared unlike rmmod case, it points to the next
element at re-binding, and eventually later you can't probe any more
when it reaches to SNDRV_CARDS_MAX (usually 32).

This patch is an attempt to improve the handling at rebinding.
Instead of a static device index, now we keep a bitmap and assigns to
the first zero bit position.  At the driver remove, in return, the
bitmap slot is cleared again, so that it'll be available for the next
probe.

Reported-by: Alexander Sergeyev <sergeev917@gmail.com>
Link: https://lore.kernel.org/r/20220209081912.20687-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 4b0338c4c54377faad7fc9ef429176fa08459c3a..a2922233e85faaee54c6d2fa3f8cd071d43b4177 100644 (file)
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2064,14 +2064,16 @@ static const struct hda_controller_ops pci_hda_ops = {
        .position_check = azx_position_check,
 };
 
+static DECLARE_BITMAP(probed_devs, SNDRV_CARDS);
+
 static int azx_probe(struct pci_dev *pci,
                     const struct pci_device_id *pci_id)
 {
-       static int dev;
        struct snd_card *card;
        struct hda_intel *hda;
        struct azx *chip;
        bool schedule_probe;
+       int dev;
        int err;
 
        if (pci_match_id(driver_denylist, pci)) {
@@ -2079,10 +2081,11 @@ static int azx_probe(struct pci_dev *pci,
                return -ENODEV;
        }
 
+       dev = find_first_zero_bit(probed_devs, SNDRV_CARDS);
        if (dev >= SNDRV_CARDS)
                return -ENODEV;
        if (!enable[dev]) {
-               dev++;
+               set_bit(dev, probed_devs);
                return -ENOENT;
        }
 
@@ -2149,7 +2152,7 @@ static int azx_probe(struct pci_dev *pci,
        if (schedule_probe)
                schedule_delayed_work(&hda->probe_work, 0);
 
-       dev++;
+       set_bit(dev, probed_devs);
        if (chip->disabled)
                complete_all(&hda->probe_wait);
        return 0;
@@ -2372,6 +2375,7 @@ static void azx_remove(struct pci_dev *pci)
                cancel_delayed_work_sync(&hda->probe_work);
                device_lock(&pci->dev);
 
+               clear_bit(chip->dev_index, probed_devs);
                pci_set_drvdata(pci, NULL);
                snd_card_free(card);
        }