ALSA: echoaudio: Fix potential Oops in snd_echo_resume()

Freeing chip on error may lead to an Oops at the next time
the system goes to resume. Fix this by removing all
snd_echo_free() calls on error.

Fixes: 47b5d028fdce8 ("ALSA: Echoaudio - Add suspend support #2")
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Link: https://lore.kernel.org/r/20200813074632.17022-1-dinghao.liu@zju.edu.cn
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/echoaudio/echoaudio.c b/sound/pci/echoaudio/echoaudio.c
index 1b7a67c..a20b2bb 100644 (file)
--- a/sound/pci/echoaudio/echoaudio.c
+++ b/sound/pci/echoaudio/echoaudio.c
@@ -2212,7 +2212,6 @@ static int snd_echo_resume(struct device *dev)
        if (err < 0) {
                kfree(commpage_bak);
                dev_err(dev, "resume init_hw err=%d\n", err);
-               snd_echo_free(chip);
                return err;
        }
 
@@ -2239,7 +2238,6 @@ static int snd_echo_resume(struct device *dev)
        if (request_irq(pci->irq, snd_echo_interrupt, IRQF_SHARED,
                        KBUILD_MODNAME, chip)) {
                dev_err(chip->card->dev, "cannot grab irq\n");
-               snd_echo_free(chip);
                return -EBUSY;
        }
        chip->irq = pci->irq;