ALSA: compress_offload: avoid 64-bit get_user()

On some architectures, get_user() cannot read a 64-bit user variable:

arm-linux-gnueabi-ld: sound/core/compress_offload.o: in function `snd_compr_ioctl':
compress_offload.c:(.text.snd_compr_ioctl+0x538): undefined reference to `__get_user_bad'

Use an equivalent copy_from_user() instead.

Fixes: 0417715 ("ALSA: compress_offload: introduce accel operation mode")
Signed-off-by: Arnd Bergmann <[email protected]>
Acked-by: Shengjiu Wang <[email protected]>
Acked-by: Vinod Koul <[email protected]>
Signed-off-by: Takashi Iwai <[email protected]>
Link: https://patch.msgid.link/[email protected]

Author: arndb

sound/core/compress_offload.c

@@ -1180,9 +1180,9 @@ static int snd_compr_task_seq(struct snd_compr_stream *stream, unsigned long arg
 
 	if (stream->runtime->state != SNDRV_PCM_STATE_SETUP)
 		return -EPERM;
-	retval = get_user(seqno, (__u64 __user *)arg);
-	if (retval < 0)
-		return retval;
+	retval = copy_from_user(&seqno, (__u64 __user *)arg, sizeof(seqno));
+	if (retval)
+		return -EFAULT;
 	retval = 0;
 	if (seqno == 0) {
 		list_for_each_entry_reverse(task, &stream->runtime->tasks, list)