change wifi driver to cypress

hc

2024-01-05 071106ecf68c401173c58808b1cf5f68cc50d390

 kernel/drivers/scsi/ch.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
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  * SCSI Media Changer device driver for Linux 2.6
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4
  *
..
..
@@ -43,7 +44,6 @@
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44
 MODULE_ALIAS_CHARDEV_MAJOR(SCSI_CHANGER_MAJOR);
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 MODULE_ALIAS_SCSI_DEVICE(TYPE_MEDIUM_CHANGER);
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46
 
46
-static DEFINE_MUTEX(ch_mutex);
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 static int init = 1;
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 module_param(init, int, 0444);
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49
 MODULE_PARM_DESC(init, \
..
..
@@ -568,6 +568,7 @@
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568
 {
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569
 	scsi_changer *ch = container_of(ref, scsi_changer, ref);
570
570
 
571
+	ch->device = NULL;
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 	kfree(ch->dt);
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 	kfree(ch);
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 }
..
..
@@ -589,20 +590,22 @@
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 	scsi_changer *ch;
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 	int minor = iminor(inode);
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592
 
592
-	mutex_lock(&ch_mutex);
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 	spin_lock(&ch_index_lock);
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 	ch = idr_find(&ch_index_idr, minor);
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595
 
596
-	if (NULL == ch || scsi_device_get(ch->device)) {
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+	if (ch == NULL || !kref_get_unless_zero(&ch->ref)) {
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 		spin_unlock(&ch_index_lock);
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-		mutex_unlock(&ch_mutex);
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598
 		return -ENXIO;
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 	}
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-	kref_get(&ch->ref);
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 	spin_unlock(&ch_index_lock);
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-
601
+	if (scsi_device_get(ch->device)) {
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+		kref_put(&ch->ref, ch_destroy);
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+		return -ENXIO;
604
+	}
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+	/* Synchronize with ch_probe() */
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+	mutex_lock(&ch->lock);
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 	file->private_data = ch;
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-	mutex_unlock(&ch_mutex);
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+	mutex_unlock(&ch->lock);
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 	return 0;
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610
 }
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611
 
..
..
@@ -871,6 +874,10 @@
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874
 			    unsigned int cmd, unsigned long arg)
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 {
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 	scsi_changer *ch = file->private_data;
877
+	int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd,
878
+							file->f_flags & O_NDELAY);
879
+	if (retval)
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+		return retval;
874
881
 
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 	switch (cmd) {
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 	case CHIOGPARAMS:
..
..
@@ -882,7 +889,7 @@
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 	case CHIOINITELEM:
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890
 	case CHIOSVOLTAG:
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 		/* compatible */
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-		return ch_ioctl(file, cmd, arg);
892
+		return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg));
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 	case CHIOGSTATUS32:
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 	{
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895
 		struct changer_element_status32 ces32;
..
..
@@ -897,8 +904,7 @@
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 		return ch_gstatus(ch, ces32.ces_type, data);
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905
 	}
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 	default:
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-		// return scsi_ioctl_compat(ch->device, cmd, (void*)arg);
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-		return -ENOIOCTLCMD;
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+		return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg));
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908
 
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 	}
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 }
..
..
@@ -934,7 +940,16 @@
934
940
 
935
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 	ch->minor = ret;
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 	sprintf(ch->name,"ch%d",ch->minor);
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+	ret = scsi_device_get(sd);
944
+	if (ret) {
945
+		sdev_printk(KERN_WARNING, sd, "ch%d: failed to get device\n",
946
+			    ch->minor);
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+		goto remove_idr;
948
+	}
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949
 
950
+	mutex_init(&ch->lock);
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+	kref_init(&ch->ref);
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+	ch->device = sd;
938
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 	class_dev = device_create(ch_sysfs_class, dev,
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 				  MKDEV(SCSI_CHANGER_MAJOR, ch->minor), ch,
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 				  "s%s", ch->name);
..
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@@ -942,24 +957,27 @@
942
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 		sdev_printk(KERN_WARNING, sd, "ch%d: device_create failed\n",
943
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 			    ch->minor);
944
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 		ret = PTR_ERR(class_dev);
945
-		goto remove_idr;
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+		goto put_device;
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961
 	}
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962
 
948
-	mutex_init(&ch->lock);
949
-	kref_init(&ch->ref);
950
-	ch->device = sd;
963
+	mutex_lock(&ch->lock);
951
964
 	ret = ch_readconfig(ch);
952
-	if (ret)
965
+	if (ret) {
966
+		mutex_unlock(&ch->lock);
953
967
 		goto destroy_dev;
968
+	}
954
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 	if (init)
955
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 		ch_init_elem(ch);
956
971
 
972
+	mutex_unlock(&ch->lock);
957
973
 	dev_set_drvdata(dev, ch);
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974
 	sdev_printk(KERN_INFO, sd, "Attached scsi changer %s\n", ch->name);
959
975
 
960
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 	return 0;
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977
 destroy_dev:
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 	device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR, ch->minor));
979
+put_device:
980
+	scsi_device_put(sd);
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981
 remove_idr:
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 	idr_remove(&ch_index_idr, ch->minor);
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983
 free_ch:
..
..
@@ -973,9 +991,11 @@
973
991
 
974
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 	spin_lock(&ch_index_lock);
975
993
 	idr_remove(&ch_index_idr, ch->minor);
994
+	dev_set_drvdata(dev, NULL);
976
995
 	spin_unlock(&ch_index_lock);
977
996
 
978
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 	device_destroy(ch_sysfs_class, MKDEV(SCSI_CHANGER_MAJOR,ch->minor));
998
+	scsi_device_put(ch->device);
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 	kref_put(&ch->ref, ch_destroy);
980
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 	return 0;
981
1001
 }