scsi: sd: Revert "Rely on the driver core for asynchronous probing"

Hibernation hangs as follows due to commit 21e6ba3f0e02 when using SATA:

Call Trace:
 __schedule+0x464/0xe70
 schedule+0x4e/0xd0
 blk_queue_enter+0x5fe/0x7e0
 generic_make_request+0x313/0x950
 submit_bio+0x9b/0x250
 submit_bio_wait+0xc9/0x110
 hib_submit_io+0x17d/0x1c0
 write_page+0x61/0xa0
 swap_write_page+0x4b/0x1f0
 swsusp_write+0x2f9/0x3d0
 hibernate.cold.10+0x108/0x231
 state_store+0xf7/0x100
 kobj_attr_store+0x37/0x50
 sysfs_kf_write+0x87/0xa0
 kernfs_fop_write+0x186/0x240
 __vfs_write+0x4d/0x90
 vfs_write+0xfa/0x260
 ksys_write+0xb9/0x1a0
 __x64_sys_write+0x43/0x50
 do_syscall_64+0x71/0x210
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Hence revert commit 21e6ba3f0e02.

Cc: Pavel Machek <pavel@ucw.cz>
Reported-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 10 insertions, 3 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index f29c0ca8a5f1..2b2bc4b49d78 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -567,7 +567,6 @@ static struct scsi_driver sd_template = {
 		.name		= "sd",
 		.owner		= THIS_MODULE,
 		.probe		= sd_probe,
-		.probe_type	= PROBE_PREFER_ASYNCHRONOUS,
 		.remove		= sd_remove,
 		.shutdown	= sd_shutdown,
 		.pm		= &sd_pm_ops,
@@ -3285,8 +3284,12 @@ static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
 	return 0;
 }
 
-static void sd_probe_part2(struct scsi_disk *sdkp)
+/*
+ * The asynchronous part of sd_probe
+ */
+static void sd_probe_async(void *data, async_cookie_t cookie)
 {
+	struct scsi_disk *sdkp = data;
 	struct scsi_device *sdp;
 	struct gendisk *gd;
 	u32 index;
@@ -3340,6 +3343,7 @@ static void sd_probe_part2(struct scsi_disk *sdkp)
 	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",
 		  sdp->removable ? "removable " : "");
 	scsi_autopm_put_device(sdp);
+	put_device(&sdkp->dev);
 }
 
 /**
@@ -3431,7 +3435,8 @@ static int sd_probe(struct device *dev)
 	get_device(dev);
 	dev_set_drvdata(dev, sdkp);
 
-	sd_probe_part2(sdkp);
+	get_device(&sdkp->dev);	/* prevent release before async_schedule */
+	async_schedule_domain(sd_probe_async, sdkp, &scsi_sd_probe_domain);
 
 	return 0;
 
@@ -3466,6 +3471,8 @@ static int sd_remove(struct device *dev)
 	devt = disk_devt(sdkp->disk);
 	scsi_autopm_get_device(sdkp->device);
 
+	async_synchronize_full_domain(&scsi_sd_pm_domain);
+	async_synchronize_full_domain(&scsi_sd_probe_domain);
 	device_del(&sdkp->dev);
 	del_gendisk(sdkp->disk);
 	sd_shutdown(dev);