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Commit 4ace92fc authored by Arjan van de Ven's avatar Arjan van de Ven
Browse files

fastboot: make scsi probes asynchronous 



This patch makes part of the scsi probe (which is mostly device spin up and the
partition scan) asynchronous. Only the part that runs after getting the device
number allocated is asynchronous, ensuring that device numbering remains stable.

Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
parent 22a9d645

drivers/scsi/scsi_scan.c

+3 −0
Original line number Diff line number Diff line
@@ -32,6 +32,7 @@ 
#include <linux/delay.h>

#include <linux/kthread.h>

#include <linux/spinlock.h>

#include <linux/async.h>



#include <scsi/scsi.h>

#include <scsi/scsi_cmnd.h>
@@ -179,6 +180,8 @@ int scsi_complete_async_scans(void) 
	spin_unlock(&async_scan_lock);



	kfree(data);

	/* Synchronize async operations globally */

	async_synchronize_full();

	return 0;

}

drivers/scsi/sd.c

+67 −42
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ 
#include <linux/delay.h>

#include <linux/mutex.h>

#include <linux/string_helpers.h>

#include <linux/async.h>

#include <asm/uaccess.h>



#include <scsi/scsi.h>
@@ -1802,6 +1803,71 @@ static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen) 
	return 0;

}



/*

 * 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;

	struct device *dev;



	sdp = sdkp->device;

	gd = sdkp->disk;

	index = sdkp->index;

	dev = &sdp->sdev_gendev;



	if (!sdp->request_queue->rq_timeout) {

		if (sdp->type != TYPE_MOD)

			blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);

		else

			blk_queue_rq_timeout(sdp->request_queue,

					     SD_MOD_TIMEOUT);

	}



	device_initialize(&sdkp->dev);

	sdkp->dev.parent = &sdp->sdev_gendev;

	sdkp->dev.class = &sd_disk_class;

	strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);



	if (device_add(&sdkp->dev))

		goto out_free_index;



	get_device(&sdp->sdev_gendev);



	if (index < SD_MAX_DISKS) {

		gd->major = sd_major((index & 0xf0) >> 4);

		gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);

		gd->minors = SD_MINORS;

	}

	gd->fops = &sd_fops;

	gd->private_data = &sdkp->driver;

	gd->queue = sdkp->device->request_queue;



	sd_revalidate_disk(gd);



	blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);



	gd->driverfs_dev = &sdp->sdev_gendev;

	gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;

	if (sdp->removable)

		gd->flags |= GENHD_FL_REMOVABLE;



	dev_set_drvdata(dev, sdkp);

	add_disk(gd);

	sd_dif_config_host(sdkp);



	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",

		  sdp->removable ? "removable " : "");



	return;



 out_free_index:

	ida_remove(&sd_index_ida, index);

}



/**

 *	sd_probe - called during driver initialization and whenever a

 *	new scsi device is attached to the system. It is called once
@@ -1865,48 +1931,7 @@ static int sd_probe(struct device *dev) 
	sdkp->openers = 0;

	sdkp->previous_state = 1;



	if (!sdp->request_queue->rq_timeout) {

		if (sdp->type != TYPE_MOD)

			blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);

		else

			blk_queue_rq_timeout(sdp->request_queue,

					     SD_MOD_TIMEOUT);

	}



	device_initialize(&sdkp->dev);

	sdkp->dev.parent = &sdp->sdev_gendev;

	sdkp->dev.class = &sd_disk_class;

	strncpy(sdkp->dev.bus_id, sdp->sdev_gendev.bus_id, BUS_ID_SIZE);



	if (device_add(&sdkp->dev))

		goto out_free_index;



	get_device(&sdp->sdev_gendev);



	if (index < SD_MAX_DISKS) {

		gd->major = sd_major((index & 0xf0) >> 4);

		gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);

		gd->minors = SD_MINORS;

	}

	gd->fops = &sd_fops;

	gd->private_data = &sdkp->driver;

	gd->queue = sdkp->device->request_queue;



	sd_revalidate_disk(gd);



	blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);



	gd->driverfs_dev = &sdp->sdev_gendev;

	gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;

	if (sdp->removable)

		gd->flags |= GENHD_FL_REMOVABLE;



	dev_set_drvdata(dev, sdkp);

	add_disk(gd);

	sd_dif_config_host(sdkp);



	sd_printk(KERN_NOTICE, sdkp, "Attached SCSI %sdisk\n",

		  sdp->removable ? "removable " : "");

	async_schedule(sd_probe_async, sdkp);



	return 0;