1 files changed, 67 insertions, 28 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index e5e7d7856454..c0cf4acda7de 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -86,6 +86,12 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
 
+#if !defined(CONFIG_DEBUG_BLOCK_EXT_DEVT)
+#define SD_MINORS	16
+#else
+#define SD_MINORS	0
+#endif
+
 static int  sd_revalidate_disk(struct gendisk *);
 static int  sd_probe(struct device *);
 static int  sd_remove(struct device *);
@@ -159,7 +165,7 @@ sd_store_cache_type(struct device *dev, struct device_attribute *attr,
 			sd_print_sense_hdr(sdkp, &sshdr);
 		return -EINVAL;
 	}
-	sd_revalidate_disk(sdkp->disk);
+	revalidate_disk(sdkp->disk);
 	return count;
 }
 
@@ -377,7 +383,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
 	sector_t block = rq->sector;
 	sector_t threshold;
 	unsigned int this_count = rq->nr_sectors;
-	unsigned int timeout = sdp->timeout;
 	int ret;
 
 	if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
@@ -578,7 +583,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
 	SCpnt->transfersize = sdp->sector_size;
 	SCpnt->underflow = this_count << 9;
 	SCpnt->allowed = SD_MAX_RETRIES;
-	SCpnt->timeout_per_command = timeout;
 
 	/*
 	 * This indicates that the command is ready from our end to be
@@ -910,7 +914,7 @@ static void sd_rescan(struct device *dev)
 	struct scsi_disk *sdkp = scsi_disk_get_from_dev(dev);
 
 	if (sdkp) {
-		sd_revalidate_disk(sdkp->disk);
+		revalidate_disk(sdkp->disk);
 		scsi_disk_put(sdkp);
 	}
 }
@@ -1764,6 +1768,52 @@ static int sd_revalidate_disk(struct gendisk *disk)
 }
 
 /**
+ *	sd_format_disk_name - format disk name
+ *	@prefix: name prefix - ie. "sd" for SCSI disks
+ *	@index: index of the disk to format name for
+ *	@buf: output buffer
+ *	@buflen: length of the output buffer
+ *
+ *	SCSI disk names starts at sda.  The 26th device is sdz and the
+ *	27th is sdaa.  The last one for two lettered suffix is sdzz
+ *	which is followed by sdaaa.
+ *
+ *	This is basically 26 base counting with one extra 'nil' entry
+ *	at the beggining from the second digit on and can be
+ *	determined using similar method as 26 base conversion with the
+ *	index shifted -1 after each digit is computed.
+ *
+ *	CONTEXT:
+ *	Don't care.
+ *
+ *	RETURNS:
+ *	0 on success, -errno on failure.
+ */
+static int sd_format_disk_name(char *prefix, int index, char *buf, int buflen)
+{
+	const int base = 'z' - 'a' + 1;
+	char *begin = buf + strlen(prefix);
+	char *end = buf + buflen;
+	char *p;
+	int unit;
+
+	p = end - 1;
+	*p = '\0';
+	unit = base;
+	do {
+		if (p == begin)
+			return -EINVAL;
+		*--p = 'a' + (index % unit);
+		index = (index / unit) - 1;
+	} while (index >= 0);
+
+	memmove(begin, p, end - p);
+	memcpy(buf, prefix, strlen(prefix));
+
+	return 0;
+}
+
+/**
  *	sd_probe - called during driver initialization and whenever a
  *	new scsi device is attached to the system. It is called once
  *	for each scsi device (not just disks) present.
@@ -1801,7 +1851,7 @@ static int sd_probe(struct device *dev)
 	if (!sdkp)
 		goto out;
 
-	gd = alloc_disk(16);
+	gd = alloc_disk(SD_MINORS);
 	if (!gd)
 		goto out_free;
 
@@ -1815,8 +1865,8 @@ static int sd_probe(struct device *dev)
 	if (error)
 		goto out_put;
 
-	error = -EBUSY;
-	if (index >= SD_MAX_DISKS)
+	error = sd_format_disk_name("sd", index, gd->disk_name, DISK_NAME_LEN);
+	if (error)
 		goto out_free_index;
 
 	sdkp->device = sdp;
@@ -1826,11 +1876,12 @@ static int sd_probe(struct device *dev)
 	sdkp->openers = 0;
 	sdkp->previous_state = 1;
 
-	if (!sdp->timeout) {
+	if (!sdp->request_queue->rq_timeout) {
 		if (sdp->type != TYPE_MOD)
-			sdp->timeout = SD_TIMEOUT;
+			blk_queue_rq_timeout(sdp->request_queue, SD_TIMEOUT);
 		else
-			sdp->timeout = SD_MOD_TIMEOUT;
+			blk_queue_rq_timeout(sdp->request_queue,
+					     SD_MOD_TIMEOUT);
 	}
 
 	device_initialize(&sdkp->dev);
@@ -1843,24 +1894,12 @@ static int sd_probe(struct device *dev)
 
 	get_device(&sdp->sdev_gendev);
 
-	gd->major = sd_major((index & 0xf0) >> 4);
-	gd->first_minor = ((index & 0xf) << 4) | (index & 0xfff00);
-	gd->minors = 16;
-	gd->fops = &sd_fops;
-
-	if (index < 26) {
-		sprintf(gd->disk_name, "sd%c", 'a' + index % 26);
-	} else if (index < (26 + 1) * 26) {
-		sprintf(gd->disk_name, "sd%c%c",
-			'a' + index / 26 - 1,'a' + index % 26);
-	} else {
-		const unsigned int m1 = (index / 26 - 1) / 26 - 1;
-		const unsigned int m2 = (index / 26 - 1) % 26;
-		const unsigned int m3 =  index % 26;
-		sprintf(gd->disk_name, "sd%c%c%c",
-			'a' + m1, 'a' + m2, 'a' + m3);
+	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;
 
@@ -1869,7 +1908,7 @@ static int sd_probe(struct device *dev)
 	blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
 
 	gd->driverfs_dev = &sdp->sdev_gendev;
-	gd->flags = GENHD_FL_DRIVERFS;
+	gd->flags = GENHD_FL_EXT_DEVT | GENHD_FL_DRIVERFS;
 	if (sdp->removable)
 		gd->flags |= GENHD_FL_REMOVABLE;