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Message-Id: <1359854463-2538-46-git-send-email-tj@kernel.org>
Date: Sat, 2 Feb 2013 17:20:46 -0800
From: Tejun Heo <tj@...nel.org>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
bfields@...ldses.org, skinsbursky@...allels.com,
ebiederm@...ssion.com, jmorris@...ei.org, axboe@...nel.dk,
Tejun Heo <tj@...nel.org>,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
linux-scsi@...r.kernel.org
Subject: [PATCH 45/62] scsi: convert to idr_alloc()
Convert to the much saner new idr interface.
Only compile tested.
Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Cc: linux-scsi@...r.kernel.org
---
This patch depends on an earlier idr changes and I think it would be
best to route these together through -mm. Please holler if there's
any objection. Thanks.
drivers/scsi/ch.c | 21 +++++++++------------
drivers/scsi/sg.c | 43 +++++++++++++++++--------------------------
drivers/scsi/st.c | 27 ++++++++-------------------
3 files changed, 34 insertions(+), 57 deletions(-)
diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c
index a15474e..2a32374 100644
--- a/drivers/scsi/ch.c
+++ b/drivers/scsi/ch.c
@@ -895,7 +895,7 @@ static int ch_probe(struct device *dev)
{
struct scsi_device *sd = to_scsi_device(dev);
struct device *class_dev;
- int minor, ret = -ENOMEM;
+ int ret;
scsi_changer *ch;
if (sd->type != TYPE_MEDIUM_CHANGER)
@@ -905,22 +905,19 @@ static int ch_probe(struct device *dev)
if (NULL == ch)
return -ENOMEM;
- if (!idr_pre_get(&ch_index_idr, GFP_KERNEL))
- goto free_ch;
-
+ idr_preload(GFP_KERNEL);
spin_lock(&ch_index_lock);
- ret = idr_get_new(&ch_index_idr, ch, &minor);
+ ret = idr_alloc(&ch_index_idr, ch, 0, CH_MAX_DEVS + 1, GFP_NOWAIT);
spin_unlock(&ch_index_lock);
+ idr_preload_end();
- if (ret)
+ if (ret < 0) {
+ if (ret == -ENOSPC)
+ ret = -ENODEV;
goto free_ch;
-
- if (minor > CH_MAX_DEVS) {
- ret = -ENODEV;
- goto remove_idr;
}
- ch->minor = minor;
+ ch->minor = ret;
sprintf(ch->name,"ch%d",ch->minor);
class_dev = device_create(ch_sysfs_class, dev,
@@ -944,7 +941,7 @@ static int ch_probe(struct device *dev)
return 0;
remove_idr:
- idr_remove(&ch_index_idr, minor);
+ idr_remove(&ch_index_idr, ch->minor);
free_ch:
kfree(ch);
return ret;
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index be2c9a6..9f0c465 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1391,24 +1391,23 @@ static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
return ERR_PTR(-ENOMEM);
}
- if (!idr_pre_get(&sg_index_idr, GFP_KERNEL)) {
- printk(KERN_WARNING "idr expansion Sg_device failure\n");
- error = -ENOMEM;
- goto out;
- }
-
+ idr_preload(GFP_KERNEL);
write_lock_irqsave(&sg_index_lock, iflags);
- error = idr_get_new(&sg_index_idr, sdp, &k);
- if (error) {
- write_unlock_irqrestore(&sg_index_lock, iflags);
- printk(KERN_WARNING "idr allocation Sg_device failure: %d\n",
- error);
- goto out;
+ error = idr_alloc(&sg_index_idr, sdp, 0, SG_MAX_DEVS, GFP_NOWAIT);
+ if (error < 0) {
+ if (error == -ENOSPC) {
+ sdev_printk(KERN_WARNING, scsidp,
+ "Unable to attach sg device type=%d, minor number exceeds %d\n",
+ scsidp->type, SG_MAX_DEVS - 1);
+ error = -ENODEV;
+ } else {
+ printk(KERN_WARNING
+ "idr allocation Sg_device failure: %d\n", error);
+ }
+ goto out_unlock;
}
-
- if (unlikely(k >= SG_MAX_DEVS))
- goto overflow;
+ k = error;
SCSI_LOG_TIMEOUT(3, printk("sg_alloc: dev=%d \n", k));
sprintf(disk->disk_name, "sg%d", k);
@@ -1420,25 +1419,17 @@ static Sg_device *sg_alloc(struct gendisk *disk, struct scsi_device *scsidp)
sdp->sg_tablesize = queue_max_segments(q);
sdp->index = k;
kref_init(&sdp->d_ref);
+ error = 0;
+out_unlock:
write_unlock_irqrestore(&sg_index_lock, iflags);
+ idr_preload_end();
- error = 0;
- out:
if (error) {
kfree(sdp);
return ERR_PTR(error);
}
return sdp;
-
- overflow:
- idr_remove(&sg_index_idr, k);
- write_unlock_irqrestore(&sg_index_lock, iflags);
- sdev_printk(KERN_WARNING, scsidp,
- "Unable to attach sg device type=%d, minor "
- "number exceeds %d\n", scsidp->type, SG_MAX_DEVS - 1);
- error = -ENODEV;
- goto out;
}
static int
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 98156a9..7c6edca 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -4076,7 +4076,7 @@ static int st_probe(struct device *dev)
struct st_modedef *STm;
struct st_partstat *STps;
struct st_buffer *buffer;
- int i, dev_num, error;
+ int i, error;
char *stp;
if (SDp->type != TYPE_TAPE)
@@ -4178,27 +4178,17 @@ static int st_probe(struct device *dev)
tpnt->blksize_changed = 0;
mutex_init(&tpnt->lock);
- if (!idr_pre_get(&st_index_idr, GFP_KERNEL)) {
- pr_warn("st: idr expansion failed\n");
- error = -ENOMEM;
- goto out_put_disk;
- }
-
+ idr_preload(GFP_KERNEL);
spin_lock(&st_index_lock);
- error = idr_get_new(&st_index_idr, tpnt, &dev_num);
+ error = idr_alloc(&st_index_idr, tpnt, 0, ST_MAX_TAPES + 1, GFP_NOWAIT);
spin_unlock(&st_index_lock);
- if (error) {
+ idr_preload_end();
+ if (error < 0) {
pr_warn("st: idr allocation failed: %d\n", error);
goto out_put_disk;
}
-
- if (dev_num > ST_MAX_TAPES) {
- pr_err("st: Too many tape devices (max. %d).\n", ST_MAX_TAPES);
- goto out_put_index;
- }
-
- tpnt->index = dev_num;
- sprintf(disk->disk_name, "st%d", dev_num);
+ tpnt->index = error;
+ sprintf(disk->disk_name, "st%d", tpnt->index);
dev_set_drvdata(dev, tpnt);
@@ -4218,9 +4208,8 @@ static int st_probe(struct device *dev)
out_remove_devs:
remove_cdevs(tpnt);
-out_put_index:
spin_lock(&st_index_lock);
- idr_remove(&st_index_idr, dev_num);
+ idr_remove(&st_index_idr, tpnt->index);
spin_unlock(&st_index_lock);
out_put_disk:
put_disk(disk);
--
1.8.1
--
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