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sd: Convert to new IDA API 

Allows us to remove an explicit spinlock.

Signed-off-by: Matthew Wilcox <willy@infradead.org>
This commit is contained in:
Matthew Wilcox 2018-06-11 15:26:27 -04:00
parent 0f0a0e54a2
commit 9401508012
1 changed files with 4 additions and 17 deletions
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21
drivers/scsi/sd.c
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@ -123,7 +123,6 @@ static void scsi_disk_release(struct device *cdev);
static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
static void sd_print_result(const struct scsi_disk *, const char *, int);
static DEFINE_SPINLOCK(sd_index_lock);
static DEFINE_IDA(sd_index_ida);
/* This semaphore is used to mediate the 0->1 reference get in the
@ -3339,16 +3338,8 @@ static int sd_probe(struct device *dev)
if (!gd)
goto out_free;
do {
if (!ida_pre_get(&sd_index_ida, GFP_KERNEL))
goto out_put;
spin_lock(&sd_index_lock);
error = ida_get_new(&sd_index_ida, &index);
spin_unlock(&sd_index_lock);
} while (error == -EAGAIN);
if (error) {
index = ida_alloc(&sd_index_ida, GFP_KERNEL);
if (index < 0) {
sdev_printk(KERN_WARNING, sdp, "sd_probe: memory exhausted.\n");
goto out_put;
}
@ -3392,9 +3383,7 @@ static int sd_probe(struct device *dev)
return 0;
out_free_index:
spin_lock(&sd_index_lock);
ida_remove(&sd_index_ida, index);
spin_unlock(&sd_index_lock);
ida_free(&sd_index_ida, index);
out_put:
put_disk(gd);
out_free:
@ -3459,9 +3448,7 @@ static void scsi_disk_release(struct device *dev)
struct scsi_disk *sdkp = to_scsi_disk(dev);
struct gendisk *disk = sdkp->disk;
spin_lock(&sd_index_lock);
ida_remove(&sd_index_ida, sdkp->index);
spin_unlock(&sd_index_lock);
ida_free(&sd_index_ida, sdkp->index);
disk->private_data = NULL;
put_disk(disk);