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authorStephen M. Cameron <scameron@beardog.cce.hp.com>2009-09-17 13:47:34 -0500
committerJens Axboe <jens.axboe@oracle.com>2009-10-01 21:15:42 +0200
commit8ce51966d3b809d6c1ae4f3902058558589480b8 (patch)
tree7bedabeeabbb353fc46e4a82954342dfd1eeb4e2
parent361e9b07d11cfc8b77921a0e96910019402efe79 (diff)
downloadlinux-8ce51966d3b809d6c1ae4f3902058558589480b8.tar.bz2
cciss: Handle special case for sysfs attributes of the first logical drive.
For c0dx where x is not 0, we handle deletion and addition simply, but for c0d0, there is the special case that even when there's no disk, the device node exists so that the controller may be accessed. So, for c0d0, we only create the sysfs entries once, when a controller is added, and only remove them once, when a controller is being taken down. Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com> Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
-rw-r--r--drivers/block/cciss.c18
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/block/cciss.c b/drivers/block/cciss.c
index ced71b006cd7..aa95eeb30206 100644
--- a/drivers/block/cciss.c
+++ b/drivers/block/cciss.c
@@ -682,6 +682,10 @@ static long cciss_create_ld_sysfs_entry(struct ctlr_info *h,
{
struct device *dev;
+ /* Special case for c*d0, we only create it once. */
+ if (drv_index == 0 && h->drv[drv_index].dev != NULL)
+ return 0;
+
dev = kzalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return -ENOMEM;
@@ -698,9 +702,15 @@ static long cciss_create_ld_sysfs_entry(struct ctlr_info *h,
/*
* Remove sysfs entries for a logical drive.
*/
-static void cciss_destroy_ld_sysfs_entry(struct ctlr_info *h, int drv_index)
+static void cciss_destroy_ld_sysfs_entry(struct ctlr_info *h, int drv_index,
+ int ctlr_exiting)
{
struct device *dev = h->drv[drv_index].dev;
+
+ /* special case for c*d0, we only destroy it on controller exit */
+ if (drv_index == 0 && !ctlr_exiting)
+ return;
+
device_del(dev);
put_device(dev); /* the "final" put. */
h->drv[drv_index].dev = NULL;
@@ -1920,6 +1930,7 @@ static int cciss_add_gendisk(ctlr_info_t *h, __u32 lunid, int controller_node)
drv_index = cciss_find_free_drive_index(h->ctlr, controller_node);
if (drv_index == -1)
return -1;
+
/*Check if the gendisk needs to be allocated */
if (!h->gendisk[drv_index]) {
h->gendisk[drv_index] =
@@ -2165,7 +2176,7 @@ static int deregister_disk(ctlr_info_t *h, int drv_index,
if (h->gendisk[0] != disk) {
struct request_queue *q = disk->queue;
if (disk->flags & GENHD_FL_UP) {
- cciss_destroy_ld_sysfs_entry(h, drv_index);
+ cciss_destroy_ld_sysfs_entry(h, drv_index, 0);
del_gendisk(disk);
}
if (q) {
@@ -2211,7 +2222,6 @@ static int deregister_disk(ctlr_info_t *h, int drv_index,
* indicate that this element of the drive
* array is free.
*/
-
if (clear_all) {
/* check to see if it was the last disk */
if (drv == h->drv + h->highest_lun) {
@@ -4329,7 +4339,7 @@ static void __devexit cciss_remove_one(struct pci_dev *pdev)
struct request_queue *q = disk->queue;
if (disk->flags & GENHD_FL_UP) {
- cciss_destroy_ld_sysfs_entry(hba[i], j);
+ cciss_destroy_ld_sysfs_entry(hba[i], j, 1);
del_gendisk(disk);
}
if (q)