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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-07-24 22:53:15 +0200
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2008-07-24 22:53:15 +0200
commit08da591e14cf87247ec09b17c350235157a92fc3 (patch)
treed00a02154071c7013c31bc8dd1d3c12c86d5daca /drivers/ide
parent6cdf6eb357c2681596b7b1672b92396ba82333d4 (diff)
ide: add ide_device_{get,put}() helpers
* Add 'struct ide_host *host' field to ide_hwif_t and set it in ide_host_alloc_all(). * Add ide_device_{get,put}() helpers loosely based on SCSI's scsi_device_{get,put}() ones. * Convert IDE device drivers to use ide_device_{get,put}(). Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide')
-rw-r--r--drivers/ide/ide-cd.c12
-rw-r--r--drivers/ide/ide-disk.c12
-rw-r--r--drivers/ide/ide-floppy.c12
-rw-r--r--drivers/ide/ide-probe.c2
-rw-r--r--drivers/ide/ide-tape.c12
-rw-r--r--drivers/ide/ide.c47
6 files changed, 85 insertions, 12 deletions
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 4e73aeee4053..8f253e5f26a8 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -57,23 +57,29 @@ static DEFINE_MUTEX(idecd_ref_mutex);
#define ide_cd_g(disk) \
container_of((disk)->private_data, struct cdrom_info, driver)
+static void ide_cd_release(struct kref *);
+
static struct cdrom_info *ide_cd_get(struct gendisk *disk)
{
struct cdrom_info *cd = NULL;
mutex_lock(&idecd_ref_mutex);
cd = ide_cd_g(disk);
- if (cd)
+ if (cd) {
kref_get(&cd->kref);
+ if (ide_device_get(cd->drive)) {
+ kref_put(&cd->kref, ide_cd_release);
+ cd = NULL;
+ }
+ }
mutex_unlock(&idecd_ref_mutex);
return cd;
}
-static void ide_cd_release(struct kref *);
-
static void ide_cd_put(struct cdrom_info *cd)
{
mutex_lock(&idecd_ref_mutex);
+ ide_device_put(cd->drive);
kref_put(&cd->kref, ide_cd_release);
mutex_unlock(&idecd_ref_mutex);
}
diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
index df5fe5756871..28d85b410f7c 100644
--- a/drivers/ide/ide-disk.c
+++ b/drivers/ide/ide-disk.c
@@ -56,23 +56,29 @@ static DEFINE_MUTEX(idedisk_ref_mutex);
#define ide_disk_g(disk) \
container_of((disk)->private_data, struct ide_disk_obj, driver)
+static void ide_disk_release(struct kref *);
+
static struct ide_disk_obj *ide_disk_get(struct gendisk *disk)
{
struct ide_disk_obj *idkp = NULL;
mutex_lock(&idedisk_ref_mutex);
idkp = ide_disk_g(disk);
- if (idkp)
+ if (idkp) {
kref_get(&idkp->kref);
+ if (ide_device_get(idkp->drive)) {
+ kref_put(&idkp->kref, ide_disk_release);
+ idkp = NULL;
+ }
+ }
mutex_unlock(&idedisk_ref_mutex);
return idkp;
}
-static void ide_disk_release(struct kref *);
-
static void ide_disk_put(struct ide_disk_obj *idkp)
{
mutex_lock(&idedisk_ref_mutex);
+ ide_device_put(idkp->drive);
kref_put(&idkp->kref, ide_disk_release);
mutex_unlock(&idedisk_ref_mutex);
}
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 3d8e6dd0f41e..ca11a26746f1 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -158,23 +158,29 @@ static DEFINE_MUTEX(idefloppy_ref_mutex);
#define ide_floppy_g(disk) \
container_of((disk)->private_data, struct ide_floppy_obj, driver)
+static void idefloppy_cleanup_obj(struct kref *);
+
static struct ide_floppy_obj *ide_floppy_get(struct gendisk *disk)
{
struct ide_floppy_obj *floppy = NULL;
mutex_lock(&idefloppy_ref_mutex);
floppy = ide_floppy_g(disk);
- if (floppy)
+ if (floppy) {
kref_get(&floppy->kref);
+ if (ide_device_get(floppy->drive)) {
+ kref_put(&floppy->kref, idefloppy_cleanup_obj);
+ floppy = NULL;
+ }
+ }
mutex_unlock(&idefloppy_ref_mutex);
return floppy;
}
-static void idefloppy_cleanup_obj(struct kref *);
-
static void ide_floppy_put(struct ide_floppy_obj *floppy)
{
mutex_lock(&idefloppy_ref_mutex);
+ ide_device_put(floppy->drive);
kref_put(&floppy->kref, idefloppy_cleanup_obj);
mutex_unlock(&idefloppy_ref_mutex);
}
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 890c15b1b3ae..9ab5892eaea1 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -1595,6 +1595,8 @@ struct ide_host *ide_host_alloc_all(const struct ide_port_info *d,
ide_init_port_data(hwif, idx);
+ hwif->host = host;
+
host->ports[i] = hwif;
host->n_ports++;
}
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index 6962ca4891a1..789f3428f072 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -322,23 +322,29 @@ static struct class *idetape_sysfs_class;
#define ide_tape_g(disk) \
container_of((disk)->private_data, struct ide_tape_obj, driver)
+static void ide_tape_release(struct kref *);
+
static struct ide_tape_obj *ide_tape_get(struct gendisk *disk)
{
struct ide_tape_obj *tape = NULL;
mutex_lock(&idetape_ref_mutex);
tape = ide_tape_g(disk);
- if (tape)
+ if (tape) {
kref_get(&tape->kref);
+ if (ide_device_get(tape->drive)) {
+ kref_put(&tape->kref, ide_tape_release);
+ tape = NULL;
+ }
+ }
mutex_unlock(&idetape_ref_mutex);
return tape;
}
-static void ide_tape_release(struct kref *);
-
static void ide_tape_put(struct ide_tape_obj *tape)
{
mutex_lock(&idetape_ref_mutex);
+ ide_device_put(tape->drive);
kref_put(&tape->kref, ide_tape_release);
mutex_unlock(&idetape_ref_mutex);
}
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index 60f0ca66aa93..772451600e4d 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -618,6 +618,53 @@ set_val:
EXPORT_SYMBOL(generic_ide_ioctl);
+/**
+ * ide_device_get - get an additional reference to a ide_drive_t
+ * @drive: device to get a reference to
+ *
+ * Gets a reference to the ide_drive_t and increments the use count of the
+ * underlying LLDD module.
+ */
+int ide_device_get(ide_drive_t *drive)
+{
+ struct device *host_dev;
+ struct module *module;
+
+ if (!get_device(&drive->gendev))
+ return -ENXIO;
+
+ host_dev = drive->hwif->host->dev[0];
+ module = host_dev ? host_dev->driver->owner : NULL;
+
+ if (module && !try_module_get(module)) {
+ put_device(&drive->gendev);
+ return -ENXIO;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ide_device_get);
+
+/**
+ * ide_device_put - release a reference to a ide_drive_t
+ * @drive: device to release a reference on
+ *
+ * Release a reference to the ide_drive_t and decrements the use count of
+ * the underlying LLDD module.
+ */
+void ide_device_put(ide_drive_t *drive)
+{
+#ifdef CONFIG_MODULE_UNLOAD
+ struct device *host_dev = drive->hwif->host->dev[0];
+ struct module *module = host_dev ? host_dev->driver->owner : NULL;
+
+ if (module)
+ module_put(module);
+#endif
+ put_device(&drive->gendev);
+}
+EXPORT_SYMBOL_GPL(ide_device_put);
+
static int ide_bus_match(struct device *dev, struct device_driver *drv)
{
return 1;