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Subject[PATCH 25/40] Staging: hv: storvsc: Add state to manage the lifecycle of emulated HBA
Date
We setup a single emulated HBA for managing all IDE devices. To properly
deal with unloading of the driver, establish state to track who
should cleanup the emulated HBA.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Abhishek Kane <v-abkane@microsoft.com>
Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
---
drivers/staging/hv/hyperv_storage.h | 1 +
drivers/staging/hv/storvsc.c | 1 +
drivers/staging/hv/storvsc_drv.c | 9 ++++++++-
3 files changed, 10 insertions(+), 1 deletions(-)

diff --git a/drivers/staging/hv/hyperv_storage.h b/drivers/staging/hv/hyperv_storage.h
index a15a53b..865ede1 100644
--- a/drivers/staging/hv/hyperv_storage.h
+++ b/drivers/staging/hv/hyperv_storage.h
@@ -281,6 +281,7 @@ struct storvsc_device {
int ref_count;
bool destroy;
bool drain_notify;
+ bool hba_owner;
atomic_t num_outstanding_req;

wait_queue_head_t waiting_to_drain;
diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index 4d13044..c06f750 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -42,6 +42,7 @@ static inline struct storvsc_device *alloc_stor_device(struct hv_device *device)

stor_device->ref_count = 1;
stor_device->destroy = false;
+ stor_device->hba_owner = false;
init_waitqueue_head(&stor_device->waiting_to_drain);
stor_device->device = device;
device->ext = stor_device;
diff --git a/drivers/staging/hv/storvsc_drv.c b/drivers/staging/hv/storvsc_drv.c
index fcc3f5d..898a311 100644
--- a/drivers/staging/hv/storvsc_drv.c
+++ b/drivers/staging/hv/storvsc_drv.c
@@ -349,6 +349,10 @@ static int storvsc_remove(struct hv_device *dev)
struct Scsi_Host *host = dev_get_drvdata(&dev->device);
struct hv_host_device *host_dev =
(struct hv_host_device *)host->hostdata;
+ struct storvsc_device *stor_dev = dev->ext;
+
+ if (!stor_dev->hba_owner)
+ return 0;

scsi_remove_host(host);

@@ -743,7 +747,10 @@ static int storvsc_probe(struct hv_device *device)
scsi_host_put(host);
return -ENODEV;
}
-
+ /*
+ * This stor device owns the HBA; capture that state.
+ */
+ ((struct storvsc_device *)device->ext)->hba_owner = true;
host_dev->path = device_info.path_id;
host_dev->target = device_info.target_id;

--
1.7.4.1


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