linux-kernel - [PATCH 084/117] Staging: hv: storvsc: Get rid of release_stor

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Message-Id: <1310752065-27895-84-git-send-email-kys@microsoft.com>
Date:	Fri, 15 Jul 2011 10:47:12 -0700
From:	"K. Y. Srinivasan" <kys@...rosoft.com>
To:	gregkh@...e.de, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, virtualization@...ts.osdl.org
Cc:	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: [PATCH 084/117] Staging: hv: storvsc: Get rid of release_stor_device() by inlining the code

Get rid of release_stor_device() by inlining the code.

Signed-off-by: K. Y. Srinivasan <kys@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
---
 drivers/staging/hv/storvsc.c |   23 +++++++----------------
 1 files changed, 7 insertions(+), 16 deletions(-)

diff --git a/drivers/staging/hv/storvsc.c b/drivers/staging/hv/storvsc.c
index d1b6c4e..f52e610 100644
--- a/drivers/staging/hv/storvsc.c
+++ b/drivers/staging/hv/storvsc.c
@@ -70,21 +70,6 @@ static inline struct storvsc_device *get_in_stor_device(
 	return stor_device;
 }
 
-/* Drop ref count to 1 to effectively disable get_out_stor_device() */
-static inline struct storvsc_device *release_stor_device(
-					struct hv_device *device)
-{
-	struct storvsc_device *stor_device;
-
-	stor_device = (struct storvsc_device *)device->ext;
-
-	/* Busy wait until the ref drop to 2, then set it to 1 */
-	while (atomic_cmpxchg(&stor_device->ref_count, 2, 1) != 2)
-		udelay(100);
-
-	return stor_device;
-}
-
 /* Drop ref count to 0. No one can use stor_device object. */
 static inline struct storvsc_device *final_release_stor_device(
 			struct hv_device *device)
@@ -406,7 +391,13 @@ int storvsc_dev_remove(struct hv_device *device)
 {
 	struct storvsc_device *stor_device;
 
-	stor_device = release_stor_device(device);
+	/*
+	 * Since we currently hold a reference on the stor
+	 * device, it is safe to dereference the ext
+	 * pointer.
+	 */
+	stor_device = (struct storvsc_device *)device->ext;
+	atomic_dec(&stor_device->ref_count);
 	stor_device->destroy = true;
 
 	/*
-- 
1.7.4.1

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