linux-kernel - [PATCH 078/115] ion: don't use id 0 for handle cookie

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Date:	Fri, 13 Dec 2013 14:24:52 -0800
From:	John Stultz <john.stultz@...aro.org>
To:	LKML <linux-kernel@...r.kernel.org>
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	Android Kernel Team <kernel-team@...roid.com>,
	Sumit Semwal <sumit.semwal@...aro.org>,
	Jesse Barker <jesse.barker@....com>,
	Colin Cross <ccross@...roid.com>,
	John Stultz <john.stultz@...aro.org>
Subject: [PATCH 078/115] ion: don't use id 0 for handle cookie

From: Colin Cross <ccross@...roid.com>

ion userspace clients think that the cookie is a pointer, so they
use NULL to check if the handle has been initialized.  Set the first
id number to 1.

Signed-off-by: Colin Cross <ccross@...roid.com>
[jstultz: modified patch to apply to staging directory]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
 drivers/staging/android/ion/ion.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index ef0b2d7..273ec3a 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -424,7 +424,7 @@ static int ion_handle_add(struct ion_client *client, struct ion_handle *handle)
 		rc = idr_pre_get(&client->idr, GFP_KERNEL);
 		if (!rc)
 			return -ENOMEM;
-		rc = idr_get_new(&client->idr, handle, &id);
+		rc = idr_get_new_above(&client->idr, handle, 1, &id);
 		handle->id = id;
 	} while (rc == -EAGAIN);
 
-- 
1.8.3.2

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