linux-kernel - [PATCH] staging: goldfish_audio.c: sparse warning of incorrect type

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Date:	Sun, 31 Aug 2014 21:46:22 +0530
From:	Sudip Mukherjee <sudipm.mukherjee@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Sudip Mukherjee <sudipm.mukherjee@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: [PATCH] staging: goldfish_audio.c: sparse warning of incorrect type

fixed sparse warning of incorrect type in argument 1 and incorrect type in argument 2
it was directly dereferencing a __iomem pointer , which will work in x86 but will fail in other architectures.

Signed-off-by: Sudip Mukherjee <sudip@...torindia.org>
---

hi,
can you please reveiew the patch and check if the approach is correct. If it is correct then I can send another patch to correct the other similar warnings present in this file. 

 drivers/staging/goldfish/goldfish_audio.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/goldfish/goldfish_audio.c b/drivers/staging/goldfish/goldfish_audio.c
index c89d0b8..f9a13e7 100644
--- a/drivers/staging/goldfish/goldfish_audio.c
+++ b/drivers/staging/goldfish/goldfish_audio.c
@@ -118,6 +118,7 @@ static ssize_t goldfish_audio_read(struct file *fp, char __user *buf,
 	struct goldfish_audio *data = fp->private_data;
 	int length;
 	int result = 0;
+	void *buffer;
 
 	if (!data->read_supported)
 		return -ENODEV;
@@ -133,9 +134,15 @@ static ssize_t goldfish_audio_read(struct file *fp, char __user *buf,
 						AUDIO_READ_BUFFER_AVAILABLE);
 
 		/* copy data to user space */
-		if (copy_to_user(buf, data->read_buffer, length))
+		buffer = kzalloc(length, GFP_KERNEL);
+		if (buffer == NULL)
+			return -ENOMEM;
+		memcpy_fromio(buffer, data->read_buffer, length);
+		if (copy_to_user((void __user *)buf, buffer, length)) {
+			kfree(buffer);
 			return -EFAULT;
-
+		}
+		kfree(buffer);
 		result += length;
 		buf += length;
 		count -= length;
-- 
1.8.1.2

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