diff mbox

[v2,2/4] HID: i2c-hid: reorder allocation/free of buffers

Message ID 1354716176-12558-3-git-send-email-benjamin.tissoires@gmail.com (mailing list archive)
State New, archived
Delegated to: Jiri Kosina
Headers show

Commit Message

Benjamin Tissoires Dec. 5, 2012, 2:02 p.m. UTC 
Simplifies i2c_hid_alloc_buffers tests, and makes this function
responsible of the assignment of ihid->bufsize.
The condition for the reallocation in i2c_hid_start is then simpler.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
Reviewed-by: Jean Delvare <khali@linux-fr.org>
---
 drivers/hid/i2c-hid/i2c-hid.c | 68 ++++++++++++++++++-------------------------
 1 file changed, 28 insertions(+), 40 deletions(-)

Comments

Jiri Kosina Dec. 6, 2012, 9:56 a.m. UTC | #1 
On Wed, 5 Dec 2012, Benjamin Tissoires wrote:

> Simplifies i2c_hid_alloc_buffers tests, and makes this function
> responsible of the assignment of ihid->bufsize.
> The condition for the reallocation in i2c_hid_start is then simpler.
> 
> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@gmail.com>
> Reviewed-by: Jean Delvare <khali@linux-fr.org>
> ---
>  drivers/hid/i2c-hid/i2c-hid.c | 68 ++++++++++++++++++-------------------------
>  1 file changed, 28 insertions(+), 40 deletions(-)
> 
> diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
> index 34cca42..d00f185 100644
> --- a/drivers/hid/i2c-hid/i2c-hid.c
> +++ b/drivers/hid/i2c-hid/i2c-hid.c
> @@ -464,48 +464,38 @@ static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
>  	}
>  }
>  
> -static int i2c_hid_alloc_buffers(struct i2c_hid *ihid)
> +static void i2c_hid_free_buffers(struct i2c_hid *ihid)
> +{
> +	kfree(ihid->inbuf);
> +	kfree(ihid->argsbuf);
> +	kfree(ihid->cmdbuf);
> +	ihid->inbuf = NULL;
> +	ihid->cmdbuf = NULL;
> +	ihid->argsbuf = NULL;
> +	ihid->bufsize = 0;
> +}
> +
> +static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
>  {
>  	/* the worst case is computed from the set_report command with a
>  	 * reportID > 15 and the maximum report length */
>  	int args_len = sizeof(__u8) + /* optional ReportID byte */
>  		       sizeof(__u16) + /* data register */
>  		       sizeof(__u16) + /* size of the report */
> -		       ihid->bufsize; /* report */
> -
> -	ihid->inbuf = kzalloc(ihid->bufsize, GFP_KERNEL);
> -
> -	if (!ihid->inbuf)
> -		return -ENOMEM;
> +		       report_size; /* report */
>  
> +	ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
>  	ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
> -
> -	if (!ihid->argsbuf) {
> -		kfree(ihid->inbuf);
> -		return -ENOMEM;
> -	}
> -
>  	ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
>  
> -	if (!ihid->cmdbuf) {
> -		kfree(ihid->inbuf);
> -		kfree(ihid->argsbuf);
> -		ihid->inbuf = NULL;
> -		ihid->argsbuf = NULL;
> +	if (!ihid->inbuf || !ihid->argsbuf || !ihid->cmdbuf) {
> +		i2c_hid_free_buffers(ihid);
>  		return -ENOMEM;
>  	}
>  
> -	return 0;
> -}
> +	ihid->bufsize = report_size;
>  
> -static void i2c_hid_free_buffers(struct i2c_hid *ihid)
> -{
> -	kfree(ihid->inbuf);
> -	kfree(ihid->argsbuf);
> -	kfree(ihid->cmdbuf);
> -	ihid->inbuf = NULL;
> -	ihid->cmdbuf = NULL;
> -	ihid->argsbuf = NULL;
> +	return 0;
>  }
>  
>  static int i2c_hid_get_raw_report(struct hid_device *hid,
> @@ -610,22 +600,19 @@ static int i2c_hid_start(struct hid_device *hid)
>  	struct i2c_client *client = hid->driver_data;
>  	struct i2c_hid *ihid = i2c_get_clientdata(client);
>  	int ret;
> -	int old_bufsize = ihid->bufsize;
> +	unsigned int bufsize = HID_MIN_BUFFER_SIZE;
>  
> -	ihid->bufsize = HID_MIN_BUFFER_SIZE;
> -	i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &ihid->bufsize);
> -	i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &ihid->bufsize);
> -	i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &ihid->bufsize);
> +	i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
> +	i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
> +	i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
>  
> -	if (ihid->bufsize > old_bufsize || !ihid->inbuf || !ihid->cmdbuf) {
> +	if (bufsize > ihid->bufsize) {
>  		i2c_hid_free_buffers(ihid);
>  
> -		ret = i2c_hid_alloc_buffers(ihid);
> +		ret = i2c_hid_alloc_buffers(ihid, bufsize);
>  
> -		if (ret) {
> -			ihid->bufsize = old_bufsize;
> +		if (ret)
>  			return ret;
> -		}
>  	}
>  
>  	if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
> @@ -849,8 +836,9 @@ static int __devinit i2c_hid_probe(struct i2c_client *client,
>  	/* we need to allocate the command buffer without knowing the maximum
>  	 * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
>  	 * real computation later. */
> -	ihid->bufsize = HID_MIN_BUFFER_SIZE;
> -	i2c_hid_alloc_buffers(ihid);
> +	ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
> +	if (ret < 0)
> +		goto err;
>  
>  	ret = i2c_hid_fetch_hid_descriptor(ihid);
>  	if (ret < 0)

Applied, thank you.
diff mbox

Patch

diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
index 34cca42..d00f185 100644
--- a/drivers/hid/i2c-hid/i2c-hid.c
+++ b/drivers/hid/i2c-hid/i2c-hid.c
@@ -464,48 +464,38 @@  static void i2c_hid_find_max_report(struct hid_device *hid, unsigned int type,
 	}
 }
 
-static int i2c_hid_alloc_buffers(struct i2c_hid *ihid)
+static void i2c_hid_free_buffers(struct i2c_hid *ihid)
+{
+	kfree(ihid->inbuf);
+	kfree(ihid->argsbuf);
+	kfree(ihid->cmdbuf);
+	ihid->inbuf = NULL;
+	ihid->cmdbuf = NULL;
+	ihid->argsbuf = NULL;
+	ihid->bufsize = 0;
+}
+
+static int i2c_hid_alloc_buffers(struct i2c_hid *ihid, size_t report_size)
 {
 	/* the worst case is computed from the set_report command with a
 	 * reportID > 15 and the maximum report length */
 	int args_len = sizeof(__u8) + /* optional ReportID byte */
 		       sizeof(__u16) + /* data register */
 		       sizeof(__u16) + /* size of the report */
-		       ihid->bufsize; /* report */
-
-	ihid->inbuf = kzalloc(ihid->bufsize, GFP_KERNEL);
-
-	if (!ihid->inbuf)
-		return -ENOMEM;
+		       report_size; /* report */
 
+	ihid->inbuf = kzalloc(report_size, GFP_KERNEL);
 	ihid->argsbuf = kzalloc(args_len, GFP_KERNEL);
-
-	if (!ihid->argsbuf) {
-		kfree(ihid->inbuf);
-		return -ENOMEM;
-	}
-
 	ihid->cmdbuf = kzalloc(sizeof(union command) + args_len, GFP_KERNEL);
 
-	if (!ihid->cmdbuf) {
-		kfree(ihid->inbuf);
-		kfree(ihid->argsbuf);
-		ihid->inbuf = NULL;
-		ihid->argsbuf = NULL;
+	if (!ihid->inbuf || !ihid->argsbuf || !ihid->cmdbuf) {
+		i2c_hid_free_buffers(ihid);
 		return -ENOMEM;
 	}
 
-	return 0;
-}
+	ihid->bufsize = report_size;
 
-static void i2c_hid_free_buffers(struct i2c_hid *ihid)
-{
-	kfree(ihid->inbuf);
-	kfree(ihid->argsbuf);
-	kfree(ihid->cmdbuf);
-	ihid->inbuf = NULL;
-	ihid->cmdbuf = NULL;
-	ihid->argsbuf = NULL;
+	return 0;
 }
 
 static int i2c_hid_get_raw_report(struct hid_device *hid,
@@ -610,22 +600,19 @@  static int i2c_hid_start(struct hid_device *hid)
 	struct i2c_client *client = hid->driver_data;
 	struct i2c_hid *ihid = i2c_get_clientdata(client);
 	int ret;
-	int old_bufsize = ihid->bufsize;
+	unsigned int bufsize = HID_MIN_BUFFER_SIZE;
 
-	ihid->bufsize = HID_MIN_BUFFER_SIZE;
-	i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &ihid->bufsize);
-	i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &ihid->bufsize);
-	i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &ihid->bufsize);
+	i2c_hid_find_max_report(hid, HID_INPUT_REPORT, &bufsize);
+	i2c_hid_find_max_report(hid, HID_OUTPUT_REPORT, &bufsize);
+	i2c_hid_find_max_report(hid, HID_FEATURE_REPORT, &bufsize);
 
-	if (ihid->bufsize > old_bufsize || !ihid->inbuf || !ihid->cmdbuf) {
+	if (bufsize > ihid->bufsize) {
 		i2c_hid_free_buffers(ihid);
 
-		ret = i2c_hid_alloc_buffers(ihid);
+		ret = i2c_hid_alloc_buffers(ihid, bufsize);
 
-		if (ret) {
-			ihid->bufsize = old_bufsize;
+		if (ret)
 			return ret;
-		}
 	}
 
 	if (!(hid->quirks & HID_QUIRK_NO_INIT_REPORTS))
@@ -849,8 +836,9 @@  static int __devinit i2c_hid_probe(struct i2c_client *client,
 	/* we need to allocate the command buffer without knowing the maximum
 	 * size of the reports. Let's use HID_MIN_BUFFER_SIZE, then we do the
 	 * real computation later. */
-	ihid->bufsize = HID_MIN_BUFFER_SIZE;
-	i2c_hid_alloc_buffers(ihid);
+	ret = i2c_hid_alloc_buffers(ihid, HID_MIN_BUFFER_SIZE);
+	if (ret < 0)
+		goto err;
 
 	ret = i2c_hid_fetch_hid_descriptor(ihid);
 	if (ret < 0)