[PATCH 09/11] staging: comedi: comedi_buf: clarify comedi_buf_read_alloc()

[H Hartley Sweeten]

On Wednesday, January 02, 2013 6:52 AM, Ian Abbott wrote:
> On 2012-12-21 16:42, H Hartley Sweeten wrote:
>> Clarify the check to make sure the number of bytes to allocate is
>> available.
>>
>> Signed-off-by: H Hartley Sweeten <hsweeten at visionengravers.com>
>> Cc: Ian Abbott <abbobbi at mev.co.uk>
>> Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
>> ---
>>   drivers/staging/comedi/comedi_buf.c | 8 ++++----
>>   1 file changed, 4 insertions(+), 4 deletions(-)
>>
>> diff --git a/drivers/staging/comedi/comedi_buf.c b/drivers/staging/comedi/comedi_buf.c
>> index 246f577..1ec5aaa 100644
>> --- a/drivers/staging/comedi/comedi_buf.c
>> +++ b/drivers/staging/comedi/comedi_buf.c
>> @@ -298,10 +298,10 @@ EXPORT_SYMBOL(comedi_buf_read_n_available);
>>   /* allocates a chunk for the reader from filled (and munged) buffer space */
>>   unsigned comedi_buf_read_alloc(struct comedi_async *async, unsigned nbytes)
>>   {
>> -	if ((int)(async->buf_read_alloc_count + nbytes - async->munge_count) >
>> -	    0) {
>> -		nbytes = async->munge_count - async->buf_read_alloc_count;
>> -	}
>> +	int available = async->munge_count - async->buf_read_alloc_count;
>
> Minor nit-pick: that should be an unsigned int.

Will the munge_count always be larger, or equal, to the buf_read_alloc_count?
The original code had the (int) cast so I wasn't sure. If so, then yes the variable
should be an unsigned int.

Regards,
Hartley