diff options
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/kfifo.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/kfifo.c b/kernel/kfifo.c index b50bb622e8b..7384f120be8 100644 --- a/kernel/kfifo.c +++ b/kernel/kfifo.c | |||
@@ -302,6 +302,27 @@ unsigned int kfifo_out(struct kfifo *fifo, void *to, unsigned int len) | |||
302 | } | 302 | } |
303 | EXPORT_SYMBOL(kfifo_out); | 303 | EXPORT_SYMBOL(kfifo_out); |
304 | 304 | ||
305 | /** | ||
306 | * kfifo_out_peek - copy some data from the FIFO, but do not remove it | ||
307 | * @fifo: the fifo to be used. | ||
308 | * @to: where the data must be copied. | ||
309 | * @len: the size of the destination buffer. | ||
310 | * @offset: offset into the fifo | ||
311 | * | ||
312 | * This function copies at most @len bytes at @offset from the FIFO | ||
313 | * into the @to buffer and returns the number of copied bytes. | ||
314 | * The data is not removed from the FIFO. | ||
315 | */ | ||
316 | unsigned int kfifo_out_peek(struct kfifo *fifo, void *to, unsigned int len, | ||
317 | unsigned offset) | ||
318 | { | ||
319 | len = min(kfifo_len(fifo), len + offset); | ||
320 | |||
321 | __kfifo_out_data(fifo, to, len, offset); | ||
322 | return len; | ||
323 | } | ||
324 | EXPORT_SYMBOL(kfifo_out_peek); | ||
325 | |||
305 | unsigned int __kfifo_out_generic(struct kfifo *fifo, | 326 | unsigned int __kfifo_out_generic(struct kfifo *fifo, |
306 | void *to, unsigned int len, unsigned int recsize, | 327 | void *to, unsigned int len, unsigned int recsize, |
307 | unsigned int *total) | 328 | unsigned int *total) |