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tty: n_tty: deduplicate copy code in n_tty_receive_buf_real_raw()

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The code is duplicated to perform the copy twice -- to handle buffer
wrap-around. Instead of the duplication, roll this into the loop.

(And add some blank lines around to have the code a bit more readable.)

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20230827074147.2287-15-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE) 2023-08-27 09:41:47 +02:00 • committed by Greg Kroah-Hartman
parent 2aa91851ff
commit a84853c595
1 changed files with 10 additions and 11 deletions
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21
drivers/tty/n_tty.c
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@ -1528,19 +1528,18 @@ n_tty_receive_buf_real_raw(const struct tty_struct *tty, const u8 *cp,
size_t count) size_t count)
{ {
struct n_tty_data *ldata = tty->disc_data; struct n_tty_data *ldata = tty->disc_data;
size_t n, head;
head = MASK(ldata->read_head); /* handle buffer wrap-around by a loop */
n = min(count, N_TTY_BUF_SIZE - head); for (unsigned int i = 0; i < 2; i++) {
memcpy(read_buf_addr(ldata, head), cp, n); size_t head = MASK(ldata->read_head);
ldata->read_head += n; size_t n = min(count, N_TTY_BUF_SIZE - head);
cp += n;
count -= n;
head = MASK(ldata->read_head); memcpy(read_buf_addr(ldata, head), cp, n);
n = min(count, N_TTY_BUF_SIZE - head);
memcpy(read_buf_addr(ldata, head), cp, n); ldata->read_head += n;
ldata->read_head += n; cp += n;
count -= n;
}
} }
static void static void