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Date: Sun, 30 Oct 2011 11:36:19 -0400 From: Chase Douglas <chase.douglas@...onical.com> To: Seth Forshee <seth.forshee@...onical.com> CC: Dmitry Torokhov <dmitry.torokhov@...il.com>, Alessandro Rubini <rubini@...l.unipv.it>, Henrik Rydberg <rydberg@...omail.se>, Andrew Skalski <askalski@...il.com>, linux-input@...r.kernel.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH 4/7] Input: ALPS - Remove assumptions about packet size On 10/26/2011 05:14 PM, Seth Forshee wrote: > In preparation for version 4 protocol support, which has 8-byte > data packets, remove all hard-coded assumptions about packet size > and use psmouse->pktsize instead. > > Signed-off-by: Seth Forshee <seth.forshee@...onical.com> > --- > drivers/input/mouse/alps.c | 27 ++++++++++++++++++--------- > 1 files changed, 18 insertions(+), 9 deletions(-) > > diff --git a/drivers/input/mouse/alps.c b/drivers/input/mouse/alps.c > index 572cb21..14d1f64 100644 > --- a/drivers/input/mouse/alps.c > +++ b/drivers/input/mouse/alps.c > @@ -315,7 +315,7 @@ static void alps_flush_packet(unsigned long data) > > serio_pause_rx(psmouse->ps2dev.serio); > > - if (psmouse->pktcnt == 6) { > + if (psmouse->pktcnt == psmouse->pktsize) { > > /* > * We did not any more data in reasonable amount of time. > @@ -365,15 +365,15 @@ static psmouse_ret_t alps_process_byte(struct psmouse *psmouse) > return PSMOUSE_BAD_DATA; > } > > - /* Bytes 2 - 6 should have 0 in the highest bit */ > - if (psmouse->pktcnt >= 2 && psmouse->pktcnt <= 6 && > + /* Bytes 2 - pktsize should have 0 in the highest bit */ > + if (psmouse->pktcnt >= 2 && psmouse->pktcnt <= psmouse->pktsize && > (psmouse->packet[psmouse->pktcnt - 1] & 0x80)) { > dbg("refusing packet[%i] = %x\n", > psmouse->pktcnt - 1, psmouse->packet[psmouse->pktcnt - 1]); > return PSMOUSE_BAD_DATA; > } > > - if (psmouse->pktcnt == 6) { > + if (psmouse->pktcnt == psmouse->pktsize) { > alps_process_packet(psmouse); > return PSMOUSE_FULL_PACKET; > } > @@ -531,8 +531,13 @@ static int alps_tap_mode(struct psmouse *psmouse, int enable) > static int alps_poll(struct psmouse *psmouse) > { > struct alps_data *priv = psmouse->private; > - unsigned char buf[6]; > + unsigned char *buf; > bool poll_failed; > + int ret = -1; > + > + buf = kmalloc(psmouse->pktsize, GFP_KERNEL); > + if (!buf) > + return -1; Can we preallocate a buffer somewhere instead of allocating every time we enter the function? If we know the maximum packet size we could allocate on the stack instead. -- Chase -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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