Re: [PATCH] Input: bcm5974.c initialize raw_w, raw_x and raw_y before it get used
From: Jaswinder Singh Rajput <jaswinder@kernel.org>
Date: 2009-09-14 09:01:02
Subsystem:
apple bcm5974 multitouch driver, input (keyboard, mouse, joystick, touchscreen) drivers, the rest · Maintainers:
Henrik Rydberg, Dmitry Torokhov, Linus Torvalds
Hello Henrik, On Sun, 2009-09-13 at 13:39 +0200, Henrik Rydberg wrote:
Jaswinder Singh Rajput wrote:quoted
On Sun, 2009-09-13 at 01:24 +0200, Henrik Rydberg wrote:quoted
Jaswinder Singh Rajput wrote:quoted
raw_w, raw_x and raw_y is used uninitialized for !raw_nThanks for the heads up, but actually not, since !raw_n also implies !(ptest > PRESSURE_LOW).Then can we move 'if (ptest > PRESSURE_LOW && origin)' stuff to 'if (raw_n)'. If not then my patch is correct.Yes, that's it, thanks. So this patch ought to solve the warning cleanly:
hmm, even then there is room for improvement and save some cpu cycles :
diff --git a/drivers/input/mouse/bcm5974.c b/drivers/input/mouse/bcm5974.c
index 2d8fc0b..21ea2e3 100644
--- a/drivers/input/mouse/bcm5974.c
+++ b/drivers/input/mouse/bcm5974.c@@ -316,8 +316,7 @@ static int report_tp_state(struct bcm5974 *dev, int size) const struct bcm5974_config *c = &dev->cfg; const struct tp_finger *f; struct input_dev *input = dev->input; - int raw_p, raw_w, raw_x, raw_y, raw_n; - int ptest = 0, origin = 0, ibt = 0, nmin = 0, nmax = 0; + int raw_n, ibt = 0, nmin = 0, nmax = 0; int abs_p = 0, abs_w = 0, abs_x = 0, abs_y = 0; if (size < c->tp_offset || (size - c->tp_offset) % SIZEOF_FINGER != 0)
@@ -329,6 +328,9 @@ static int report_tp_state(struct bcm5974 *dev, int size) /* always track the first finger; when detached, start over */ if (raw_n) { + int raw_p, raw_w, raw_x, raw_y; + int ptest, origin; + raw_p = raw2int(f->force_major); raw_w = raw2int(f->size_major); raw_x = raw2int(f->abs_x);
And by changing little bit programming logic you can also reduce variable count and save some more cpu cycles. Thanks, -- JSR