Hello.
On 03/03/2015 03:24 AM, Laurent Pinchart wrote:
Sorry for the belated reply, I was switched to EtherAVB soon after posting
this patch. :-)
The pin array handled by sh_pfc_map_pins() may contain holes representing
non- existing pins. We have to first count the valid pins in order to
calculate the size of the memory to be allocated, then to skip over the
non-existing pins when initializing the allocated arrays, and then to
return the number of valid pins from sh_pfc_map_pins() instead of 0 on
success.
As we have to touch devm_kzalloc() calls anyway, use more fitting
devm_kcalloc() instead which additionally checks the array size. And since
PINMUX_TYPE_NONE is #define'd as 0, stop re-initializing already zeroed out
'pmx->configs' array.
I agree with this optimization, but I think it deserves a comment in the
source code that explicitly mentions PINMUX_TYPE_NONE, to make sure any later
rework changing the PINMUX_TYPE_NONE value would catch this.
OK, will do.
Signed-off-by: Sergei Shtylyov <[email protected]>
---
The patch is against the 'devel' branch of Linus W.'s 'linux-pinctrl.git'
repo. This patch should be applied before my R8A7794 PFC support patch and
before Laurent's patches removing non-existent GPIOs for R8A779[01],
otherwise they would cause the kernel to hang while booting!
drivers/pinctrl/sh-pfc/pinctrl.c | 32 +++++++++++++++++++-------------
1 file changed, 19 insertions(+), 13 deletions(-)
Index: linux-pinctrl/drivers/pinctrl/sh-pfc/pinctrl.c
===================================================================
--- linux-pinctrl.orig/drivers/pinctrl/sh-pfc/pinctrl.c
+++ linux-pinctrl/drivers/pinctrl/sh-pfc/pinctrl.c
@@ -571,33 +571,39 @@ static const struct pinconf_ops sh_pfc_p
/* PFC ranges -> pinctrl pin descs */
static int sh_pfc_map_pins(struct sh_pfc *pfc, struct sh_pfc_pinctrl *pmx)
{
- unsigned int i;
+ const struct sh_pfc_pin *info;
+ struct pinctrl_pin_desc *pin;
+ unsigned int i, n;
Could you please rename n to num_pins, and declare it on its own line to match
the coding style of the file ?
Will do.
+
+ /* Count the valid pins. */
+ for (i = 0, info = pfc->info->pins, n = 0;
+ i < pfc->info->nr_pins; i++, info++) {
+ if (info->enum_id || info->configs)
Why do you need to test info->configs as well ? I thought enum_id == 0 is
always reserved, am I getting it wrong ?
Look at SH_PFC_PIN_NAMED() and its users.
+ n++;
+ }
/* Allocate and initialize the pins and configs arrays. */
- pmx->pins = devm_kzalloc(pfc->dev,
- sizeof(*pmx->pins) * pfc->info->nr_pins,
- GFP_KERNEL);
+ pmx->pins = devm_kcalloc(pfc->dev, n, sizeof(*pmx->pins), GFP_KERNEL);
if (unlikely(!pmx->pins))
return -ENOMEM;
- pmx->configs = devm_kzalloc(pfc->dev,
- sizeof(*pmx->configs) * pfc->info->nr_pins,
+ pmx->configs = devm_kcalloc(pfc->dev, n, sizeof(*pmx->configs),
GFP_KERNEL);
if (unlikely(!pmx->configs))
return -ENOMEM;
- for (i = 0; i < pfc->info->nr_pins; ++i) {
- const struct sh_pfc_pin *info = &pfc->info->pins[i];
- struct sh_pfc_pin_config *cfg = &pmx->configs[i];
- struct pinctrl_pin_desc *pin = &pmx->pins[i];
+ for (i = 0, info = pfc->info->pins, pin = pmx->pins;
+ i < pfc->info->nr_pins; i++, info++) {
I would keep info as a local variable to avoid splitting the for () on
multiple lines. Same comment for the counter loop above.
I don't want to declare the same variable twice, so prefer doing gcc's
work of optimizing loop induction variable myself in this case. If you insist,
this can be changed...
[...]
@@ -622,7 +628,7 @@ int sh_pfc_register_pinctrl(struct sh_pf
pmx->pctl_desc.pmxops = &sh_pfc_pinmux_ops;
pmx->pctl_desc.confops = &sh_pfc_pinconf_ops;
pmx->pctl_desc.pins = pmx->pins;
- pmx->pctl_desc.npins = pfc->info->nr_pins;
+ pmx->pctl_desc.npins = ret;
pmx->pctl = pinctrl_register(&pmx->pctl_desc, pfc->dev, pmx);
if (pmx->pctl == NULL)
Shouldn't you also fix sh_pfc_init_ranges() ? It includes the following code
that doesn't seem to handle holes properly.
for (i = 1, nr_ranges = 1; i < pfc->info->nr_pins; ++i) {
if (pfc->info->pins[i-1].pin != pfc->info->pins[i].pin - 1)
nr_ranges++;
}
Sorry, missed it, will try to deal with this as well...
Please make sure that sh_pfc_get_pin_index() doesn't start blowing up
afterwards though.
Will do.
WBR, Sergei
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