On Fri, Jan 09, 2015 at 10:35:27PM +0300, Sergei Shtylyov wrote:
> Hello.
>
> On 01/09/2015 08:21 PM, Wolfram Sang wrote:
>
> >Let the core do the checks if HW quirks prevent a transfer. Saves code
> >from drivers and adds consistency.
>
> >Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
> >---
> > drivers/i2c/i2c-core.c | 53 ++++++++++++++++++++++++++++++++++++++++++++++++++
> > 1 file changed, 53 insertions(+)
> >
> >diff --git a/drivers/i2c/i2c-core.c b/drivers/i2c/i2c-core.c
> >index 39d25a8cb1ad..7b10a19abf5b 100644
> >--- a/drivers/i2c/i2c-core.c
> >+++ b/drivers/i2c/i2c-core.c
> >@@ -2063,6 +2063,56 @@ module_exit(i2c_exit);
> > * ----------------------------------------------------
> > */
> >
> >+/* Check if val is exceeding the quirk IFF quirk is non 0 */
> >+#define i2c_quirk_exceeded(val, quirk) ((quirk) && ((val) > (quirk)))
> >+
> >+static int i2c_quirk_error(struct i2c_adapter *adap, struct i2c_msg *msg, char *err_msg)
> >+{
> >+ dev_err(&adap->dev, "quirk: %s (addr 0x%04x, size %u)\n", err_msg, msg->addr, msg->len);
> >+ return -EOPNOTSUPP;
> >+}
>
> Always returning the same value doesn't make much sense. Are you trying
> to save space on the call sites?
Please elaborate. I think it does. If a quirk matches, we report that we
don't support this transfer.
> [...]
> >@@ -2080,6 +2130,9 @@ int __i2c_transfer(struct i2c_adapter *adap, struct i2c_msg *msgs, int num)
> > unsigned long orig_jiffies;
> > int ret, try;
> >
> >+ if (adap->quirks && i2c_check_for_quirks(adap, msgs, num))
>
> So, you only check for non-zero result of this function? Perhaps it makes
> sense to return true/false instead?
Could be done, but what would be the advantage? A lot of functions
return errno or 0.
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