Re: [PATCH v3 1/5] genirq/devres: Add devm_request_threaded_irq_emsg()
From: AngeloGioacchino Del Regno
Date: Wed Jul 05 2023 - 06:14:31 EST
Il 05/07/23 09:43, Yangtao Li ha scritto:
On 2023/7/5 15:30, Uwe Kleine-König wrote:
Hello,
On Wed, Jul 05, 2023 at 10:15:37AM +0800, Jonathan Cameron wrote:
On Tue, 4 Jul 2023 16:19:54 +0200
Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx> wrote:
Hello,
On Tue, Jul 04, 2023 at 05:06:12PM +0800, Yangtao Li wrote:
On 2023/7/4 16:48, Krzysztof Kozlowski wrote:
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On 03/07/2023 19:43, Uwe Kleine-König wrote:
Hello Krzysztof,
On Mon, Jul 03, 2023 at 02:31:59PM +0200, Krzysztof Kozlowski wrote:
On 03/07/2023 11:04, Yangtao Li wrote:
There are more than 700 calls to the devm_request_threaded_irq method.
Most drivers only request one interrupt resource, and these error
messages are basically the same. If error messages are printed
everywhere, more than 1000 lines of code can be saved by removing the
msg in the driver.
...
+int devm_request_threaded_irq_emsg(struct device *dev, unsigned int irq,
+ irq_handler_t handler, irq_handler_t
thread_fn,
+ unsigned long irqflags, const char *devname,
+ void *dev_id, const char *emsg)
+{
+ int rc;
+
+ rc = devm_request_threaded_irq(dev, irq, handler, NULL, irqflags,
+ devname, dev_id);
+ if (rc && rc != -EPROBE_DEFER) {
+ dev_err(dev, "Failed to request %sinterrupt %u %s %s: %pe\n",
+ thread_fn ? "threaded " : "", irq, devname ? :
dev_name(dev),
+ emsg ? : "", ERR_PTR(rc));
It is open-coding dev_err_probe(). Just use dev_err_probe instead.
dev_err_probe is supposed to be only called in probe functions, while
devm_request_threaded_irq might be called in other contexts (e.g. when a
device is opened). That's why I asked to not use dev_err_probe() in v2
True, but then all the callers of this function will forget to set
deferred probe reason.
That's another reason for letting the driver issue the error message and
not the request_irq function.
So let's use dev_err_probe?
BTW, any suggestions for names here, keep using
devm_request_threaded_irq_emsg or change to a new name?
I would have called it devm_request_threaded_irq_verbose() which I
consider easier to understand. But maybe is just my (green)
bikeshed.
If going to use dev_err_probe() internally maybe can just use
devm_request_threaded_irq_probe() thus reflecting that and making
it different to the devm_request_threaded_irq()?
I like devm_request_threaded_irq_probe(), thanks for that suggestion
(even though it's red :-)
devm_request_threaded_irq_probe() also sounds good to me, :-) If there is no
objection, I think it's time to start working on switching the api.
+1 on devm_request_threaded_irq_probe() name, makes sense to me, as it'd be
using the same error logic as dev_err_probe() (no prints if -EPROBE_DEFER),
and also.. this is a function that's anyway used in .probe() callbacks at
least in the *vast* majority of the cases.
Cheers,
Angelo
int devm_request_threaded_irq_probe(struct device *dev, unsigned int irq,
irq_handler_t handler, irq_handler_t thread_fn, unsigned long irqflags, const char
*devname, void *dev_id, const char *info) { int rc; rc =
devm_request_threaded_irq(dev, irq, handler, NULL, irqflags, devname, dev_id); if
(rc) return dev_err_probe(dev, rc, "Failed to request %sinterrupt %u %s %s\n",
thread_fn ? "threaded " : "", irq, devname ? : dev_name(dev), info ? : ""); return
0; } EXPORT_SYMBOL(devm_request_threaded_irq_probe); MBR, Yangtao
Best regards
Uwe