Messages in this thread Patch in this message | | | From | Yangtao Li <> | Subject | [PATCH v3 3/5] thermal/drivers/brcmstb_thermal: convert to use devm_request_threaded_irq_emsg() | Date | Mon, 3 Jul 2023 17:04:52 +0800 |
| |
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.
And tglx point out that:
If we actually look at the call sites of devm_request_threaded_irq() then the vast majority of them print more or less lousy error messages. A quick grep/sed/awk/sort/uniq revealed
519 messages total (there are probably more)
352 unique messages
323 unique messages after lower casing
Those 323 are mostly just variants of the same patterns with slight modifications in formatting and information provided.
186 of these messages do not deliver any useful information, e.g. "no irq", "
The most useful one of all is: "could request wakeup irq: %d"
So there is certainly an argument to be made that this particular function should print a well formatted and informative error message.
It's not a general allocator like kmalloc(). It's specialized and in the vast majority of cases failing to request the interrupt causes the device probe to fail. So having proper and consistent information why the device cannot be used _is_ useful.
Let's use devm_request_threaded_irq_emsg(), which ensure that all error handling branches print error information. In this way, when this function fails, the upper-layer functions can directly return an error code without missing debugging information. Otherwise, the error message will be printed redundantly or missing.
Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Yangtao Li <frank.li@vivo.com> --- drivers/thermal/broadcom/brcmstb_thermal.c | 12 +++++------- 1 file changed, 5 insertions(+), 7 deletions(-)
diff --git a/drivers/thermal/broadcom/brcmstb_thermal.c b/drivers/thermal/broadcom/brcmstb_thermal.c index 72d1dbe60b8f..b922f8278f62 100644 --- a/drivers/thermal/broadcom/brcmstb_thermal.c +++ b/drivers/thermal/broadcom/brcmstb_thermal.c @@ -349,14 +349,12 @@ static int brcmstb_thermal_probe(struct platform_device *pdev) irq = platform_get_irq_optional(pdev, 0); if (irq >= 0) { - ret = devm_request_threaded_irq(&pdev->dev, irq, NULL, - brcmstb_tmon_irq_thread, - IRQF_ONESHOT, - DRV_NAME, priv); - if (ret < 0) { - dev_err(&pdev->dev, "could not request IRQ: %d\n", ret); + ret = devm_request_threaded_irq_emsg(&pdev->dev, irq, NULL, + brcmstb_tmon_irq_thread, + IRQF_ONESHOT, + DRV_NAME, priv, NULL); + if (ret < 0) return ret; - } } dev_info(&pdev->dev, "registered AVS TMON of-sensor driver\n"); -- 2.39.0
| |