Hello,
On Tue, Jun 27, 2023 at 06:12:01PM +0800, Yangtao Li wrote:
> 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.
>
> 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.
>
> Signed-off-by: Yangtao Li <frank.li@xxxxxxxx>
> ---
> kernel/irq/devres.c | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c
> index f6e5515ee077..fcb946ffb7ec 100644
> --- a/kernel/irq/devres.c
> +++ b/kernel/irq/devres.c
> @@ -58,8 +58,10 @@ int devm_request_threaded_irq(struct device *dev, unsigned int irq,
>
> dr = devres_alloc(devm_irq_release, sizeof(struct irq_devres),
> GFP_KERNEL);
> - if (!dr)
> + if (!dr) {
> + dev_err(dev, "Failed to allocate device resource data\n");
> return -ENOMEM;
> + }
>
> if (!devname)
> devname = dev_name(dev);
> @@ -67,6 +69,7 @@ int devm_request_threaded_irq(struct device *dev, unsigned int irq,
> rc = request_threaded_irq(irq, handler, thread_fn, irqflags, devname,
> dev_id);
> if (rc) {
> + dev_err_probe(dev, rc, "Failed to request threaded irq%d: %d\n", irq, rc);
This changes semantics because dev_err_probe() is only supposed to be
called in probe functions. Not sure about devm_request_threaded_irq, but
its friend request_irq is called in the setup_irq (or open IIRC)
callback of serial drivers.
While I assume changing to dev_err_probe is a result of my concern that
no error should be printed when rc=-EPROBEDEFER, my other concern that
adding an error message to a generic allocation function is a bad idea
still stands.
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
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