On 04/23/2015 05:29 PM, Jia-Ju Bai wrote:
Thank you!
On 04/23/2015 05:19 PM, Sergei Shtylyov wrote:
Hello.
On 4/23/2015 9:45 AM, Jia-Ju Bai wrote:
Dear Sir,
I am very sorry to trouble you.
I find that resource management is error-prone when writing Linux
drivers, and
many problems may occur, such as resource leaks.
Meanwhile, I find that many applied patches in the kernel mailing
list focus
on releasing allocated resources, especially in error-handling paths.
Therefore, I have a question: is it possible to automatically release
allocated resources in drivers before unloading and in
error-handling paths?
Yes, there's managed device API, look for functions starting with
devm_.
There's one limitation though: it can be used only in the driver's
probe() method, so can't be used when e.g. network device is being
opened.
I think many APIs, such as kmalloc, can also be managed like garbage
collection in Java.
Maybe the performance is a matter.
I am looking forward to your reply, thanks!
Such questions should actually be asked on the mailing lists, not
personally.
I am sorry for that, and I will cc to the mailing lists and other
maintainers.
I find that some common APIs are not managed, such as napi_enable and
napi_start_queue. Is it possible to provide managed APIs for them?
I also find many drivers do not use these managed APIs, especially in
ethernet card drivers (like e100, r8169). Is it possible to change them?
Best wishes,
Jia-Ju Bai
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