On Tue, Jul 7, 2020 at 5:03 PM Sungbo Eo <man...@gorani.run> wrote: > On 20. 7. 6. 오후 9:00, Andy Shevchenko wrote:
... > But I don't really understand what mutex does here. The driver does not > need consecutive commands, it only sends/receives only one byte at a > time. And AFAIK each i2c_smbus function is already protected by a mutex. > So what should be exactly inside the lock? Should we protect the output > buffer as well? I'm not an expert on this so please enlighten me. There are questions, answering them will give you a solution: - Since we have two functions doing i2c communications, can they clash? If so, does the i2c framework guarantee the serialisation? - Since we have a shared resource (buf), can accessors clash? How do we guarantee serialization? -- With Best Regards, Andy Shevchenko
