On Tue, Nov 28, 2023 at 3:52 PM Bartosz Golaszewski <brgl@xxxxxxxx> wrote: > We don't need to lock the GPIO device or chip separately - the > descriptor structs will stay alive as long as there's a live reference > to the GPIO device. GPIO device will have an SRCU cookie for > protecting API calls against removal of the chip. > > To summarize: one mutex for the GPIO device list, one lock per GPIO > descriptor and SRCU protection of the GPIO device's chip. > > Does it make sense? Absolutely, standing by to review, it's gonna look awesome! Linus
Re: [PATCH 2/2] gpio: use a mutex to protect the list of GPIO devices
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- Subject: Re: [PATCH 2/2] gpio: use a mutex to protect the list of GPIO devices
- From: Linus Walleij <linus.walleij@xxxxxxxxxx>
- Date: Tue, 28 Nov 2023 16:05:54 +0100
- In-reply-to: <CAMRc=MdSO_Zp2wqyZQvqadDoUdZVi09vE2fo3oZF3161W-+Qhw@mail.gmail.com>
- References: <20231127193716.63143-1-brgl@bgdev.pl> <20231127193716.63143-2-brgl@bgdev.pl> <CACRpkdYG5FbOLDLM+WGEbX-42mjkALU-HfAgdLLhHSq+K1gnaw@mail.gmail.com> <CAMRc=MdSO_Zp2wqyZQvqadDoUdZVi09vE2fo3oZF3161W-+Qhw@mail.gmail.com>
- References:
- [PATCH 1/2] gpio: sysfs: fix forward declaration of struct gpio_device
- From: Bartosz Golaszewski
- [PATCH 2/2] gpio: use a mutex to protect the list of GPIO devices
- From: Bartosz Golaszewski
- Re: [PATCH 2/2] gpio: use a mutex to protect the list of GPIO devices
- From: Linus Walleij
- Re: [PATCH 2/2] gpio: use a mutex to protect the list of GPIO devices
- From: Bartosz Golaszewski
- [PATCH 1/2] gpio: sysfs: fix forward declaration of struct gpio_device
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