Messages in this thread | | | From | Bartosz Golaszewski <> | Date | Wed, 18 Jan 2023 16:07:11 +0100 | Subject | Re: [PATCH v2 2/2] i2c: dev: don't allow user-space to deadlock the kernel |
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On Wed, Jan 18, 2023 at 3:59 PM Hillf Danton <hdanton@sina.com> wrote: > > On Thu, 29 Dec 2022 17:00:45 +0100 Bartosz Golaszewski <bartosz.golaszewski@linaro.org> > > > > @@ -44,8 +45,14 @@ struct i2c_dev { > > struct i2c_adapter *adap; > > struct device dev; > > struct cdev cdev; > > + struct rw_semaphore sem; > > int state; > #define STATE_RELEASED 1 > #define STATE_DETACHED 2 > > }; > > Because syscalls like read, write and ioctl have completed upon release, > serializing the release and detach pathes is a cure to the issue. >
Please elaborate because I have no idea what you mean by that.
Bart
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