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- C 98.2%
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a1bbc2660e
As a part of driver load, a device file /dev/wlan is created to provide control to the userspace to turn ON and OFF the wifi. This file also acts as a holding-the-context entity for the userspace till the host driver and firmware are properly up and ready as a part of driver probe. In a scenario where driver probe fails, there can be an occurrence of a race condition wherein the driver gets unloaded in the probe error path before the userspace releases the control of the /dev/wlan file. This leads to a NULL pointer access as the file memory gets deleted as part of driver unload. To achieve a serialization between the userspace context, where file is being accessed, and the driver context, where unload is being done, implement a simple reference counting through which the driver unload waits till userspace cleanly releases access to the file. Change-Id: I3dc214397c53b76111da33dc0ae6db296fc98cb4 CRs-Fixed: 2660321 |
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This is CNSS WLAN Host Driver for products starting from iHelium