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92541dd9dd
rf_lock is used to protect RF register access, but they will not called from interrupt context, so *_irqsave version isn't necessary. Then, these delays don't affect IRQ services. The old code holds spin_lock_irqsave() that will be detected a long delay as below: kworker/-276 4d... 0us : _raw_spin_lock_irqsave kworker/-276 4d... 0us : rtl8723_phy_rf_serial_read <-rtl8723de_phy_set_rf_reg kworker/-276 4d... 1us : rtl8723_phy_query_bb_reg <-rtl8723_phy_rf_serial_read kworker/-276 4d... 3us : rtl8723_phy_set_bb_reg <-rtl8723_phy_rf_serial_read kworker/-276 4d... 4us : __const_udelay <-rtl8723_phy_rf_serial_read kworker/-276 4d... 4us!: delay_mwaitx <-rtl8723_phy_rf_serial_read kworker/-276 4d... 1004us : rtl8723_phy_set_bb_reg <-rtl8723_phy_rf_serial_read [...] Reported-by: Lucas Stach <dev@lynxeye.de> Signed-off-by: Ping-Ke Shih <pkshih@realtek.com> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.