c7f800ec97
usb_write_port_complete() in usb_ops_linux.c is a completion handler function for the USB driver. So it should not sleep, but it is can sleep according to the function call paths (from bottom to top) in Linux-4.16: [FUNC] kzalloc(GFP_KERNEL) drivers/staging/rtl8188eu/core/rtw_cmd.c, 1081: kzalloc in rtw_chk_hi_queue_cmd drivers/staging/rtl8188eu/os_dep/usb_ops_linux.c, 604: rtw_chk_hi_queue_cmd in usb_write_port_complete [FUNC] kzalloc(GFP_KERNEL) drivers/staging/rtl8188eu/core/rtw_cmd.c, 1075: kzalloc in rtw_chk_hi_queue_cmd drivers/staging/rtl8188eu/os_dep/usb_ops_linux.c, 604: rtw_chk_hi_queue_cmd in usb_write_port_complete To fix these bugs, GFP_KERNEL is replaced with GFP_ATOMIC. These bugs are found by my static analysis tool DSAC. Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.