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[v1,0/4] Fixes for the mcp2221 HID-to-I2C-bridge driver

Message ID 20220830180215.31099-1-Enrik.Berkhan@inka.de
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Series Fixes for the mcp2221 HID-to-I2C-bridge driver | expand

Message

Enrik Berkhan Aug. 30, 2022, 6:02 p.m. UTC 
In this patch series are fixes for issues I found during recent tests of
an MCP2221 board.

- you can confuse the kernel driver when using the chip from user mode
  via /dev/hidrawX, typically leading to a NULL pointer dereference in
  the driver's HID raw event handler

- the driver needs > 15s to initialize because the HID raw handling is
  not enabled during initialization of the GPIO part

- data shared with the bottom half code is not protected from concurrent
  access

- the rxbuf pointer can become invalid or even stale if the device would
  send unsolicited reports

Enrik Berkhan (4):
  HID: mcp2221: don't connect hidraw
  HID: mcp2221: enable HID I/O during GPIO probe
  HID: mcp2221: protect shared data with spin lock
  HID: mcp2221: avoid stale rxbuf pointer

 drivers/hid/hid-mcp2221.c | 114 ++++++++++++++++++++++++++++++++------
 1 file changed, 97 insertions(+), 17 deletions(-)