[PATCH 0/3] fbdev: Request memory regions in platform drivers

[Amit Barzilai <amit.barzilai22@gmail.com>]

Several fbdev platform drivers call ioremap() on their hardware MMIO
without first claiming the range via request_mem_region(). This leaves
the kernel resource tree (/proc/iomem) with no record of the mapping,
allowing another driver to silently map the same registers.

This series fixes three platform_device drivers by switching to helpers
that combine resource claiming and ioremap in a single managed call.
cobalt_lcdfb and clps711x-fb are converted to
devm_platform_get_and_ioremap_resource(); goldfishfb is converted to
devm_ioremap_resource(), which also lets us drop the manual iounmap()
calls from the error path and remove function.

For clps711x-fb, resource 1 (the framebuffer range) already used
devm_platform_get_and_ioremap_resource() correctly; this series makes
resource 0 (the MMIO control registers) consistent with it.

This is part of the ongoing effort described in
Documentation/drm/todo.rst ("Request memory regions in all fbdev
drivers").

Amit Barzilai (3):
  fbdev: cobalt_lcdfb: Request memory region
  fbdev: clps711x-fb: Request memory region for MMIO
  fbdev: goldfishfb: Request memory region

 drivers/video/fbdev/clps711x-fb.c  |  9 +++------
 drivers/video/fbdev/cobalt_lcdfb.c | 12 +++---------
 drivers/video/fbdev/goldfishfb.c   |  8 +++-----
 3 files changed, 9 insertions(+), 20 deletions(-)


base-commit: 3f9357c30a44734d45e3093c521d52b2aefb09f5
-- 
2.53.0