The driver calls ioremap() on the HGA video memory at 0xb0000 without first reserving the physical address range. This leaves the kernel resource tree incomplete and can cause silent conflicts with other drivers claiming the same range.
Add a devm_request_mem_region() call before ioremap() in hga_card_detect() to reserve the memory region. Signed-off-by: Hardik Phalet <[email protected]> --- Changes in v3: - Used dev_err() to log memory region request, based on another review comment by Thomas [2]. Changes in v2: - Used devm_request_mem_region instead of request_mem_region, based on a review comment by Thomas [1]. v1: https://lore.kernel.org/all/[email protected]/ v2: https://lore.kernel.org/all/[email protected]/ [1]: https://lore.kernel.org/all/[email protected]/ [2]: https://lore.kernel.org/all/[email protected]/ drivers/video/fbdev/hgafb.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/video/fbdev/hgafb.c b/drivers/video/fbdev/hgafb.c index 14418aa3791a..d32fd1c5217c 100644 --- a/drivers/video/fbdev/hgafb.c +++ b/drivers/video/fbdev/hgafb.c @@ -276,7 +276,7 @@ static void hga_blank(int blank_mode) spin_unlock_irqrestore(&hga_reg_lock, flags); } -static int hga_card_detect(void) +static int hga_card_detect(struct platform_device *pdev) { int count = 0; void __iomem *p, *q; @@ -284,6 +284,11 @@ static int hga_card_detect(void) hga_vram_len = 0x08000; + if (!devm_request_mem_region(&pdev->dev, 0xb0000, hga_vram_len, "hgafb")) { + dev_err(&pdev->dev, "cannot reserve video memory at 0xb0000\n"); + return -EBUSY; + } + hga_vram = ioremap(0xb0000, hga_vram_len); if (!hga_vram) return -ENOMEM; @@ -568,7 +573,7 @@ static int hgafb_probe(struct platform_device *pdev) struct fb_info *info; int ret; - ret = hga_card_detect(); + ret = hga_card_detect(pdev); if (ret) return ret; -- 2.53.0
