From: Russell Currey <ruscur@xxxxxxxxxx> commit 298360af3dab45659810fdc51aba0c9f4097e4f6 upstream. ast_get_dram_info() configures a window in order to access BMC memory. A BMC register can be configured to disallow this, and if so, causes an infinite loop in the ast driver which renders the system unusable. Fix this by erroring out if an error is detected. On powerpc systems with EEH, this leads to the device being fenced and the system continuing to operate. Signed-off-by: Russell Currey <ruscur@xxxxxxxxxx> Reviewed-by: Joel Stanley <joel@xxxxxxxxx> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx> Link: http://patchwork.freedesktop.org/patch/msgid/20161215051241.20815-1-ruscur@xxxxxxxxxx Signed-off-by: Jiri Slaby <jslaby@xxxxxxx> Signed-off-by: Willy Tarreau <w@xxxxxx> --- drivers/gpu/drm/ast/ast_main.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c index 6283432..4e7c97a 100644 --- a/drivers/gpu/drm/ast/ast_main.c +++ b/drivers/gpu/drm/ast/ast_main.c @@ -120,7 +120,8 @@ static int ast_get_dram_info(struct drm_device *dev) ast_write32(ast, 0x10000, 0xfc600309); do { - ; + if (pci_channel_offline(dev->pdev)) + return -EIO; } while (ast_read32(ast, 0x10000) != 0x01); data = ast_read32(ast, 0x10004); @@ -343,7 +344,9 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags) ast_detect_chip(dev); if (ast->chip != AST1180) { - ast_get_dram_info(dev); + ret = ast_get_dram_info(dev); + if (ret) + goto out_free; ast->vram_size = ast_get_vram_info(dev); DRM_INFO("dram %d %d %d %08x\n", ast->mclk, ast->dram_type, ast->dram_bus_width, ast->vram_size); } -- 2.8.0.rc2.1.gbe9624a