diff options
| author | Russell Currey <[email protected]> | 2016-12-15 16:12:41 +1100 |
|---|---|---|
| committer | Daniel Vetter <[email protected]> | 2016-12-18 14:39:50 +0100 |
| commit | 298360af3dab45659810fdc51aba0c9f4097e4f6 (patch) | |
| tree | 98d46be4e77202f57ab7f36e4b245d484fa11025 | |
| parent | 2cf026ae85c42f253feb9f420d1b4bc99bd5503d (diff) | |
drivers/gpu/drm/ast: Fix infinite loop if read fails
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.
Cc: <[email protected]> # 3.10+
Signed-off-by: Russell Currey <[email protected]>
Reviewed-by: Joel Stanley <[email protected]>
Signed-off-by: Daniel Vetter <[email protected]>
Link: http://patchwork.freedesktop.org/patch/msgid/[email protected]
| -rw-r--r-- | drivers/gpu/drm/ast/ast_main.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/gpu/drm/ast/ast_main.c b/drivers/gpu/drm/ast/ast_main.c index 904beaa932d0..f75c6421db62 100644 --- a/drivers/gpu/drm/ast/ast_main.c +++ b/drivers/gpu/drm/ast/ast_main.c @@ -223,7 +223,8 @@ 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); @@ -428,7 +429,9 @@ int ast_driver_load(struct drm_device *dev, unsigned long flags) ast_detect_chip(dev, &need_post); 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); } |