[balbi-usb:merge-result-for-greg 66/99] drivers/usb/core/hub.c:2654 usb_get_hub_port_power_state() error: doing dma on the stack ((null))
Hi Felipe,
FYI, there are new smatch warnings show up in
tree: git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git
merge-result-for-greg
head: 23953bde3e4d6aa8780dc054f6ad9882ac63f4f4
commit: e918fa161f510136fce45a524e934fe20e62c8b1 [66/99] Merge tag
'gadget-for-v3.7' into merge-result-for-greg
drivers/usb/core/hub.c:2654 usb_get_hub_port_power_state() error: doing dma on
the stack ((null))
drivers/usb/core/hub.c:4733 store_port_power_control() info: why not propagate
'ret' from set_port_feature() instead of -5?
drivers/usb/core/hub.c:4744 store_port_power_control() info: why not propagate
'ret' from clear_port_feature() instead of -5?
vim +2654 drivers/usb/core/hub.c
2644 return ret;
2645 }
2646
2647 static int usb_get_hub_port_power_state(struct usb_device *hdev, int
port1)
2648 {
2649 struct usb_hub *hub = hdev_to_hub(hdev);
2650 struct usb_port_status data;
2651 u16 portstatus;
2652 int ret;
2653
2654 ret = get_port_status(hub-hdev, port1, data);
2655 if (ret 4) {
2656 dev_err(hub-intfdev,
2657 %s failed (err = %d)\n, __func__, ret);
2658 if (ret = 0)
2659 ret = -EIO;
2660 return ret;
2661 } else
2662 portstatus = le16_to_cpu(data.wPortStatus);
2663 return port_is_power_on(hub, portstatus);
2664 }
---
0-DAY kernel build testing backend Open Source Technology Centre
Fengguang Wu w...@linux.intel.com Intel Corporation
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Re: [balbi-usb:merge-result-for-greg 66/99] drivers/usb/core/hub.c:2654 usb_get_hub_port_power_state() error: doing dma on the stack ((null))
On Wed, Sep 12, 2012 at 04:26:22PM +0800, Fengguang Wu wrote: Hi Felipe, FYI, there are new smatch warnings show up in tree: git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git merge-result-for-greg head: 23953bde3e4d6aa8780dc054f6ad9882ac63f4f4 commit: e918fa161f510136fce45a524e934fe20e62c8b1 [66/99] Merge tag 'gadget-for-v3.7' into merge-result-for-greg drivers/usb/core/hub.c:2654 usb_get_hub_port_power_state() error: doing dma on the stack ((null)) Smatch prints out a lot of these warnings. I haven't looked at the rules in a while, so maybe there is a bounce buffer somewhere where it detects stack memory and allocates a DMA'able buffer? It would be better if the function documentation for usb_control_msg() said that the *data pointer had to be kmalloc()ed. Also I wonder if Documentation/DMA-API-HOWTO.txt is out of data. Are we allowed to DMA to vmalloc()ed memory yet? regards, dan carpenter -- To unsubscribe from this list: send the line unsubscribe linux-omap in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: [balbi-usb:merge-result-for-greg 66/99] drivers/usb/core/hub.c:2654 usb_get_hub_port_power_state() error: doing dma on the stack ((null))
Hi, On Wed, Sep 12, 2012 at 11:50:57AM +0300, Dan Carpenter wrote: On Wed, Sep 12, 2012 at 04:26:22PM +0800, Fengguang Wu wrote: Hi Felipe, FYI, there are new smatch warnings show up in tree: git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git merge-result-for-greg head: 23953bde3e4d6aa8780dc054f6ad9882ac63f4f4 commit: e918fa161f510136fce45a524e934fe20e62c8b1 [66/99] Merge tag 'gadget-for-v3.7' into merge-result-for-greg drivers/usb/core/hub.c:2654 usb_get_hub_port_power_state() error: doing dma on the stack ((null)) that's not part of what I handle :-( And merge-result-for-greg was really a temporary branch, btw :-) -- balbi signature.asc Description: Digital signature
Re: [balbi-usb:merge-result-for-greg 66/99] drivers/usb/core/hub.c:2654 usb_get_hub_port_power_state() error: doing dma on the stack ((null))
On Wed, Sep 12, 2012 at 03:02:13PM +0300, Felipe Balbi wrote: Hi, On Wed, Sep 12, 2012 at 11:50:57AM +0300, Dan Carpenter wrote: On Wed, Sep 12, 2012 at 04:26:22PM +0800, Fengguang Wu wrote: Hi Felipe, FYI, there are new smatch warnings show up in tree: git://git.kernel.org/pub/scm/linux/kernel/git/balbi/usb.git merge-result-for-greg head: 23953bde3e4d6aa8780dc054f6ad9882ac63f4f4 commit: e918fa161f510136fce45a524e934fe20e62c8b1 [66/99] Merge tag 'gadget-for-v3.7' into merge-result-for-greg drivers/usb/core/hub.c:2654 usb_get_hub_port_power_state() error: doing dma on the stack ((null)) that's not part of what I handle :-( And merge-result-for-greg was really a temporary branch, btw :-) No problem. I'll stop testing this branch :) Thanks, Fengguang -- To unsubscribe from this list: send the line unsubscribe linux-omap in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
