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greybus: es2: Don't use stack memory as USB request data

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USB request data must be DMAble memory, allocate it with kzalloc()
instead of declaring it as a local variable.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Laurent Pinchart 2015-12-22 03:00:37 +02:00 committed by Greg Kroah-Hartman
parent e715a54f4b
commit ccb5803591
1 changed files with 14 additions and 17 deletions
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31
drivers/staging/greybus/es2.c
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@ -223,36 +223,33 @@ static int unmap_cport(struct es2_ap_dev *es2, u16 cport_id)
int es2_ap_csi_setup(struct gb_host_device *hd, bool start,
struct es2_ap_csi_config *cfg)
{
struct es2_ap_csi_config_request cfg_req;
struct es2_ap_csi_config_request *cfg_req;
struct es2_ap_dev *es2 = hd_to_es2(hd);
struct usb_device *udev = es2->usb_dev;
int retval;
cfg_req.csi_id = cfg->csi_id;
cfg_req = kzalloc(sizeof(*cfg_req), GFP_KERNEL);
if (!cfg_req)
return -ENOMEM;
cfg_req->csi_id = cfg->csi_id;
if (start) {
cfg_req.clock_mode = cfg->clock_mode;
cfg_req.num_lanes = cfg->num_lanes;
cfg_req.padding = 0;
cfg_req.bus_freq = cpu_to_le32(cfg->bus_freq);
} else {
cfg_req.clock_mode = 0;
cfg_req.num_lanes = 0;
cfg_req.padding = 0;
cfg_req.bus_freq = 0;
cfg_req->clock_mode = cfg->clock_mode;
cfg_req->num_lanes = cfg->num_lanes;
cfg_req->bus_freq = cpu_to_le32(cfg->bus_freq);
}
retval = usb_control_msg(udev, usb_sndctrlpipe(udev, 0),
REQUEST_CSI_TX_CONTROL,
USB_DIR_OUT | USB_TYPE_VENDOR |
USB_RECIP_INTERFACE, 0, 0, &cfg_req,
sizeof(cfg_req), ES2_TIMEOUT);
if (retval < 0) {
USB_RECIP_INTERFACE, 0, 0, cfg_req,
sizeof(*cfg_req), ES2_TIMEOUT);
if (retval < 0)
dev_err(&udev->dev, "failed to setup csi: %d\n", retval);
return retval;
}
return 0;
kfree(cfg_req);
return retval;
}
EXPORT_SYMBOL_GPL(es2_ap_csi_setup);