diff options
| author | Hans de Goede <hdegoede@redhat.com> | 2012-01-10 20:02:04 (GMT) |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-01-16 13:27:58 (GMT) |
| commit | 24be689bfbbcd6c047d7918784ff810e97648006 (patch) | |
| tree | b682e75ed5ccd2124d5d44cf528707562c5a6f00 /drivers/media/video/pwc/pwc-if.c | |
| parent | 1c852201a28601b1379857f615e99071211294c6 (diff) | |
| download | linux-fsl-qoriq-24be689bfbbcd6c047d7918784ff810e97648006.tar.xz | |
[media] pwc: Use one shared usb command buffer
The pwc driver used to:
1. kmalloc a buffer
2. memcpy data to send over usb there
3. do the usb_control_msg call (which does not work with data on the stack)
4. free the buffer
For every usb command send. This patch changes the code to instead malloc
a buffer for this purpose once and use it everywhere.
[mchehab@redhat.com: Fix a compilation breakage with allyesconfig:
drivers/media/video/pwc/pwc-ctrl.c: In function ‘pwc_get_cmos_sensor’:
drivers/media/video/pwc/pwc-ctrl.c:546:3: warning: passing argument 4 of ‘recv_control_msg’ makes integer from pointer without a cast [en$
drivers/media/video/pwc/pwc-ctrl.c:107:12: note: expected ‘int’ but argument is of type ‘unsigned char *’
drivers/media/video/pwc/pwc-ctrl.c:546:3: error: too many arguments to function ‘recv_control_msg’
drivers/media/video/pwc/pwc-ctrl.c:107:12: note: declared here]
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/video/pwc/pwc-if.c')
| -rw-r--r-- | drivers/media/video/pwc/pwc-if.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/media/video/pwc/pwc-if.c b/drivers/media/video/pwc/pwc-if.c index 23eacee..a07df4e 100644 --- a/drivers/media/video/pwc/pwc-if.c +++ b/drivers/media/video/pwc/pwc-if.c @@ -605,6 +605,7 @@ static void pwc_video_release(struct v4l2_device *v) v4l2_ctrl_handler_free(&pdev->ctrl_handler); + kfree(pdev->ctrl_buf); kfree(pdev); } @@ -1115,6 +1116,14 @@ static int usb_pwc_probe(struct usb_interface *intf, const struct usb_device_id if (hint < MAX_DEV_HINTS) device_hint[hint].pdev = pdev; + /* Allocate USB command buffers */ + pdev->ctrl_buf = kmalloc(sizeof(pdev->cmd_buf), GFP_KERNEL); + if (!pdev->ctrl_buf) { + PWC_ERROR("Oops, could not allocate memory for pwc_device.\n"); + rc = -ENOMEM; + goto err_free_mem; + } + #ifdef CONFIG_USB_PWC_DEBUG /* Query sensor type */ if (pwc_get_cmos_sensor(pdev, &rc) >= 0) { @@ -1199,6 +1208,7 @@ err_free_controls: err_free_mem: if (hint < MAX_DEV_HINTS) device_hint[hint].pdev = NULL; + kfree(pdev->ctrl_buf); kfree(pdev); return rc; } |