[media] pwc: Get rid of error_status and unplugged variables

Having 2 ways of tracking disconnection is too much, remove both and
instead simply set pdev->udev to NULL on disconnect. Also check for
pdev->udev being NULL in all possible entry paths.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

3 files changed, 41 insertions, 23 deletions

diff --git a/drivers/media/video/pwc/pwc-if.c b/drivers/media/video/pwc/pwc-if.c
index 907db23fdb5d..6bff33b357b9 100644
--- a/drivers/media/video/pwc/pwc-if.c
+++ b/drivers/media/video/pwc/pwc-if.c
@@ -570,14 +570,7 @@ static void pwc_isoc_cleanup(struct pwc_device *pdev)
 
         pwc_iso_stop(pdev);
         pwc_iso_free(pdev);
-
-        /* Stop camera, but only if we are sure the camera is still there (unplug
-           is signalled by EPIPE)
-         */
-        if (pdev->error_status != EPIPE) {
-                PWC_DEBUG_OPEN("Setting alternate interface 0.\n");
-                usb_set_interface(pdev->udev, 0, 0);
-        }
+        usb_set_interface(pdev->udev, 0, 0);
 
         pdev->iso_init = 0;
         PWC_DEBUG_OPEN("<< pwc_isoc_cleanup()\n");
@@ -719,6 +712,9 @@ static int pwc_video_open(struct file *file)
         PWC_DEBUG_OPEN(">> video_open called(vdev = 0x%p).\n", vdev);
 
         pdev = video_get_drvdata(vdev);
+        if (!pdev->udev)
+                return -ENODEV;
+
         if (pdev->vopen) {
                 PWC_DEBUG_OPEN("I'm busy, someone is using the device.\n");
                 return -EBUSY;
@@ -760,7 +756,6 @@ static int pwc_video_open(struct file *file)
 
         /* Reset buffers & parameters */
         pdev->visoc_errors = 0;
-        pdev->error_status = 0;
         pwc_construct(pdev); /* set min/max sizes correct */
 
         /* Set some defaults */
@@ -837,7 +832,7 @@ static int pwc_video_close(struct file *file)
         pwc_free_buffers(pdev);
 
         /* Turn off LEDS and power down camera, but only when not unplugged */
-        if (!pdev->unplugged) {
+        if (pdev->udev) {
                 /* Turn LEDs off */
                 if (pwc_set_leds(pdev, 0, 0) < 0)
                         PWC_DEBUG_MODULE("Failed to set LED on/off time.\n");
@@ -859,8 +854,8 @@ static ssize_t pwc_video_read(struct file *file, char __user *buf,
         struct video_device *vdev = file->private_data;
         struct pwc_device *pdev = video_get_drvdata(vdev);
 
-        if (pdev->error_status)
-                return -pdev->error_status;
+        if (!pdev->udev)
+                return -ENODEV;
 
         return vb2_read(&pdev->vb_queue, buf, count, ppos,
                         file->f_flags & O_NONBLOCK);
@@ -871,7 +866,7 @@ static unsigned int pwc_video_poll(struct file *file, poll_table *wait)
         struct video_device *vdev = file->private_data;
         struct pwc_device *pdev = video_get_drvdata(vdev);
 
-        if (pdev->error_status)
+        if (!pdev->udev)
                 return POLL_ERR;
 
         return vb2_poll(&pdev->vb_queue, file, wait);
@@ -923,8 +918,8 @@ static int buffer_prepare(struct vb2_buffer *vb)
         struct pwc_device *pdev = vb2_get_drv_priv(vb->vb2_queue);
 
         /* Don't allow queing new buffers after device disconnection */
-        if (pdev->error_status)
-                return -pdev->error_status;
+        if (!pdev->udev)
+                return -ENODEV;
 
         return 0;
 }
@@ -964,6 +959,9 @@ static int start_streaming(struct vb2_queue *vq)
 {
         struct pwc_device *pdev = vb2_get_drv_priv(vq);
 
+        if (!pdev->udev)
+                return -ENODEV;
+
         return pwc_isoc_init(pdev);
 }
 
@@ -971,7 +969,8 @@ static int stop_streaming(struct vb2_queue *vq)
 {
         struct pwc_device *pdev = vb2_get_drv_priv(vq);
 
-        pwc_isoc_cleanup(pdev);
+        if (pdev->udev)
+                pwc_isoc_cleanup(pdev);
         pwc_cleanup_queued_bufs(pdev);
 
         return 0;
@@ -1389,15 +1388,12 @@ static void usb_pwc_disconnect(struct usb_interface *intf)
         struct pwc_device *pdev  = usb_get_intfdata(intf);
 
         mutex_lock(&pdev->modlock);
-        usb_set_intfdata (intf, NULL);
-
-        /* We got unplugged; this is signalled by an EPIPE error code */
-        pdev->error_status = EPIPE;
-        pdev->unplugged = 1;
 
+        usb_set_intfdata(intf, NULL);
         /* No need to keep the urbs around after disconnection */
         pwc_isoc_cleanup(pdev);
         pwc_cleanup_queued_bufs(pdev);
+        pdev->udev = NULL;
 
         mutex_unlock(&pdev->modlock);
 
diff --git a/drivers/media/video/pwc/pwc-v4l.c b/drivers/media/video/pwc/pwc-v4l.c
index cda38837adcd..8bd0a681990d 100644
--- a/drivers/media/video/pwc/pwc-v4l.c
+++ b/drivers/media/video/pwc/pwc-v4l.c
@@ -288,6 +288,9 @@ static int pwc_vidioc_set_fmt(struct pwc_device *pdev, struct v4l2_format *f)
 {
         int ret, fps, snapshot, compression, pixelformat;
 
+        if (!pdev->udev)
+                return -ENODEV;
+
         ret = pwc_vidioc_try_fmt(pdev, f);
         if (ret<0)
                 return ret;
@@ -346,6 +349,9 @@ static int pwc_querycap(struct file *file, void *fh, struct v4l2_capability *cap
         struct video_device *vdev = video_devdata(file);
         struct pwc_device *pdev = video_drvdata(file);
 
+        if (!pdev->udev)
+                return -ENODEV;
+
         strcpy(cap->driver, PWC_NAME);
         strlcpy(cap->card, vdev->name, sizeof(cap->card));
         usb_make_path(pdev->udev, cap->bus_info, sizeof(cap->bus_info));
@@ -414,6 +420,9 @@ static int pwc_g_ctrl(struct file *file, void *fh, struct v4l2_control *c)
         struct pwc_device *pdev = video_drvdata(file);
         int ret;
 
+        if (!pdev->udev)
+                return -ENODEV;
+
         switch (c->id) {
         case V4L2_CID_BRIGHTNESS:
                 c->value = pwc_get_brightness(pdev);
@@ -517,6 +526,9 @@ static int pwc_s_ctrl(struct file *file, void *fh, struct v4l2_control *c)
         struct pwc_device *pdev = video_drvdata(file);
         int ret;
 
+        if (!pdev->udev)
+                return -ENODEV;
+
         switch (c->id) {
         case V4L2_CID_BRIGHTNESS:
                 c->value <<= 9;
@@ -692,6 +704,9 @@ static int pwc_qbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 {
         struct pwc_device *pdev = video_drvdata(file);
 
+        if (!pdev->udev)
+                return -ENODEV;
+
         return vb2_qbuf(&pdev->vb_queue, buf);
 }
 
@@ -699,6 +714,9 @@ static int pwc_dqbuf(struct file *file, void *fh, struct v4l2_buffer *buf)
 {
         struct pwc_device *pdev = video_drvdata(file);
 
+        if (!pdev->udev)
+                return -ENODEV;
+
         return vb2_dqbuf(&pdev->vb_queue, buf, file->f_flags & O_NONBLOCK);
 }
 
@@ -706,6 +724,9 @@ static int pwc_streamon(struct file *file, void *fh, enum v4l2_buf_type i)
 {
         struct pwc_device *pdev = video_drvdata(file);
 
+        if (!pdev->udev)
+                return -ENODEV;
+
         return vb2_streamon(&pdev->vb_queue, i);
 }
 
@@ -713,6 +734,9 @@ static int pwc_streamoff(struct file *file, void *fh, enum v4l2_buf_type i)
 {
         struct pwc_device *pdev = video_drvdata(file);
 
+        if (!pdev->udev)
+                return -ENODEV;
+
         return vb2_streamoff(&pdev->vb_queue, i);
 }
 
diff --git a/drivers/media/video/pwc/pwc.h b/drivers/media/video/pwc/pwc.h
index cfe82319f343..13b85246a261 100644
--- a/drivers/media/video/pwc/pwc.h
+++ b/drivers/media/video/pwc/pwc.h
@@ -161,7 +161,6 @@ struct pwc_device
         int release;            /* release number */
         int features;           /* feature bits */
         char serial[30];        /* serial number (string) */
-        int error_status;       /* set when something goes wrong */
         int usb_init;           /* set when the cam has been initialized */
 
         /*** Video data ***/
@@ -180,7 +179,6 @@ struct pwc_device
         char vsnapshot;         /* snapshot mode */
         char vsync;             /* used by isoc handler */
         char vmirror;           /* for ToUCaM series */
-        char unplugged;
 
         int cmd_len;
         unsigned char cmd_buf[13];