[media] gspca: Don't set gspca_dev->dev to NULL before stop0

In commit a3d6e8cc0e6ddc8b3cfdeb3c979f07ed1aa528b3 gspca_dev->dev is set
to NULL on disconnect, before calling stop0. The plan was to get rid of
gspca_dev->present and instead simply check for gspca_dev->dev everywhere
where we were checking for present. This should be race free since all users
of gspca_dev->dev hold the usb_lock, or so I thought.

But I was wrong, drivers which use a work-queue + synchronous bulk transfers
to get the video data don't hold the usb_lock while doing so, their stop0
callbacks stop the workqueue, so they won't be using gspca_dev->dev anymore
after the stop0 call, but they might be dereferincing it before, so we should
not set gspca_dev->dev to NULL on disconnect before calling stop0.

This also means that the workqueue functions in these drivers cannot
use gspca_dev->dev to check if they need to stop because of disconnection,
so we will need to keep gspca_dev->present around, and set that to 0 on
disconnect, before calling stop0. Unfortunately as part of the plan to remove
gspca_dev->present, these workqueues where already moved over to checking
for gspca_dev->dev instead of gspca_dev->present as part of commit
254902b01d2acc6aced99ec17caa4c6cd890cdea, so this patch also reverts those
parts of that commit.

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

1 files changed, 3 insertions, 3 deletions

diff --git a/drivers/media/usb/gspca/jl2005bcd.c b/drivers/media/usb/gspca/jl2005bcd.c
index 234777116e5f..c4b4a9598db4 100644
--- a/drivers/media/usb/gspca/jl2005bcd.c
+++ b/drivers/media/usb/gspca/jl2005bcd.c
@@ -335,7 +335,7 @@ static void jl2005c_dostream(struct work_struct *work)
 		goto quit_stream;
 	}
 
-	while (gspca_dev->dev && gspca_dev->streaming) {
+	while (gspca_dev->present && gspca_dev->streaming) {
 #ifdef CONFIG_PM
 		if (gspca_dev->frozen)
 			break;
@@ -371,7 +371,7 @@ static void jl2005c_dostream(struct work_struct *work)
 					buffer, act_len);
 			header_read = 1;
 		}
-		while (bytes_left > 0 && gspca_dev->dev) {
+		while (bytes_left > 0 && gspca_dev->present) {
 			data_len = bytes_left > JL2005C_MAX_TRANSFER ?
 				JL2005C_MAX_TRANSFER : bytes_left;
 			ret = usb_bulk_msg(gspca_dev->dev,
@@ -394,7 +394,7 @@ static void jl2005c_dostream(struct work_struct *work)
 		}
 	}
 quit_stream:
-	if (gspca_dev->dev) {
+	if (gspca_dev->present) {
 		mutex_lock(&gspca_dev->usb_lock);
 		jl2005c_stop(gspca_dev);
 		mutex_unlock(&gspca_dev->usb_lock);