[PATCH 5.10.y] staging: media: av7110: fix sp8870 initialization failure state

[Sasha Levin <sashal@kernel.org>]

From: Punnay Sharma <punnaysharma805@gmail.com>

[ Upstream commit 30684fa98394bc0eb4362282908612aab7d4dad9 ]

The SP8870 DVB frontend driver prematurely flags the device as
initialized at the very beginning of the sp8870_init() routine, prior
to requesting the firmware (dvb-fe-sp8870.fw) and executing the I2C
upload sequence.

If request_firmware() times out or sp8870_firmware_upload() encounters
an I2C bus error, the function aborts and returns -EIO. However,
because `state->initialised` is already set to 1, all subsequent
invocations of `fe->ops.init()` by the DVB core will immediately return
0 (success) without attempting to load the firmware again. This leaves
the demodulator microcontroller halted and the frontend permanently dead
until the module is forcibly reloaded.

Relocate the `state->initialised = 1` assignment to the end of
sp8870_init(), ensuring the flag is only set after the firmware is
successfully uploaded and the system controller is actually restarted.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: stable@vger.kernel.org
Signed-off-by: Punnay Sharma <punnaysharma805@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
[ sashal: Adjusted the patch for the driver's older location and surrounding source context. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/media/dvb-frontends/sp8870.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/media/dvb-frontends/sp8870.c b/drivers/media/dvb-frontends/sp8870.c
index f68479e75e462..3e05ef983fafb 100644
--- a/drivers/media/dvb-frontends/sp8870.c
+++ b/drivers/media/dvb-frontends/sp8870.c
@@ -297,7 +297,6 @@ static int sp8870_init (struct dvb_frontend* fe)
 
 	sp8870_wake_up(state);
 	if (state->initialised) return 0;
-	state->initialised = 1;
 
 	dprintk ("%s\n", __func__);
 
@@ -336,6 +335,8 @@ static int sp8870_init (struct dvb_frontend* fe)
 	sp8870_writereg(state, 0x0D00, 0x010);
 	sp8870_writereg(state, 0x0D01, 0x000);
 
+	state->initialised = 1;
+
 	return 0;
 }
 
-- 
2.53.0