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Subject[PATCH AUTOSEL 5.12 34/63] media: dvb: Add check on sp8870_readreg return
Date
From: Alaa Emad <alaaemadhossney.ae@gmail.com>

[ Upstream commit c6d822c56e7fd29e6fa1b1bb91b98f6a1e942b3c ]

The function sp8870_readreg returns a negative value when i2c_transfer
fails so properly check for this and return the error if it happens.

Cc: Sean Young <sean@mess.org>
Cc: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Alaa Emad <alaaemadhossney.ae@gmail.com>
Link: https://lore.kernel.org/r/20210503115736.2104747-60-gregkh@linuxfoundation.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/media/dvb-frontends/sp8870.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/dvb-frontends/sp8870.c b/drivers/media/dvb-frontends/sp8870.c
index ee893a2f2261..9767159aeb9b 100644
--- a/drivers/media/dvb-frontends/sp8870.c
+++ b/drivers/media/dvb-frontends/sp8870.c
@@ -280,7 +280,9 @@ static int sp8870_set_frontend_parameters(struct dvb_frontend *fe)
sp8870_writereg(state, 0xc05, reg0xc05);

// read status reg in order to clear pending irqs
- sp8870_readreg(state, 0x200);
+ err = sp8870_readreg(state, 0x200);
+ if (err < 0)
+ return err;

// system controller start
sp8870_microcontroller_start(state);
--
2.30.2
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