[media] dib9000: fix explicit lock mismatches

There are several error paths, where &state->platform.risc.mem_mbx_lock
is not unlocked. The patch fixes it.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/drivers/media/dvb/frontends/dib9000.c b/drivers/media/dvb/frontends/dib9000.c
index 863ef3cfab9f..d96b6a1e65d9 100644
--- a/drivers/media/dvb/frontends/dib9000.c
+++ b/drivers/media/dvb/frontends/dib9000.c
@@ -2208,6 +2208,7 @@ static int dib9000_read_signal_strength(struct dvb_frontend *fe, u16 * strength)
 
         DibAcquireLock(&state->platform.risc.mem_mbx_lock);
         if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0) {
+                DibReleaseLock(&state->platform.risc.mem_mbx_lock);
                 ret = -EIO;
                 goto error;
         }
@@ -2233,8 +2234,10 @@ static u32 dib9000_get_snr(struct dvb_frontend *fe)
         u16 val;
 
         DibAcquireLock(&state->platform.risc.mem_mbx_lock);
-        if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0)
+        if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0) {
+                DibReleaseLock(&state->platform.risc.mem_mbx_lock);
                 return -EIO;
+        }
         dib9000_risc_mem_read(state, FE_MM_R_FE_MONITOR, (u8 *) c, 16 * 2);
         DibReleaseLock(&state->platform.risc.mem_mbx_lock);
 
@@ -2291,6 +2294,7 @@ static int dib9000_read_unc_blocks(struct dvb_frontend *fe, u32 * unc)
         DibAcquireLock(&state->demod_lock);
         DibAcquireLock(&state->platform.risc.mem_mbx_lock);
         if (dib9000_fw_memmbx_sync(state, FE_SYNC_CHANNEL) < 0) {
+                DibReleaseLock(&state->platform.risc.mem_mbx_lock);
                 ret = -EIO;
                 goto error;
         }