media: drxd_hard: better handle I2C errors

As warned by smatch:
	drivers/media/dvb-frontends/drxd_hard.c:989 HI_Command() error: uninitialized symbol 'waitCmd'.
	drivers/media/dvb-frontends/drxd_hard.c:1306 SC_WaitForReady() error: uninitialized symbol 'curCmd'.
	drivers/media/dvb-frontends/drxd_hard.c:1322 SC_SendCommand() error: uninitialized symbol 'errCode'.
	drivers/media/dvb-frontends/drxd_hard.c:1339 SC_ProcStartCommand() error: uninitialized symbol 'scExec'.

The error handling on several places are somewhat flawed, as
they don't check if Read16() returns an error.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>

diff --git a/drivers/media/dvb-frontends/drxd_hard.c b/drivers/media/dvb-frontends/drxd_hard.c
index 0696bc62dcc90784bc3d9c6cfa945de7ec410bba..3215d003b2a1d88a473838722ad714508a696d7e 100644 (file)
--- a/drivers/media/dvb-frontends/drxd_hard.c
+++ b/drivers/media/dvb-frontends/drxd_hard.c
@@ -972,7 +972,6 @@ static int DownloadMicrocode(struct drxd_state *state,
 static int HI_Command(struct drxd_state *state, u16 cmd, u16 * pResult)
 {
        u32 nrRetries = 0;
-       u16 waitCmd;
        int status;
 
        status = Write16(state, HI_RA_RAM_SRV_CMD__A, cmd, 0);
@@ -985,8 +984,8 @@ static int HI_Command(struct drxd_state *state, u16 cmd, u16 * pResult)
                        status = -1;
                        break;
                }
-               status = Read16(state, HI_RA_RAM_SRV_CMD__A, &waitCmd, 0);
-       } while (waitCmd != 0);
+               status = Read16(state, HI_RA_RAM_SRV_CMD__A, NULL, 0);
+       } while (status != 0);
 
        if (status >= 0)
                status = Read16(state, HI_RA_RAM_SRV_RES__A, pResult, 0);
@@ -1298,12 +1297,11 @@ static int InitFT(struct drxd_state *state)
 
 static int SC_WaitForReady(struct drxd_state *state)
 {
-       u16 curCmd;
        int i;
 
        for (i = 0; i < DRXD_MAX_RETRIES; i += 1) {
-               int status = Read16(state, SC_RA_RAM_CMD__A, &curCmd, 0);
-               if (status == 0 || curCmd == 0)
+               int status = Read16(state, SC_RA_RAM_CMD__A, NULL, 0);
+               if (status == 0)
                        return status;
        }
        return -1;
@@ -1311,15 +1309,15 @@ static int SC_WaitForReady(struct drxd_state *state)
 
 static int SC_SendCommand(struct drxd_state *state, u16 cmd)
 {
-       int status = 0;
+       int status = 0, ret;
        u16 errCode;
 
        Write16(state, SC_RA_RAM_CMD__A, cmd, 0);
        SC_WaitForReady(state);
 
-       Read16(state, SC_RA_RAM_CMD_ADDR__A, &errCode, 0);
+       ret = Read16(state, SC_RA_RAM_CMD_ADDR__A, &errCode, 0);
 
-       if (errCode == 0xFFFF) {
+       if (ret < 0 || errCode == 0xFFFF) {
                printk(KERN_ERR "Command Error\n");
                status = -1;
        }
@@ -1330,13 +1328,13 @@ static int SC_SendCommand(struct drxd_state *state, u16 cmd)
 static int SC_ProcStartCommand(struct drxd_state *state,
                               u16 subCmd, u16 param0, u16 param1)
 {
-       int status = 0;
+       int ret, status = 0;
        u16 scExec;
 
        mutex_lock(&state->mutex);
        do {
-               Read16(state, SC_COMM_EXEC__A, &scExec, 0);
-               if (scExec != 1) {
+               ret = Read16(state, SC_COMM_EXEC__A, &scExec, 0);
+               if (ret < 0 || scExec != 1) {
                        status = -1;
                        break;
                }