media: saa7134-input: improve error handling

Currently, the code produces those false-positives:
	drivers/media/pci/saa7134/saa7134-input.c:203 get_key_msi_tvanywhere_plus() error: uninitialized symbol 'b'.
	drivers/media/pci/saa7134/saa7134-input.c:251 get_key_kworld_pc150u() error: uninitialized symbol 'b'.
	drivers/media/pci/saa7134/saa7134-input.c:275 get_key_purpletv() error: uninitialized symbol 'b'.

Improve the error handling code, making it to look like our
coding style.

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

diff --git a/drivers/media/pci/saa7134/saa7134-input.c b/drivers/media/pci/saa7134/saa7134-input.c
index 33ee8322895e01bcdf33a25226621e5b0f541c08..0e28c5021ac480f733cace74fa401b252da4d5ab 100644 (file)
--- a/drivers/media/pci/saa7134/saa7134-input.c
+++ b/drivers/media/pci/saa7134/saa7134-input.c
@@ -115,7 +115,7 @@ static int build_key(struct saa7134_dev *dev)
 static int get_key_flydvb_trio(struct IR_i2c *ir, enum rc_proto *protocol,
                               u32 *scancode, u8 *toggle)
 {
-       int gpio;
+       int gpio, rc;
        int attempt = 0;
        unsigned char b;
 
@@ -153,8 +153,11 @@ static int get_key_flydvb_trio(struct IR_i2c *ir, enum rc_proto *protocol,
                       attempt);
                return -EIO;
        }
-       if (1 != i2c_master_recv(ir->c, &b, 1)) {
+       rc = i2c_master_recv(ir->c, &b, 1);
+       if (rc != 1) {
                ir_dbg(ir, "read error\n");
+               if (rc < 0)
+                       return rc;
                return -EIO;
        }
 
@@ -169,7 +172,7 @@ static int get_key_msi_tvanywhere_plus(struct IR_i2c *ir,
                                       u32 *scancode, u8 *toggle)
 {
        unsigned char b;
-       int gpio;
+       int gpio, rc;
 
        /* <dev> is needed to access GPIO. Used by the saa_readl macro. */
        struct saa7134_dev *dev = ir->c->adapter->algo_data;
@@ -193,8 +196,11 @@ static int get_key_msi_tvanywhere_plus(struct IR_i2c *ir,
 
        /* GPIO says there is a button press. Get it. */
 
-       if (1 != i2c_master_recv(ir->c, &b, 1)) {
+       rc = i2c_master_recv(ir->c, &b, 1);
+       if (rc != 1) {
                ir_dbg(ir, "read error\n");
+               if (rc < 0)
+                       return rc;
                return -EIO;
        }
 
@@ -218,6 +224,7 @@ static int get_key_kworld_pc150u(struct IR_i2c *ir, enum rc_proto *protocol,
 {
        unsigned char b;
        unsigned int gpio;
+       int rc;
 
        /* <dev> is needed to access GPIO. Used by the saa_readl macro. */
        struct saa7134_dev *dev = ir->c->adapter->algo_data;
@@ -241,8 +248,11 @@ static int get_key_kworld_pc150u(struct IR_i2c *ir, enum rc_proto *protocol,
 
        /* GPIO says there is a button press. Get it. */
 
-       if (1 != i2c_master_recv(ir->c, &b, 1)) {
+       rc = i2c_master_recv(ir->c, &b, 1);
+       if (rc != 1) {
                ir_dbg(ir, "read error\n");
+               if (rc < 0)
+                       return rc;
                return -EIO;
        }
 
@@ -263,11 +273,15 @@ static int get_key_kworld_pc150u(struct IR_i2c *ir, enum rc_proto *protocol,
 static int get_key_purpletv(struct IR_i2c *ir, enum rc_proto *protocol,
                            u32 *scancode, u8 *toggle)
 {
+       int rc;
        unsigned char b;
 
        /* poll IR chip */
-       if (1 != i2c_master_recv(ir->c, &b, 1)) {
+       rc = i2c_master_recv(ir->c, &b, 1);
+       if (rc != 1) {
                ir_dbg(ir, "read error\n");
+               if (rc < 0)
+                       return rc;
                return -EIO;
        }
 
@@ -288,11 +302,17 @@ static int get_key_purpletv(struct IR_i2c *ir, enum rc_proto *protocol,
 static int get_key_hvr1110(struct IR_i2c *ir, enum rc_proto *protocol,
                           u32 *scancode, u8 *toggle)
 {
+       int rc;
        unsigned char buf[5];
 
        /* poll IR chip */
-       if (5 != i2c_master_recv(ir->c, buf, 5))
+       rc = i2c_master_recv(ir->c, buf, 5);
+       if (rc != 5) {
+               ir_dbg(ir, "read error\n");
+               if (rc < 0)
+                       return rc;
                return -EIO;
+       }
 
        /* Check if some key were pressed */
        if (!(buf[0] & 0x80))
@@ -319,6 +339,7 @@ static int get_key_hvr1110(struct IR_i2c *ir, enum rc_proto *protocol,
 static int get_key_beholdm6xx(struct IR_i2c *ir, enum rc_proto *protocol,
                              u32 *scancode, u8 *toggle)
 {
+       int rc;
        unsigned char data[12];
        u32 gpio;
 
@@ -335,8 +356,11 @@ static int get_key_beholdm6xx(struct IR_i2c *ir, enum rc_proto *protocol,
 
        ir->c->addr = 0x5a >> 1;
 
-       if (12 != i2c_master_recv(ir->c, data, 12)) {
+       rc = i2c_master_recv(ir->c, data, 12);
+       if (rc != 12) {
                ir_dbg(ir, "read error\n");
+               if (rc < 0)
+                       return rc;
                return -EIO;
        }
 
@@ -356,12 +380,16 @@ static int get_key_pinnacle(struct IR_i2c *ir, enum rc_proto *protocol,
                            u32 *scancode, u8 *toggle, int parity_offset,
                            int marker, int code_modulo)
 {
+       int rc;
        unsigned char b[4];
        unsigned int start = 0,parity = 0,code = 0;
 
        /* poll IR chip */
-       if (4 != i2c_master_recv(ir->c, b, 4)) {
+       rc = i2c_master_recv(ir->c, b, 4);
+       if (rc != 4) {
                ir_dbg(ir, "read error\n");
+               if (rc < 0)
+                       return rc;
                return -EIO;
        }