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authorJulia Lawall <julia@diku.dk>2010-10-24 18:16:58 +0200
committerJean Delvare <khali@endymion.delvare>2010-10-24 18:16:58 +0200
commit9cb2c2726e9ae212ccaeecd3eaadcd8d49ac7400 (patch)
treefb551cce7de62fc65c38beef7b014bb405362f61 /drivers/i2c
parentef9d9b8fb696850a95cd59ba2cd67991b6f722b3 (diff)
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i2c-amd8111: Add proper error handling
The functions the functions amd_ec_wait_write and amd_ec_wait_read have an unsigned return type, but return a negative constant to indicate an error condition. A sematic match that finds this problem is as follows: (http://coccinelle.lip6.fr/) // <smpl> @exists@ identifier f; constant C; @@ unsigned f(...) { <+... * return -C; ...+> } // </smpl> Fixing amd_ec_wait_write and amd_ec_wait_read leads to the need to adjust the return type of the functions amd_ec_write and amd_ec_read, which are the only functions that call amd_ec_wait_write and amd_ec_wait_read. amd_ec_write and amd_ec_read, in turn, are only called from within the function amd8111_access, which already returns a signed typed value. Each of the calls to amd_ec_write and amd_ec_read are updated using the following semantic patch: // <smpl> @@ @@ + status = amd_ec_write - amd_ec_write (...); + if (status) return status; @@ @@ + status = amd_ec_read - amd_ec_read (...); + if (status) return status; // </smpl> The patch also adds the declaration of the status variable. Signed-off-by: Julia Lawall <julia@diku.dk> Signed-off-by: Jean Delvare <khali@linux-fr.org>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-amd8111.c163
1 files changed, 113 insertions, 50 deletions
diff --git a/drivers/i2c/busses/i2c-amd8111.c b/drivers/i2c/busses/i2c-amd8111.c
index af1e5e2..6b6a6b1 100644
--- a/drivers/i2c/busses/i2c-amd8111.c
+++ b/drivers/i2c/busses/i2c-amd8111.c
@@ -69,7 +69,7 @@ static struct pci_driver amd8111_driver;
* ACPI 2.0 chapter 13 access of registers of the EC
*/
-static unsigned int amd_ec_wait_write(struct amd_smbus *smbus)
+static int amd_ec_wait_write(struct amd_smbus *smbus)
{
int timeout = 500;
@@ -85,7 +85,7 @@ static unsigned int amd_ec_wait_write(struct amd_smbus *smbus)
return 0;
}
-static unsigned int amd_ec_wait_read(struct amd_smbus *smbus)
+static int amd_ec_wait_read(struct amd_smbus *smbus)
{
int timeout = 500;
@@ -101,7 +101,7 @@ static unsigned int amd_ec_wait_read(struct amd_smbus *smbus)
return 0;
}
-static unsigned int amd_ec_read(struct amd_smbus *smbus, unsigned char address,
+static int amd_ec_read(struct amd_smbus *smbus, unsigned char address,
unsigned char *data)
{
int status;
@@ -124,7 +124,7 @@ static unsigned int amd_ec_read(struct amd_smbus *smbus, unsigned char address,
return 0;
}
-static unsigned int amd_ec_write(struct amd_smbus *smbus, unsigned char address,
+static int amd_ec_write(struct amd_smbus *smbus, unsigned char address,
unsigned char data)
{
int status;
@@ -196,7 +196,7 @@ static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
{
struct amd_smbus *smbus = adap->algo_data;
unsigned char protocol, len, pec, temp[2];
- int i;
+ int i, status;
protocol = (read_write == I2C_SMBUS_READ) ? AMD_SMB_PRTCL_READ
: AMD_SMB_PRTCL_WRITE;
@@ -209,38 +209,62 @@ static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
break;
case I2C_SMBUS_BYTE:
- if (read_write == I2C_SMBUS_WRITE)
- amd_ec_write(smbus, AMD_SMB_CMD, command);
+ if (read_write == I2C_SMBUS_WRITE) {
+ status = amd_ec_write(smbus, AMD_SMB_CMD,
+ command);
+ if (status)
+ return status;
+ }
protocol |= AMD_SMB_PRTCL_BYTE;
break;
case I2C_SMBUS_BYTE_DATA:
- amd_ec_write(smbus, AMD_SMB_CMD, command);
- if (read_write == I2C_SMBUS_WRITE)
- amd_ec_write(smbus, AMD_SMB_DATA, data->byte);
+ status = amd_ec_write(smbus, AMD_SMB_CMD, command);
+ if (status)
+ return status;
+ if (read_write == I2C_SMBUS_WRITE) {
+ status = amd_ec_write(smbus, AMD_SMB_DATA,
+ data->byte);
+ if (status)
+ return status;
+ }
protocol |= AMD_SMB_PRTCL_BYTE_DATA;
break;
case I2C_SMBUS_WORD_DATA:
- amd_ec_write(smbus, AMD_SMB_CMD, command);
+ status = amd_ec_write(smbus, AMD_SMB_CMD, command);
+ if (status)
+ return status;
if (read_write == I2C_SMBUS_WRITE) {
- amd_ec_write(smbus, AMD_SMB_DATA,
- data->word & 0xff);
- amd_ec_write(smbus, AMD_SMB_DATA + 1,
- data->word >> 8);
+ status = amd_ec_write(smbus, AMD_SMB_DATA,
+ data->word & 0xff);
+ if (status)
+ return status;
+ status = amd_ec_write(smbus, AMD_SMB_DATA + 1,
+ data->word >> 8);
+ if (status)
+ return status;
}
protocol |= AMD_SMB_PRTCL_WORD_DATA | pec;
break;
case I2C_SMBUS_BLOCK_DATA:
- amd_ec_write(smbus, AMD_SMB_CMD, command);
+ status = amd_ec_write(smbus, AMD_SMB_CMD, command);
+ if (status)
+ return status;
if (read_write == I2C_SMBUS_WRITE) {
len = min_t(u8, data->block[0],
I2C_SMBUS_BLOCK_MAX);
- amd_ec_write(smbus, AMD_SMB_BCNT, len);
- for (i = 0; i < len; i++)
- amd_ec_write(smbus, AMD_SMB_DATA + i,
- data->block[i + 1]);
+ status = amd_ec_write(smbus, AMD_SMB_BCNT, len);
+ if (status)
+ return status;
+ for (i = 0; i < len; i++) {
+ status =
+ amd_ec_write(smbus, AMD_SMB_DATA + i,
+ data->block[i + 1]);
+ if (status)
+ return status;
+ }
}
protocol |= AMD_SMB_PRTCL_BLOCK_DATA | pec;
break;
@@ -248,19 +272,35 @@ static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
case I2C_SMBUS_I2C_BLOCK_DATA:
len = min_t(u8, data->block[0],
I2C_SMBUS_BLOCK_MAX);
- amd_ec_write(smbus, AMD_SMB_CMD, command);
- amd_ec_write(smbus, AMD_SMB_BCNT, len);
+ status = amd_ec_write(smbus, AMD_SMB_CMD, command);
+ if (status)
+ return status;
+ status = amd_ec_write(smbus, AMD_SMB_BCNT, len);
+ if (status)
+ return status;
if (read_write == I2C_SMBUS_WRITE)
- for (i = 0; i < len; i++)
- amd_ec_write(smbus, AMD_SMB_DATA + i,
- data->block[i + 1]);
+ for (i = 0; i < len; i++) {
+ status =
+ amd_ec_write(smbus, AMD_SMB_DATA + i,
+ data->block[i + 1]);
+ if (status)
+ return status;
+ }
protocol |= AMD_SMB_PRTCL_I2C_BLOCK_DATA;
break;
case I2C_SMBUS_PROC_CALL:
- amd_ec_write(smbus, AMD_SMB_CMD, command);
- amd_ec_write(smbus, AMD_SMB_DATA, data->word & 0xff);
- amd_ec_write(smbus, AMD_SMB_DATA + 1, data->word >> 8);
+ status = amd_ec_write(smbus, AMD_SMB_CMD, command);
+ if (status)
+ return status;
+ status = amd_ec_write(smbus, AMD_SMB_DATA,
+ data->word & 0xff);
+ if (status)
+ return status;
+ status = amd_ec_write(smbus, AMD_SMB_DATA + 1,
+ data->word >> 8);
+ if (status)
+ return status;
protocol = AMD_SMB_PRTCL_PROC_CALL | pec;
read_write = I2C_SMBUS_READ;
break;
@@ -268,11 +308,18 @@ static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
case I2C_SMBUS_BLOCK_PROC_CALL:
len = min_t(u8, data->block[0],
I2C_SMBUS_BLOCK_MAX - 1);
- amd_ec_write(smbus, AMD_SMB_CMD, command);
- amd_ec_write(smbus, AMD_SMB_BCNT, len);
- for (i = 0; i < len; i++)
- amd_ec_write(smbus, AMD_SMB_DATA + i,
- data->block[i + 1]);
+ status = amd_ec_write(smbus, AMD_SMB_CMD, command);
+ if (status)
+ return status;
+ status = amd_ec_write(smbus, AMD_SMB_BCNT, len);
+ if (status)
+ return status;
+ for (i = 0; i < len; i++) {
+ status = amd_ec_write(smbus, AMD_SMB_DATA + i,
+ data->block[i + 1]);
+ if (status)
+ return status;
+ }
protocol = AMD_SMB_PRTCL_BLOCK_PROC_CALL | pec;
read_write = I2C_SMBUS_READ;
break;
@@ -282,24 +329,29 @@ static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
return -EOPNOTSUPP;
}
- amd_ec_write(smbus, AMD_SMB_ADDR, addr << 1);
- amd_ec_write(smbus, AMD_SMB_PRTCL, protocol);
+ status = amd_ec_write(smbus, AMD_SMB_ADDR, addr << 1);
+ if (status)
+ return status;
+ status = amd_ec_write(smbus, AMD_SMB_PRTCL, protocol);
+ if (status)
+ return status;
- /* FIXME this discards status from ec_read(); so temp[0] will
- * hold stack garbage ... the rest of this routine will act
- * nonsensically. Ignored ec_write() status might explain
- * some such failures...
- */
- amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
+ status = amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
+ if (status)
+ return status;
if (~temp[0] & AMD_SMB_STS_DONE) {
udelay(500);
- amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
+ status = amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
+ if (status)
+ return status;
}
if (~temp[0] & AMD_SMB_STS_DONE) {
msleep(1);
- amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
+ status = amd_ec_read(smbus, AMD_SMB_STS, temp + 0);
+ if (status)
+ return status;
}
if ((~temp[0] & AMD_SMB_STS_DONE) || (temp[0] & AMD_SMB_STS_STATUS))
@@ -311,24 +363,35 @@ static s32 amd8111_access(struct i2c_adapter * adap, u16 addr,
switch (size) {
case I2C_SMBUS_BYTE:
case I2C_SMBUS_BYTE_DATA:
- amd_ec_read(smbus, AMD_SMB_DATA, &data->byte);
+ status = amd_ec_read(smbus, AMD_SMB_DATA, &data->byte);
+ if (status)
+ return status;
break;
case I2C_SMBUS_WORD_DATA:
case I2C_SMBUS_PROC_CALL:
- amd_ec_read(smbus, AMD_SMB_DATA, temp + 0);
- amd_ec_read(smbus, AMD_SMB_DATA + 1, temp + 1);
+ status = amd_ec_read(smbus, AMD_SMB_DATA, temp + 0);
+ if (status)
+ return status;
+ status = amd_ec_read(smbus, AMD_SMB_DATA + 1, temp + 1);
+ if (status)
+ return status;
data->word = (temp[1] << 8) | temp[0];
break;
case I2C_SMBUS_BLOCK_DATA:
case I2C_SMBUS_BLOCK_PROC_CALL:
- amd_ec_read(smbus, AMD_SMB_BCNT, &len);
+ status = amd_ec_read(smbus, AMD_SMB_BCNT, &len);
+ if (status)
+ return status;
len = min_t(u8, len, I2C_SMBUS_BLOCK_MAX);
case I2C_SMBUS_I2C_BLOCK_DATA:
- for (i = 0; i < len; i++)
- amd_ec_read(smbus, AMD_SMB_DATA + i,
- data->block + i + 1);
+ for (i = 0; i < len; i++) {
+ status = amd_ec_read(smbus, AMD_SMB_DATA + i,
+ data->block + i + 1);
+ if (status)
+ return status;
+ }
data->block[0] = len;
break;
}