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intel_scu_ipc: Oops/crash fixes

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- fix reversing of command/sub arguments
- fix a crash if the i2c interface is called before the device is found

Signed-off-by: Sreedhara DS <sreedhara.ds@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Sreedhara DS 2010-07-19 09:37:42 +01:00 committed by Linus Torvalds
parent a9f7f2e74a
commit b4fd4f890b
1 changed files with 8 additions and 4 deletions
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12
drivers/platform/x86/intel_scu_ipc.c
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@ -489,7 +489,7 @@ int intel_scu_ipc_simple_command(int cmd, int sub)
mutex_unlock(&ipclock);
return -ENODEV;
}
ipc_command(cmd << 12 | sub);
ipc_command(sub << 12 | cmd);
err = busy_loop();
mutex_unlock(&ipclock);
return err;
@ -501,9 +501,9 @@ EXPORT_SYMBOL(intel_scu_ipc_simple_command);
* @cmd: command
* @sub: sub type
* @in: input data
* @inlen: input length
* @inlen: input length in dwords
* @out: output data
* @outlein: output length
* @outlein: output length in dwords
*
* Issue a command to the SCU which involves data transfers. Do the
* data copies under the lock but leave it for the caller to interpret
@ -524,7 +524,7 @@ int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
for (i = 0; i < inlen; i++)
ipc_data_writel(*in++, 4 * i);
ipc_command((cmd << 12) | sub | (inlen << 18));
ipc_command((sub << 12) | cmd | (inlen << 18));
err = busy_loop();
for (i = 0; i < outlen; i++)
@ -556,6 +556,10 @@ int intel_scu_ipc_i2c_cntrl(u32 addr, u32 *data)
u32 cmd = 0;
mutex_lock(&ipclock);
if (ipcdev.pdev == NULL) {
mutex_unlock(&ipclock);
return -ENODEV;
}
cmd = (addr >> 24) & 0xFF;
if (cmd == IPC_I2C_READ) {
writel(addr, ipcdev.i2c_base + IPC_I2C_CNTRL_ADDR);