ipc: Handle error conditions in ipc command

Handle error conditions in intel_scu_ipc_command() and
pwr_reg_rdwr().

Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
Signed-off-by: David Cohen <david.a.cohen@linux.intel.com>
Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com>

diff --git a/drivers/platform/x86/intel_scu_ipc.c b/drivers/platform/x86/intel_scu_ipc.c
index 86b6ce2a7a4757c6b842077008c6a7b43d1d507f..e26830f6c8dd512b6c75082a17b08001989e3f74 100644 (file)
--- a/drivers/platform/x86/intel_scu_ipc.c
+++ b/drivers/platform/x86/intel_scu_ipc.c
@@ -235,7 +235,7 @@ static int pwr_reg_rdwr(u16 *addr, u8 *data, u32 count, u32 op, u32 id)
        }
 
        err = busy_loop();
-       if (id == IPC_CMD_PCNTRL_R) { /* Read rbuf */
+       if (!err && id == IPC_CMD_PCNTRL_R) { /* Read rbuf */
                /* Workaround: values are read as 0 without memcpy_fromio */
                memcpy_fromio(cbuf, ipcdev.ipc_base + 0x90, 16);
                for (nc = 0; nc < count; nc++)
@@ -465,8 +465,10 @@ int intel_scu_ipc_command(int cmd, int sub, u32 *in, int inlen,
        ipc_command((inlen << 16) | (sub << 12) | cmd);
        err = busy_loop();
 
-       for (i = 0; i < outlen; i++)
-               *out++ = ipc_data_readl(4 * i);
+       if (!err) {
+               for (i = 0; i < outlen; i++)
+                       *out++ = ipc_data_readl(4 * i);
+       }
 
        mutex_unlock(&ipclock);
        return err;