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powerpc/pseries: Cleanup on pseries_eeh_get_state()

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This cleans up pseries_eeh_get_state(), no functional changes:

   * Return EEH_STATE_NOT_SUPPORT early when the 2nd RTAS output
     argument is zero to avoid nested if statements.
   * Skip clearing bits in the PE state represented by variable
     "result" to simplify the code.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Gavin Shan 2015-10-08 14:58:56 +11:00 committed by Michael Ellerman
parent 872ee2d652
commit 00ba05a12b
1 changed files with 26 additions and 34 deletions
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60
arch/powerpc/platforms/pseries/eeh_pseries.c
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@ -433,42 +433,34 @@ static int pseries_eeh_get_state(struct eeh_pe *pe, int *state)
return ret;
/* Parse the result out */
result = 0;
if (rets[1]) {
switch(rets[0]) {
case 0:
result &= ~EEH_STATE_RESET_ACTIVE;
result |= EEH_STATE_MMIO_ACTIVE;
result |= EEH_STATE_DMA_ACTIVE;
break;
case 1:
result |= EEH_STATE_RESET_ACTIVE;
result |= EEH_STATE_MMIO_ACTIVE;
result |= EEH_STATE_DMA_ACTIVE;
break;
case 2:
result &= ~EEH_STATE_RESET_ACTIVE;
result &= ~EEH_STATE_MMIO_ACTIVE;
result &= ~EEH_STATE_DMA_ACTIVE;
break;
case 4:
result &= ~EEH_STATE_RESET_ACTIVE;
result &= ~EEH_STATE_MMIO_ACTIVE;
result &= ~EEH_STATE_DMA_ACTIVE;
result |= EEH_STATE_MMIO_ENABLED;
break;
case 5:
if (rets[2]) {
if (state) *state = rets[2];
result = EEH_STATE_UNAVAILABLE;
} else {
result = EEH_STATE_NOT_SUPPORT;
}
break;
default:
if (!rets[1])
return EEH_STATE_NOT_SUPPORT;
switch(rets[0]) {
case 0:
result = EEH_STATE_MMIO_ACTIVE |
EEH_STATE_DMA_ACTIVE;
break;
case 1:
result = EEH_STATE_RESET_ACTIVE |
EEH_STATE_MMIO_ACTIVE |
EEH_STATE_DMA_ACTIVE;
break;
case 2:
result = 0;
break;
case 4:
result = EEH_STATE_MMIO_ENABLED;
break;
case 5:
if (rets[2]) {
if (state) *state = rets[2];
result = EEH_STATE_UNAVAILABLE;
} else {
result = EEH_STATE_NOT_SUPPORT;
}
} else {
break;
default:
result = EEH_STATE_NOT_SUPPORT;
}