From: Sam Bobroff sbobroff@linux.ibm.com
[ Upstream commit 6fa13640aea7bb0760846981aa2da4245307bd26 ]
If a device is hot unplgged during EEH recovery, it's possible for the RTAS call to ibm,configure-pe in pseries_eeh_configure() to return parameter error (-3), however negative return values are not checked for and this leads to an infinite loop.
Fix this by correctly bailing out on negative values.
Signed-off-by: Sam Bobroff sbobroff@linux.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Reviewed-by: Nathan Lynch nathanl@linux.ibm.com Link: https://lore.kernel.org/r/1b0a6010a647dc915816e44845b64d72066676a7.158804550... Stable-dep-of: 9aafbfa5f57a ("powerpc/pseries/eeh: use correct API for error log size") Signed-off-by: Sasha Levin sashal@kernel.org --- arch/powerpc/platforms/pseries/eeh_pseries.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/platforms/pseries/eeh_pseries.c b/arch/powerpc/platforms/pseries/eeh_pseries.c index 2713d2aa963c..0fc93f7e167d 100644 --- a/arch/powerpc/platforms/pseries/eeh_pseries.c +++ b/arch/powerpc/platforms/pseries/eeh_pseries.c @@ -684,6 +684,8 @@ static int pseries_eeh_configure_bridge(struct eeh_pe *pe)
if (!ret) return ret; + if (ret < 0) + break;
/* * If RTAS returns a delay value that's above 100ms, cut it @@ -704,7 +706,11 @@ static int pseries_eeh_configure_bridge(struct eeh_pe *pe)
pr_warn("%s: Unable to configure bridge PHB#%x-PE#%x (%d)\n", __func__, pe->phb->global_number, pe->addr, ret); - return ret; + /* PAPR defines -3 as "Parameter Error" for this function: */ + if (ret == -3) + return -EINVAL; + else + return -EIO; }
/**