From: Sam Bobroff <sbobroff@xxxxxxxxxxxxx> [ 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@xxxxxxxxxxxxx> Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Reviewed-by: Nathan Lynch <nathanl@xxxxxxxxxxxxx> Link: https://lore.kernel.org/r/1b0a6010a647dc915816e44845b64d72066676a7.1588045502.git.sbobroff@xxxxxxxxxxxxx Stable-dep-of: 9aafbfa5f57a ("powerpc/pseries/eeh: use correct API for error log size") Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- 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 893ba3f562c4..04c1ed79bc6e 100644 --- a/arch/powerpc/platforms/pseries/eeh_pseries.c +++ b/arch/powerpc/platforms/pseries/eeh_pseries.c @@ -607,6 +607,8 @@ 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 @@ -627,7 +629,11 @@ 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; } /** -- 2.35.1
