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scsi: pm80xx: Set phy->enable_completion only when we wait for it

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pm8001_phy_control() populates the enable_completion pointer with a stack
address, sends a PHY_LINK_RESET / PHY_HARD_RESET, waits 300 ms, and
returns. The problem arises when a phy control response comes late.  After
300 ms the pm8001_phy_control() function returns and the passed
enable_completion stack address is no longer valid. Late phy control
response invokes complete() on a dangling enable_completion pointer which
leads to a kernel crash.

Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
Signed-off-by: Terrence Adams <tadamsjr@google.com>
Link: https://lore.kernel.org/r/20240627155924.2361370-2-tadamsjr@google.com
Acked-by: Jack Wang <jinpu.wang@ionos.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Igor Pylypiv 2024-06-27 15:59:23 +00:00 committed by Martin K. Petersen
parent 7cbff570db
commit e4f949ef15
1 changed files with 3 additions and 1 deletions
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4
drivers/scsi/pm8001/pm8001_sas.c
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@ -166,7 +166,6 @@ int pm8001_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
unsigned long flags;
pm8001_ha = sas_phy->ha->lldd_ha;
phy = &pm8001_ha->phy[phy_id];
pm8001_ha->phy[phy_id].enable_completion = &completion;
if (PM8001_CHIP_DISP->fatal_errors(pm8001_ha)) {
/*
@ -190,6 +189,7 @@ int pm8001_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
rates->maximum_linkrate;
}
if (pm8001_ha->phy[phy_id].phy_state == PHY_LINK_DISABLE) {
pm8001_ha->phy[phy_id].enable_completion = &completion;
PM8001_CHIP_DISP->phy_start_req(pm8001_ha, phy_id);
wait_for_completion(&completion);
}
@ -198,6 +198,7 @@ int pm8001_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
break;
case PHY_FUNC_HARD_RESET:
if (pm8001_ha->phy[phy_id].phy_state == PHY_LINK_DISABLE) {
pm8001_ha->phy[phy_id].enable_completion = &completion;
PM8001_CHIP_DISP->phy_start_req(pm8001_ha, phy_id);
wait_for_completion(&completion);
}
@ -206,6 +207,7 @@ int pm8001_phy_control(struct asd_sas_phy *sas_phy, enum phy_func func,
break;
case PHY_FUNC_LINK_RESET:
if (pm8001_ha->phy[phy_id].phy_state == PHY_LINK_DISABLE) {
pm8001_ha->phy[phy_id].enable_completion = &completion;
PM8001_CHIP_DISP->phy_start_req(pm8001_ha, phy_id);
wait_for_completion(&completion);
}