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authorJames Smart <jsmart2021@gmail.com>2019-11-21 09:55:56 -0800
committerMartin K. Petersen <martin.petersen@oracle.com>2019-11-21 20:49:50 -0500
commiteede4970fb6c29f2056d7d016a3764c90e9d8a65 (patch)
treefa89560199df9329090780bec49e12583854b71d /drivers/scsi/lpfc/lpfc_init.c
parentscsi: ibmvscsi_tgt: Remove unneeded variable rc (diff)
downloadlinux-dev-eede4970fb6c29f2056d7d016a3764c90e9d8a65.tar.xz
linux-dev-eede4970fb6c29f2056d7d016a3764c90e9d8a65.zip
scsi: lpfc: size cpu map by last cpu id set
Currently the lpfc driver sizes its cpu_map array based on num_possible_cpus(). However, that can be a value that is less than the highest cpu id bit that is set. As such, if a thread runs on a cpu with a larger cpu id, or for_each_possible_cpu() is used, the driver could index off the end of the array and return garbage or GPF. The driver maintains its own internal copy of the "num_possible" cpu value and sizes arrays by it. Fix by setting the driver's value to the value of the last cpu id bit set in the possible_mask - plus 1. Thus cpu_map will be sized to allow access by any cpu id possible. Link: https://lore.kernel.org/r/20191121175556.18953-1-jsmart2021@gmail.com Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com> Signed-off-by: James Smart <jsmart2021@gmail.com> Reviewed-by: Ewan D. Milne <emilne@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to '')
-rw-r--r--drivers/scsi/lpfc/lpfc_init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/lpfc/lpfc_init.c b/drivers/scsi/lpfc/lpfc_init.c
index e9323889f199..cd83617354a1 100644
--- a/drivers/scsi/lpfc/lpfc_init.c
+++ b/drivers/scsi/lpfc/lpfc_init.c
@@ -6460,7 +6460,7 @@ lpfc_sli4_driver_resource_setup(struct lpfc_hba *phba)
u32 if_fam;
phba->sli4_hba.num_present_cpu = lpfc_present_cpu;
- phba->sli4_hba.num_possible_cpu = num_possible_cpus();
+ phba->sli4_hba.num_possible_cpu = cpumask_last(cpu_possible_mask) + 1;
phba->sli4_hba.curr_disp_cpu = 0;
lpfc_cpumask_of_node_init(phba);