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| author | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-11 22:23:57 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-02-11 23:28:34 +1100 |
| commit | dea6f4c696996b9dff37f4e6690eb30e0878ace9 (patch) | |
| tree | c8069ea1c2525f0af9959b4489f5af85f7178545 /arch | |
| parent | e7eb919057c3450cdd9d335e4a23a4da8da58db4 (diff) | |
| download | linux-dea6f4c696996b9dff37f4e6690eb30e0878ace9.tar.gz linux-dea6f4c696996b9dff37f4e6690eb30e0878ace9.tar.bz2 linux-dea6f4c696996b9dff37f4e6690eb30e0878ace9.zip | |
powerpc/powernv/pci: Use kzalloc() for phb related allocations
As part of commit fbbefb320214 ("powerpc/pci: Move PHB discovery for
PCI_DN using platforms"), I switched some allocations from
memblock_alloc() to kmalloc(), otherwise memblock would warn that it
was being called after slab init.
However I missed that the code relied on the allocations being zeroed,
without which we could end up crashing:
pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to ff
BUG: Unable to handle kernel data access on read at 0x6b6b6b6b6b6b6af7
Faulting instruction address: 0xc0000000000dbc90
Oops: Kernel access of bad area, sig: 11 [#1]
LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV
...
NIP pnv_ioda_get_pe_state+0xe0/0x1d0
LR pnv_ioda_get_pe_state+0xb4/0x1d0
Call Trace:
pnv_ioda_get_pe_state+0xb4/0x1d0 (unreliable)
pnv_pci_config_check_eeh.isra.9+0x78/0x270
pnv_pci_read_config+0xf8/0x160
pci_bus_read_config_dword+0xa4/0x120
pci_bus_generic_read_dev_vendor_id+0x54/0x270
pci_scan_single_device+0xb8/0x140
pci_scan_slot+0x80/0x1b0
pci_scan_child_bus_extend+0x94/0x490
pcibios_scan_phb+0x1f8/0x3c0
pcibios_init+0x8c/0x12c
do_one_initcall+0x94/0x510
kernel_init_freeable+0x35c/0x3fc
kernel_init+0x2c/0x168
ret_from_kernel_thread+0x5c/0x70
Switch them to kzalloc().
Fixes: fbbefb320214 ("powerpc/pci: Move PHB discovery for PCI_DN using platforms")
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210211112749.3410771-1-mpe@ellerman.id.au
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/platforms/powernv/pci-ioda.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c index 7ee14ac275bd..f0f901683a2f 100644 --- a/arch/powerpc/platforms/powernv/pci-ioda.c +++ b/arch/powerpc/platforms/powernv/pci-ioda.c @@ -2921,7 +2921,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np, phb_id = be64_to_cpup(prop64); pr_debug(" PHB-ID : 0x%016llx\n", phb_id); - phb = kmalloc(sizeof(*phb), GFP_KERNEL); + phb = kzalloc(sizeof(*phb), GFP_KERNEL); if (!phb) panic("%s: Failed to allocate %zu bytes\n", __func__, sizeof(*phb)); @@ -2970,7 +2970,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np, else phb->diag_data_size = PNV_PCI_DIAG_BUF_SIZE; - phb->diag_data = kmalloc(phb->diag_data_size, GFP_KERNEL); + phb->diag_data = kzalloc(phb->diag_data_size, GFP_KERNEL); if (!phb->diag_data) panic("%s: Failed to allocate %u bytes\n", __func__, phb->diag_data_size); @@ -3032,7 +3032,7 @@ static void __init pnv_pci_init_ioda_phb(struct device_node *np, } pemap_off = size; size += phb->ioda.total_pe_num * sizeof(struct pnv_ioda_pe); - aux = kmalloc(size, GFP_KERNEL); + aux = kzalloc(size, GFP_KERNEL); if (!aux) panic("%s: Failed to allocate %lu bytes\n", __func__, size); |