| Message ID | 20081222184211.GV6958@localdomain |
|---|---|
| State | Accepted, archived |
| Delegated to: | David Miller |
| Headers | show |
On Mon, 22 Dec 2008 12:42:11 CST, Nathan Lynch wrote: > With slub debug enabled, I see the following errors and crash with > 2.6.28-rc9: > > IBM eHEA ethernet device driver (Release EHEA_0095) > ehea: Error in ehea_h_register_rpage_mr: not on pageboundary > ehea: Error in ehea_reg_mr_section: register_rpage_mr failed > ehea: Error in ehea_reg_kernel_mr: registering mr failed > ehea: Error in ehea_setup_ports: creating MR failed > ehea 23c00100.lhea: setup_ports failed > Unable to handle kernel paging request for data at address 0x6b6b6b6b6b6bbdcb > Faulting instruction address: 0xd000000000064a24 > cpu 0x0: Vector: 300 (Data Access) at [c0000000740e7190] > pc: d000000000064a24: .ehea_update_firmware_handles+0x84/0x47c [ehea] > lr: d00000000006df34: .ehea_probe_adapter+0x35c/0x39c [ehea] > sp: c0000000740e7410 > msr: 8000000000009032 > dar: 6b6b6b6b6b6bbdcb > dsisr: 40000000 > current = 0xc000000074233780 > paca = 0xc0000000008a3300 > pid = 2046, comm = modprobe > enter ? for help > [c0000000740e74f0] d00000000006df34 .ehea_probe_adapter+0x35c/0x39c [ehea] > [c0000000740e75a0] c00000000041d5a4 .of_platform_device_probe+0x78/0xb0 > [c0000000740e7630] c0000000002d8b38 .driver_probe_device+0x13c/0x200 > [c0000000740e76c0] c0000000002d8c90 .__driver_attach+0x94/0xd8 > [c0000000740e7750] c0000000002d7d64 .bus_for_each_dev+0x80/0xd8 > [c0000000740e7800] c0000000002d889c .driver_attach+0x28/0x40 > [c0000000740e7880] c0000000002d8340 .bus_add_driver+0xd4/0x284 > [c0000000740e7920] c0000000002d90a0 .driver_register+0xc4/0x198 > [c0000000740e79d0] c00000000041d45c .of_register_driver+0x4c/0x60 > [c0000000740e7a50] c000000000020ef8 .ibmebus_register_driver+0x30/0x4c > [c0000000740e7ae0] d00000000006e108 .ehea_module_init+0x194/0x208c [ehea] > [c0000000740e7b90] c000000000009028 .do_one_initcall+0x90/0x1ac > [c0000000740e7d90] c00000000008619c .sys_init_module+0xc4/0x200 > [c0000000740e7e30] c0000000000084ac syscall_exit+0x0/0x40 > > (When slub debug is disabled it works fine.) > > PAGE_SIZE allocations via slab are not guaranteed to be page-aligned; > use get_zeroed_page for the 'pt' buffer (I don't really know what this > is, only that it is passed to firmware and that the first error > message complains about its alignment). This allows the system to > boot. > > Signed-off-by: Nathan Lynch <ntl@pobox.com> > --- > drivers/net/ehea/ehea_qmr.c | 4 ++-- > 1 files changed, 2 insertions(+), 2 deletions(-) > > By the way, there are several other kzalloc(PAGE_SIZE) call sites in > this driver; are they also making assumptions about alignment? meh. I would say yes, pretty much everything is expecting a page alignment (4K at least). ++doug -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/net/ehea/ehea_qmr.c b/drivers/net/ehea/ehea_qmr.c index 9d00687..b7b0937 100644 --- a/drivers/net/ehea/ehea_qmr.c +++ b/drivers/net/ehea/ehea_qmr.c @@ -893,7 +893,7 @@ int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr) unsigned long top; - pt = kzalloc(PAGE_SIZE, GFP_KERNEL); + pt = (void *)get_zeroed_page(GFP_KERNEL); if (!pt) { ehea_error("no mem"); ret = -ENOMEM; @@ -937,7 +937,7 @@ int ehea_reg_kernel_mr(struct ehea_adapter *adapter, struct ehea_mr *mr) mr->adapter = adapter; ret = 0; out: - kfree(pt); + free_page((unsigned long)pt); return ret; }
With slub debug enabled, I see the following errors and crash with 2.6.28-rc9: IBM eHEA ethernet device driver (Release EHEA_0095) ehea: Error in ehea_h_register_rpage_mr: not on pageboundary ehea: Error in ehea_reg_mr_section: register_rpage_mr failed ehea: Error in ehea_reg_kernel_mr: registering mr failed ehea: Error in ehea_setup_ports: creating MR failed ehea 23c00100.lhea: setup_ports failed Unable to handle kernel paging request for data at address 0x6b6b6b6b6b6bbdcb Faulting instruction address: 0xd000000000064a24 cpu 0x0: Vector: 300 (Data Access) at [c0000000740e7190] pc: d000000000064a24: .ehea_update_firmware_handles+0x84/0x47c [ehea] lr: d00000000006df34: .ehea_probe_adapter+0x35c/0x39c [ehea] sp: c0000000740e7410 msr: 8000000000009032 dar: 6b6b6b6b6b6bbdcb dsisr: 40000000 current = 0xc000000074233780 paca = 0xc0000000008a3300 pid = 2046, comm = modprobe enter ? for help [c0000000740e74f0] d00000000006df34 .ehea_probe_adapter+0x35c/0x39c [ehea] [c0000000740e75a0] c00000000041d5a4 .of_platform_device_probe+0x78/0xb0 [c0000000740e7630] c0000000002d8b38 .driver_probe_device+0x13c/0x200 [c0000000740e76c0] c0000000002d8c90 .__driver_attach+0x94/0xd8 [c0000000740e7750] c0000000002d7d64 .bus_for_each_dev+0x80/0xd8 [c0000000740e7800] c0000000002d889c .driver_attach+0x28/0x40 [c0000000740e7880] c0000000002d8340 .bus_add_driver+0xd4/0x284 [c0000000740e7920] c0000000002d90a0 .driver_register+0xc4/0x198 [c0000000740e79d0] c00000000041d45c .of_register_driver+0x4c/0x60 [c0000000740e7a50] c000000000020ef8 .ibmebus_register_driver+0x30/0x4c [c0000000740e7ae0] d00000000006e108 .ehea_module_init+0x194/0x208c [ehea] [c0000000740e7b90] c000000000009028 .do_one_initcall+0x90/0x1ac [c0000000740e7d90] c00000000008619c .sys_init_module+0xc4/0x200 [c0000000740e7e30] c0000000000084ac syscall_exit+0x0/0x40 (When slub debug is disabled it works fine.) PAGE_SIZE allocations via slab are not guaranteed to be page-aligned; use get_zeroed_page for the 'pt' buffer (I don't really know what this is, only that it is passed to firmware and that the first error message complains about its alignment). This allows the system to boot. Signed-off-by: Nathan Lynch <ntl@pobox.com> --- drivers/net/ehea/ehea_qmr.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) By the way, there are several other kzalloc(PAGE_SIZE) call sites in this driver; are they also making assumptions about alignment?