From: Brian King Date: Fri, 3 Aug 2007 03:55:19 +0000 (+1000) Subject: ibmveth: Fix rx pool deactivate oops X-Git-Tag: v2.6.23-rc3~84 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=76b9cfccb39f542ce48a79b9ad50af25e422506c;p=linux-2.6 ibmveth: Fix rx pool deactivate oops This fixes the following oops which can occur when trying to deallocate receive buffer pools using sysfs with the ibmveth driver. NIP: d00000000024f954 LR: d00000000024fa58 CTR: c0000000000d7478 REGS: c00000000ffef9f0 TRAP: 0300 Not tainted (2.6.22-ppc64) MSR: 8000000000009032 CR: 24242442 XER: 00000010 DAR: 00000000000007f0, DSISR: 0000000042000000 TASK = c000000002f91360[2967] 'bash' THREAD: c00000001398c000 CPU: 2 GPR00: 0000000000000000 c00000000ffefc70 d000000000262d30 c00000001c4087a0 GPR04: 00000003000000fe 0000000000000000 000000000000000f c000000000579d80 GPR08: 0000000000365688 c00000001c408998 00000000000007f0 0000000000000000 GPR12: d000000000251e88 c000000000579d80 00000000200957ec 0000000000000000 GPR16: 00000000100b8808 00000000100feb30 0000000000000000 0000000010084828 GPR20: 0000000000000000 000000001014d4d0 0000000000000010 c00000000ffefeb0 GPR24: c00000001c408000 0000000000000000 c00000001c408000 00000000ffffb054 GPR28: 00000000000000fe 0000000000000003 d000000000262700 c00000001c4087a0 NIP [d00000000024f954] .ibmveth_remove_buffer_from_pool+0x38/0x108 [ibmveth] LR [d00000000024fa58] .ibmveth_rxq_harvest_buffer+0x34/0x78 [ibmveth] Call Trace: [c00000000ffefc70] [c0000000000280a8] .dma_iommu_unmap_single+0x14/0x28 (unreliable) [c00000000ffefd00] [d00000000024fa58] .ibmveth_rxq_harvest_buffer+0x34/0x78 [ibmveth] [c00000000ffefd80] [d000000000250e40] .ibmveth_poll+0xd8/0x434 [ibmveth] [c00000000ffefe40] [c00000000032da8c] .net_rx_action+0xdc/0x248 [c00000000ffefef0] [c000000000068b4c] .__do_softirq+0xa8/0x164 [c00000000ffeff90] [c00000000002789c] .call_do_softirq+0x14/0x24 [c00000001398f6f0] [c00000000000c04c] .do_softirq+0x68/0xac [c00000001398f780] [c000000000068ca0] .irq_exit+0x54/0x6c [c00000001398f800] [c00000000000c8e4] .do_IRQ+0x170/0x1ac [c00000001398f890] [c000000000004790] hardware_interrupt_entry+0x18/0x1c Exception: 501 at .plpar_hcall_norets+0x24/0x94 LR = .veth_pool_store+0x15c/0x298 [ibmveth] [c00000001398fb80] [d000000000250b2c] .veth_pool_store+0x5c/0x298 [ibmveth] (unreliable) [c00000001398fc30] [c000000000145530] .sysfs_write_file+0x140/0x1d8 [c00000001398fcf0] [c0000000000de89c] .vfs_write+0x120/0x208 [c00000001398fd90] [c0000000000df2c8] .sys_write+0x4c/0x8c [c00000001398fe30] [c0000000000086ac] syscall_exit+0x0/0x40 Instruction dump: fba1ffe8 fbe1fff8 789d0022 f8010010 f821ff71 789c0020 1d3d00a8 7b8a1f24 38000000 7c7f1b78 7d291a14 e9690128 <7c0a592a> e8030000 e9690120 80a90100 Signed-off-by: Brian King Signed-off-by: Paul Mackerras Signed-off-by: Jeff Garzik --- diff --git a/drivers/net/ibmveth.c b/drivers/net/ibmveth.c index d96eb72295..cf4a92436a 100644 --- a/drivers/net/ibmveth.c +++ b/drivers/net/ibmveth.c @@ -1280,24 +1280,28 @@ const char * buf, size_t count) int i; /* Make sure there is a buffer pool with buffers that can hold a packet of the size of the MTU */ - for(i = 0; irx_buff_pool[i]) continue; if (!adapter->rx_buff_pool[i].active) continue; - if (mtu < adapter->rx_buff_pool[i].buff_size) { - pool->active = 0; - h_free_logical_lan_buffer(adapter-> - vdev-> - unit_address, - pool-> - buff_size); - } + if (mtu <= adapter->rx_buff_pool[i].buff_size) + break; } - if (pool->active) { + + if (i == IbmVethNumBufferPools) { ibmveth_error_printk("no active pool >= MTU\n"); return -EPERM; } + + pool->active = 0; + if (netif_running(netdev)) { + adapter->pool_config = 1; + ibmveth_close(netdev); + adapter->pool_config = 0; + if ((rc = ibmveth_open(netdev))) + return rc; + } } } else if (attr == &veth_num_attr) { if (value <= 0 || value > IBMVETH_MAX_POOL_COUNT) diff --git a/drivers/net/ibmveth.h b/drivers/net/ibmveth.h index bb69ccae8a..72cc15a6ca 100644 --- a/drivers/net/ibmveth.h +++ b/drivers/net/ibmveth.h @@ -73,9 +73,6 @@ static inline long h_send_logical_lan(unsigned long unit_address, #define h_change_logical_lan_mac(ua, mac) \ plpar_hcall_norets(H_CHANGE_LOGICAL_LAN_MAC, ua, mac) -#define h_free_logical_lan_buffer(ua, bufsize) \ - plpar_hcall_norets(H_FREE_LOGICAL_LAN_BUFFER, ua, bufsize) - #define IbmVethNumBufferPools 5 #define IBMVETH_BUFF_OH 22 /* Overhead: 14 ethernet header + 8 opaque handle */ #define IBMVETH_MAX_MTU 68