From b662eca098184184a4d9df09835c3740401fb6a0 Mon Sep 17 00:00:00 2001 From: Jitendra Kalsaria Date: Fri, 19 Jul 2013 16:56:33 -0400 Subject: [PATCH] qlcnic: Fix releasing of Tx frag which was never mapped. o Driver was freeing Tx frag which was never mapped before which result into panic as kernel was unable to handle paging request. BUG: unable to handle kernel paging request at ffffc9002552a000 IP: [] qlcnic_release_tx_buffers+0x72/0x170 [qlcnic] PGD 87fc15067 PUD 47febf067 PMD 4758c5067 PTE 0 Oops: 0000 [#1] SMP crash> bt PID: 27343 TASK: ffff8802a5de8080 CPU: 27 COMMAND: "ifconfig" [ffff8802a34b3850] machine_kexec at ffffffff81035b7b [ffff8802a34b38b0] crash_kexec at ffffffff810c0db2 [ffff8802a34b3980] oops_end at ffffffff815111d0 [ffff8802a34b39b0] no_context at ffffffff81046bfb [ffff8802a34b3a00] __bad_area_nosemaphore at ffffffff81046e85 [ffff8802a34b3a50] bad_area_nosemaphore at ffffffff81046f53 [ffff8802a34b3a60] __do_page_fault at ffffffff810476b1 [ffff8802a34b3b80] do_page_fault at ffffffff8151311e [ffff8802a34b3bb0] page_fault at ffffffff815104d5 [exception RIP: qlcnic_release_tx_buffers+114] RIP: ffffffffa05ed762 RSP: ffff8802a34b3c68 RFLAGS: 00010246 RAX: ffff88087989c000 RBX: ffffc90025529ff8 RCX: 0000000000000001 RDX: 0000000000000013 RSI: 0000000000000013 RDI: 0000000000000000 RBP: ffff8802a34b3ca8 R8: 0000000000000000 R9: 0000000000000000 R10: 000000000000000c R11: 0000000000000000 R12: 0000000000000012 R13: ffffc90025529ec0 R14: ffff880761e876e0 R15: 00000000000003ff ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 [ffff8802a34b3cb0] __qlcnic_down at ffffffffa05e8b15 [qlcnic] [ffff8802a34b3d00] qlcnic_close at ffffffffa05e8b78 [qlcnic] [ffff8802a34b3d10] dev_close at ffffffff81449d81 [ffff8802a34b3d30] dev_change_flags at ffffffff814495c1 Signed-off-by: Jitendra Kalsaria Signed-off-by: Sucheta Chakraborty Signed-off-by: David S. Miller --- drivers/net/ethernet/qlogic/qlcnic/qlcnic_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_init.c b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_init.c index d28336f..a202309 100644 --- a/drivers/net/ethernet/qlogic/qlcnic/qlcnic_init.c +++ b/drivers/net/ethernet/qlogic/qlcnic/qlcnic_init.c @@ -142,7 +142,7 @@ void qlcnic_release_tx_buffers(struct qlcnic_adapter *adapter) buffrag->length, PCI_DMA_TODEVICE); buffrag->dma = 0ULL; } - for (j = 0; j < cmd_buf->frag_count; j++) { + for (j = 1; j < cmd_buf->frag_count; j++) { buffrag++; if (buffrag->dma) { pci_unmap_page(adapter->pdev, buffrag->dma, -- 2.7.4