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IB/core: correctly handle rdma_rw_init_mrs() failure
commit b6bc1c7 upstream. Function ib_create_qp() was failing to return an error when rdma_rw_init_mrs() fails, causing a crash further down in ib_create_qp() when trying to dereferece the qp pointer which was actually a negative errno. The crash: crash> log|grep BUG [ 136.458121] BUG: unable to handle kernel NULL pointer dereference at 0000000000000098 crash> bt PID: 3736 TASK: ffff8808543215c0 CPU: 2 COMMAND: "kworker/u64:2" #0 [ffff88084d323340] machine_kexec at ffffffff8105fbb0 Freescale#1 [ffff88084d3233b0] __crash_kexec at ffffffff81116758 Freescale#2 [ffff88084d323480] crash_kexec at ffffffff8111682d Freescale#3 [ffff88084d3234b0] oops_end at ffffffff81032bd6 Freescale#4 [ffff88084d3234e0] no_context at ffffffff8106e431 Freescale#5 [ffff88084d323530] __bad_area_nosemaphore at ffffffff8106e610 Freescale#6 [ffff88084d323590] bad_area_nosemaphore at ffffffff8106e6f4 Freescale#7 [ffff88084d3235a0] __do_page_fault at ffffffff8106ebdc Freescale#8 [ffff88084d323620] do_page_fault at ffffffff8106f057 Freescale#9 [ffff88084d323660] page_fault at ffffffff816e3148 [exception RIP: ib_create_qp+427] RIP: ffffffffa02554fb RSP: ffff88084d323718 RFLAGS: 00010246 RAX: 0000000000000004 RBX: fffffffffffffff4 RCX: 000000018020001f RDX: ffff880830997fc0 RSI: 0000000000000001 RDI: ffff88085f407200 RBP: ffff88084d323778 R8: 0000000000000001 R9: ffffea0020bae210 R10: ffffea0020bae218 R11: 0000000000000001 R12: ffff88084d3237c8 R13: 00000000fffffff4 R14: ffff880859fa5000 R15: ffff88082eb89800 ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018 Freescale#10 [ffff88084d323780] rdma_create_qp at ffffffffa0782681 [rdma_cm] Freescale#11 [ffff88084d3237b0] nvmet_rdma_create_queue_ib at ffffffffa07c43f3 [nvmet_rdma] Freescale#12 [ffff88084d323860] nvmet_rdma_alloc_queue at ffffffffa07c5ba9 [nvmet_rdma] Freescale#13 [ffff88084d323900] nvmet_rdma_queue_connect at ffffffffa07c5c96 [nvmet_rdma] Freescale#14 [ffff88084d323980] nvmet_rdma_cm_handler at ffffffffa07c6450 [nvmet_rdma] Freescale#15 [ffff88084d3239b0] iw_conn_req_handler at ffffffffa0787480 [rdma_cm] Freescale#16 [ffff88084d323a60] cm_conn_req_handler at ffffffffa0775f06 [iw_cm] Freescale#17 [ffff88084d323ab0] process_event at ffffffffa0776019 [iw_cm] Freescale#18 [ffff88084d323af0] cm_work_handler at ffffffffa0776170 [iw_cm] Freescale#19 [ffff88084d323cb0] process_one_work at ffffffff810a1483 Freescale#20 [ffff88084d323d90] worker_thread at ffffffff810a211d Freescale#21 [ffff88084d323ec0] kthread at ffffffff810a6c5c Freescale#22 [ffff88084d323f50] ret_from_fork at ffffffff816e1ebf Fixes: 632bc3f ("IB/core, RDMA RW API: Do not exceed QP SGE send limit") Signed-off-by: Steve Wise <[email protected]> Reviewed-by: Bart Van Assche <[email protected]> Signed-off-by: Doug Ledford <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]>
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