[SRU][O][PATCH 0/1] BMG: fix EFAULT handling

[Thibault Ferrante]

BugLink: https://bugs.launchpad.net/bugs/2102657

[ Impact ]

 * EFAULT is handled as a non-fatal error that can trigger more issues due to bad handling such as

    [ 191.738349] WARNING: CPU: 1 PID: 157 at drivers/gpu/drm/xe/xe_res_cursor.h:158 xe_pt_stage_bind.constprop.0+0x60a/0x6b0 [xe]
    [ 191.738551] Workqueue: xe-ordered-wq preempt_rebind_work_func [xe]
    [ 191.738616] RIP: 0010:xe_pt_stage_bind.constprop.0+0x60a/0x6b0 [xe]
    [ 191.738690] Call Trace:
    [ 191.738692] <TASK>
    [ 191.738694] ? show_regs+0x69/0x80
    [ 191.738698] ? __warn+0x93/0x1a0
    [ 191.738703] ? xe_pt_stage_bind.constprop.0+0x60a/0x6b0 [xe]
    [ 191.738759] ? report_bug+0x18f/0x1a0
    [ 191.738764] ? handle_bug+0x63/0xa0
    [ 191.738767] ? exc_invalid_op+0x19/0x70
    [ 191.738770] ? asm_exc_invalid_op+0x1b/0x20
    [ 191.738777] ? xe_pt_stage_bind.constprop.0+0x60a/0x6b0 [xe]
    [ 191.738834] ? ret_from_fork_asm+0x1a/0x30
    [ 191.738849] bind_op_prepare+0x105/0x7b0 [xe]
    [ 191.738906] ? dma_resv_reserve_fences+0x301/0x380
    [ 191.738912] xe_pt_update_ops_prepare+0x28c/0x4b0 [xe]
    [ 191.738966] ? kmemleak_alloc+0x4b/0x80
    [ 191.738973] ops_execute+0x188/0x9d0 [xe]
    [ 191.739036] xe_vm_rebind+0x4ce/0x5a0 [xe]
    [ 191.739098] ? trace_hardirqs_on+0x4d/0x60
    [ 191.739112] preempt_rebind_work_func+0x76f/0xd00 [xe]

[ Fix ]

* upstream fix :
6b93cb98910c drm/xe/userptr: fix EFAULT handling

[ Test Plan ]

 * Compiled.

[ Where problems could occur ]

 * Regression in error handling mechanism in BMG driver.

[ Other Info ]

 * Pointed by intel as missing.

Matthew Auld (1):
  drm/xe/userptr: fix EFAULT handling

 drivers/gpu/drm/xe/xe_vm.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

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2.45.2