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| author |   Sean Paul <seanpaul@chromium.org> | 2017-05-18 09:24:30 -0400 |
|---|---|---|
| committer | Sean Paul <seanpaul@chromium.org> | 2017-05-18 09:24:30 -0400 |
| commit | 6b7781b42dc9bc9bcd1523b6c24b876cdda0bef3 (patch) | |
| tree | ee55c67e4ea30b9eb44f301ba0bde2e631a26162 /drivers/misc/cxl/file.c | |
| parent | drm/sti:fix spelling mistake: "compoment" -> "component" (diff) | |
| parent | Merge tag 'drm-misc-next-2017-05-16' of git://anongit.freedesktop.org/git/drm-misc into drm-next (diff) | |
| download | linux-dev-6b7781b42dc9bc9bcd1523b6c24b876cdda0bef3.tar.xz linux-dev-6b7781b42dc9bc9bcd1523b6c24b876cdda0bef3.zip | |
Merge remote-tracking branch 'airlied/drm-next' into drm-misc-next
Picking up drm-next @ 4.12-rc1 in order to apply Michal Hocko's vmalloc patch set
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Diffstat (limited to 'drivers/misc/cxl/file.c')
| -rw-r--r-- | drivers/misc/cxl/file.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/misc/cxl/file.c b/drivers/misc/cxl/file.c index e7139c76f961..17b433f1ce23 100644 --- a/drivers/misc/cxl/file.c +++ b/drivers/misc/cxl/file.c @@ -18,6 +18,7 @@ #include <linux/fs.h> #include <linux/mm.h> #include <linux/slab.h> +#include <linux/sched/mm.h> #include <asm/cputable.h> #include <asm/current.h> #include <asm/copro.h> @@ -216,8 +217,16 @@ static long afu_ioctl_start_work(struct cxl_context *ctx, * process is still accessible. */ ctx->pid = get_task_pid(current, PIDTYPE_PID); - ctx->glpid = get_task_pid(current->group_leader, PIDTYPE_PID); + /* acquire a reference to the task's mm */ + ctx->mm = get_task_mm(current); + + /* ensure this mm_struct can't be freed */ + cxl_context_mm_count_get(ctx); + + /* decrement the use count */ + if (ctx->mm) + mmput(ctx->mm); trace_cxl_attach(ctx, work.work_element_descriptor, work.num_interrupts, amr); @@ -225,9 +234,9 @@ static long afu_ioctl_start_work(struct cxl_context *ctx, amr))) { afu_release_irqs(ctx, ctx); cxl_adapter_context_put(ctx->afu->adapter); - put_pid(ctx->glpid); put_pid(ctx->pid); - ctx->glpid = ctx->pid = NULL; + ctx->pid = NULL; + cxl_context_mm_count_put(ctx); goto out; } |