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cxl/memdev: Hold memdev lock during memdev poison injection/clear

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cxl_dpa_to_region() assumes that it is running a context where it is not
racing changes to "cxlmd->dev.driver". Acquire the memdev device lock in
the debugfs entry points to preclude debugfs usage racing cxl_mem driver
detach.

Suggested-by: Dan Williams <djbw@kernel.org>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Alison Schofield <alison.schofield@intel.com>
Reviewed-by: Dan Williams <djbw@kernel.org>
Signed-off-by: Li Ming <ming.li@zohomail.com>
Link: https://patch.msgid.link/20260423111949.177399-1-ming.li@zohomail.com
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
This commit is contained in:
Li Ming 2026-04-23 19:19:49 +08:00 committed by Dave Jiang
parent e43ffb69e0
commit 574eda81d0
1 changed files with 10 additions and 0 deletions
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10
drivers/cxl/mem.c
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@ -48,6 +48,11 @@ static int cxl_mem_dpa_show(struct seq_file *file, void *data)
static int cxl_debugfs_poison_inject(void *data, u64 dpa)
{
struct cxl_memdev *cxlmd = data;
int rc;
ACQUIRE(device_intr, devlock)(&cxlmd->dev);
if ((rc = ACQUIRE_ERR(device_intr, &devlock)))
return rc;
return cxl_inject_poison(cxlmd, dpa);
}
@ -58,6 +63,11 @@ DEFINE_DEBUGFS_ATTRIBUTE(cxl_poison_inject_fops, NULL,
static int cxl_debugfs_poison_clear(void *data, u64 dpa)
{
struct cxl_memdev *cxlmd = data;
int rc;
ACQUIRE(device_intr, devlock)(&cxlmd->dev);
if ((rc = ACQUIRE_ERR(device_intr, &devlock)))
return rc;
return cxl_clear_poison(cxlmd, dpa);
}