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| author | Dan Williams <dan.j.williams@intel.com> | 2023-10-05 01:49:36 +0200 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2023-10-06 09:12:45 +0200 |
| commit | 5f2da19714465739da2449253b13ac06cb353a26 (patch) | |
| tree | 568c28c18143412f819fe47d6a3513084a7f5f93 /drivers/cxl/cxlmem.h | |
| parent | cxl/pci: Clarify devm host for memdev relative setup (diff) | |
| download | linux-5f2da19714465739da2449253b13ac06cb353a26.tar.xz linux-5f2da19714465739da2449253b13ac06cb353a26.zip | |
cxl/pci: Fix sanitize notifier setup
Fix a race condition between the mailbox-background command interrupt
firing and the security-state sysfs attribute being removed.
The race is difficult to see due to the awkward placement of the
sanitize-notifier setup code and the multiple places the teardown calls
are made, cxl_memdev_security_init() and cxl_memdev_security_shutdown().
Unify setup in one place, cxl_sanitize_setup_notifier(). Arrange for
the paired cxl_sanitize_teardown_notifier() to safely quiet the notifier
and let the cxl_memdev + irq be unregistered later in the flow.
Note: The special wrinkle of the sanitize notifier is that it interacts
with interrupts, which are enabled early in the flow, and it interacts
with memdev sysfs which is not initialized until late in the flow. Hence
why this setup routine takes an @cxlmd argument, and not just @mds.
This fix is also needed as a preparation fix for a memdev unregistration
crash.
Reported-by: Jonathan Cameron <Jonathan.Cameron@Huawei.com>
Closes: http://lore.kernel.org/r/20230929100316.00004546@Huawei.com
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Fixes: 0c36b6ad436a ("cxl/mbox: Add sanitization handling machinery")
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Reviewed-by: Davidlohr Bueso <dave@stgolabs.net>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/cxl/cxlmem.h')
| -rw-r--r-- | drivers/cxl/cxlmem.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index fdb2c8dd98d0..fbdee1d63717 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -86,6 +86,8 @@ static inline bool is_cxl_endpoint(struct cxl_port *port) struct cxl_memdev *devm_cxl_add_memdev(struct device *host, struct cxl_dev_state *cxlds); +int devm_cxl_sanitize_setup_notifier(struct device *host, + struct cxl_memdev *cxlmd); struct cxl_memdev_state; int devm_cxl_setup_fw_upload(struct device *host, struct cxl_memdev_state *mds); int devm_cxl_dpa_reserve(struct cxl_endpoint_decoder *cxled, |