kernel/linux.git/drivers/hwtracing/intel_th, branch v6.6.148

intel_th: fix MSC output device reference leak

2026-08-03T09:15:28+00:00

commit 761b785a0cfbce43761227bc42a7f984f31f8921 upstream. intel_th_output_open() looks up the output device with bus_find_device_by_devt(), which returns the device with a reference that must be dropped after use. commit 95fc36a234da ("intel_th: fix device leak on output open()") attempted to drop the reference from intel_th_output_release(). However, a successful open replaces file->f_op with the output driver file operations before returning, so close runs the output driver release callback instead. For MSC outputs, close runs intel_th_msc_release(), which only removes the per-file iterator and does not drop the device reference taken by intel_th_output_open(). Consequently, every successful MSC output open leaks one device reference. Drop the device reference from intel_th_msc_release(), which is the release path actually used for MSC output files. Remove the now-unused intel_th_output_release() callback from intel_th_output_fops. Fixes: 95fc36a234da ("intel_th: fix device leak on output open()") Cc: stable Signed-off-by: Guangshuo Li Reviewed-by: Johan Hovold Link: https://patch.msgid.link/20260715070851.2077965-1-lgs201920130244@gmail.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Greg Kroah-Hartman

intel_th: fix device leak on output open()

2026-01-30T09:27:39+00:00

commit 95fc36a234da24bbc5f476f8104a5a15f99ed3e3 upstream. Make sure to drop the reference taken when looking up the th device during output device open() on errors and on close(). Note that a recent commit fixed the leak in a couple of open() error paths but not all of them, and the reference is still leaking on successful open(). Fixes: 39f4034693b7 ("intel_th: Add driver infrastructure for Intel(R) Trace Hub devices") Fixes: 6d5925b667e4 ("intel_th: Fix error handling in intel_th_output_open") Cc: stable@vger.kernel.org # 4.4: 6d5925b667e4 Cc: Alexander Shishkin Cc: Ma Ke Signed-off-by: Johan Hovold Link: https://patch.msgid.link/20251208153524.68637-2-johan@kernel.org Signed-off-by: Greg Kroah-Hartman

intel_th: Fix error handling in intel_th_output_open

2026-01-11T14:21:58+00:00

commit 6d5925b667e4ed9e77c8278cc215191d29454a3f upstream. intel_th_output_open() calls bus_find_device_by_devt() which internally increments the device reference count via get_device(), but this reference is not properly released in several error paths. When device driver is unavailable, file operations cannot be obtained, or the driver's open method fails, the function returns without calling put_device(), leading to a permanent device reference count leak. This prevents the device from being properly released and could cause resource exhaustion over time. Found by code review. Cc: stable Fixes: 39f4034693b7 ("intel_th: Add driver infrastructure for Intel(R) Trace Hub devices") Signed-off-by: Ma Ke Link: https://patch.msgid.link/20251112091723.35963-1-make24@iscas.ac.cn Signed-off-by: Greg Kroah-Hartman

intel_th: avoid using deprecated page->mapping, index fields

2025-06-04T12:41:52+00:00

[ Upstream commit 8e553520596bbd5ce832e26e9d721e6a0c797b8b ] The struct page->mapping, index fields are deprecated and soon to be only available as part of a folio. It is likely the intel_th code which sets page->mapping, index is was implemented out of concern that some aspect of the page fault logic may encounter unexpected problems should they not. However, the appropriate interface for inserting kernel-allocated memory is vm_insert_page() in a VM_MIXEDMAP. By using the helper function vmf_insert_mixed() we can do this with minimal churn in the existing fault handler. By doing so, we bypass the remainder of the faulting logic. The pages are still pinned so there is no possibility of anything unexpected being done with the pages once established. It would also be reasonable to pre-map everything on fault, however to minimise churn we retain the fault handler. We also eliminate all code which clears page->mapping on teardown as this has now become unnecessary. The MSU code relies on faulting to function correctly, so is by definition dependent on CONFIG_MMU. We avoid spurious reports about compilation failure for unsupported platforms by making this requirement explicit in Kconfig as part of this change too. Signed-off-by: Lorenzo Stoakes Acked-by: Alexander Shishkin Link: https://lore.kernel.org/r/20250331125608.60300-1-lorenzo.stoakes@oracle.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin

intel_th: pci: Add Panther Lake-P/U support

2025-03-13T11:58:36+00:00

commit 49114ff05770264ae233f50023fc64a719a9dcf9 upstream. Add support for the Trace Hub in Panther Lake-P/U. Signed-off-by: Alexander Shishkin Reviewed-by: Andy Shevchenko Cc: stable@kernel.org Link: https://lore.kernel.org/r/20250211185017.1759193-6-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman

intel_th: pci: Add Panther Lake-H support

2025-03-13T11:58:36+00:00

commit a70034d6c0d5f3cdee40bb00a578e17fd2ebe426 upstream. Add support for the Trace Hub in Panther Lake-H. Signed-off-by: Alexander Shishkin Reviewed-by: Andy Shevchenko Cc: stable@kernel.org Link: https://lore.kernel.org/r/20250211185017.1759193-5-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman

intel_th: pci: Add Arrow Lake support

2025-03-13T11:58:36+00:00

commit b5edccae9f447a92d475267d94c33f4926963eec upstream. Add support for the Trace Hub in Arrow Lake. Signed-off-by: Pawel Chmielewski Signed-off-by: Alexander Shishkin Reviewed-by: Andy Shevchenko Cc: stable@kernel.org Link: https://lore.kernel.org/r/20250211185017.1759193-4-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman

intel_th: pci: Add Lunar Lake support

2024-06-21T12:38:43+00:00

commit f866b65322bfbc8fcca13c25f49e1a5c5a93ae4d upstream. Add support for the Trace Hub in Lunar Lake. Signed-off-by: Alexander Shishkin Reviewed-by: Andy Shevchenko Cc: stable@kernel.org Link: https://lore.kernel.org/r/20240429130119.1518073-16-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman

intel_th: pci: Add Meteor Lake-S support

2024-06-21T12:38:43+00:00

commit c4a30def564d75e84718b059d1a62cc79b137cf9 upstream. Add support for the Trace Hub in Meteor Lake-S. Signed-off-by: Alexander Shishkin Reviewed-by: Andy Shevchenko Cc: stable@kernel.org Link: https://lore.kernel.org/r/20240429130119.1518073-14-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman

intel_th: pci: Add Sapphire Rapids SOC support

2024-06-21T12:38:43+00:00

commit 2e1da7efabe05cb0cf0b358883b2bc89080ed0eb upstream. Add support for the Trace Hub in Sapphire Rapids SOC. Signed-off-by: Alexander Shishkin Reviewed-by: Andy Shevchenko Cc: stable@kernel.org Link: https://lore.kernel.org/r/20240429130119.1518073-13-alexander.shishkin@linux.intel.com Signed-off-by: Greg Kroah-Hartman