https://www.emblogic.com/forum/categories/009-01-introduction-to-device-drivers/p2/feed.rss Tue, 22 Sep 26 14:34:59 -0400 Interview Questions: Chacacter Device Drivers Development - EmbLogic en-CA https://www.emblogic.com/forum/discussion/2358/005-07-132-why-combine-trace_printk-with-ftrace-while-debugging-driver-io-operations Tue, 16 Jun 2026 17:28:57 -0400 pravjot 2358@/forum/discussions https://www.emblogic.com/forum/discussion/2357/005-07-131-how-does-function_graph-tracing-help-analyze-character-driver-execution-flow Tue, 16 Jun 2026 17:27:53 -0400 pravjot 2357@/forum/discussions https://www.emblogic.com/forum/discussion/2356/005-07-130-how-does-function_graph-help-identify-latency-and-call-flow-in-a-character-driver Tue, 16 Jun 2026 17:24:24 -0400 pravjot 2356@/forum/discussions https://www.emblogic.com/forum/discussion/2355/005-07-129-how-does-ftrace-trace-character-driver-functions-without-modifying-driver-source-code Tue, 16 Jun 2026 17:23:06 -0400 pravjot 2355@/forum/discussions https://www.emblogic.com/forum/discussion/2354/005-07-128-why-is-debugfs_remove_recursive-required-during-driver-cleanup Tue, 16 Jun 2026 17:17:48 -0400 pravjot 2354@/forum/discussions https://www.emblogic.com/forum/discussion/2353/005-07-127-how-do-you-create-and-expose-driver-variables-using-debugfs Tue, 16 Jun 2026 17:16:42 -0400 pravjot 2353@/forum/discussions https://www.emblogic.com/forum/discussion/2352/005-07-126-why-must-a-driver-call-debugfs_remove_recursive-during-module-unload Tue, 16 Jun 2026 17:06:48 -0400 pravjot 2352@/forum/discussions https://www.emblogic.com/forum/discussion/2351/005-07-125-why-is-debugfs-useful-for-inspecting-live-driver-variables-during-runtime Tue, 16 Jun 2026 17:05:41 -0400 pravjot 2351@/forum/discussions https://www.emblogic.com/forum/discussion/2350/005-07-124-what-is-the-purpose-of-using-pmfl-in-dynamic-debug-control-commands Tue, 16 Jun 2026 16:31:52 -0400 pravjot 2350@/forum/discussions https://www.emblogic.com/forum/discussion/2349/005-07-123-how-does-dynamic-debug-enable-pr_debug-and-dev_dbg-logs-at-runtime Tue, 16 Jun 2026 16:30:54 -0400 pravjot 2349@/forum/discussions https://www.emblogic.com/forum/discussion/2348/005-07-122-why-can-excessive-logging-in-read-write-or-interrupt-handlers-cause-a-print-storm Tue, 16 Jun 2026 16:22:32 -0400 pravjot 2348@/forum/discussions https://www.emblogic.com/forum/discussion/2347/005-07-121-how-does-dmesg-help-debug-pr_-and-dev_-logs-from-a-character-driver Tue, 16 Jun 2026 16:21:18 -0400 pravjot 2347@/forum/discussions https://www.emblogic.com/forum/discussion/2346/005-07-120-when-should-a-driver-use-dev_err_probe-during-device-initialization Tue, 16 Jun 2026 16:14:32 -0400 pravjot 2346@/forum/discussions https://www.emblogic.com/forum/discussion/2345/005-07-119-why-are-dev_-macros-preferred-over-pr_-macros-for-device-specific-logging Tue, 16 Jun 2026 16:06:01 -0400 pravjot 2345@/forum/discussions https://www.emblogic.com/forum/discussion/2344/005-07-018-when-should-a-driver-use-pr_err-pr_warn-and-pr_debug Tue, 16 Jun 2026 16:01:35 -0400 pravjot 2344@/forum/discussions https://www.emblogic.com/forum/discussion/2343/005-07-117-why-should-device-drivers-use-pr_-macros-instead-of-direct-printk-calls Tue, 16 Jun 2026 15:59:27 -0400 pravjot 2343@/forum/discussions https://www.emblogic.com/forum/discussion/2342/005-06-116-how-does-llseek-calculate-and-validate-the-new-f_pos-in-a-character-device-driver Tue, 16 Jun 2026 09:23:01 -0400 pravjot 2342@/forum/discussions https://www.emblogic.com/forum/discussion/2341/005-06-115-how-does-llseek-validate-and-update-f_pos-in-a-character-device-driver Tue, 16 Jun 2026 09:21:06 -0400 pravjot 2341@/forum/discussions https://www.emblogic.com/forum/discussion/2340/005-06-114-how-does-readdevice-safely-handle-eof-fragmented-scull-memory-and-copy_to_user Tue, 16 Jun 2026 09:18:30 -0400 pravjot 2340@/forum/discussions https://www.emblogic.com/forum/discussion/2339/005-06-113-how-does-a-character-driver-safely-read-data-from-fragmented-kernel-memory-into-user-spc Tue, 16 Jun 2026 09:15:04 -0400 pravjot 2339@/forum/discussions https://www.emblogic.com/forum/discussion/2338/005-06-112-how-does-a-driver-handle-eof-and-partial-reads-using-f_pos Tue, 16 Jun 2026 09:07:51 -0400 pravjot 2338@/forum/discussions https://www.emblogic.com/forum/discussion/2337/005-06-111-why-must-a-character-driver-use-copy_to_user-during-read-operations Tue, 16 Jun 2026 09:06:47 -0400 pravjot 2337@/forum/discussions https://www.emblogic.com/forum/discussion/2336/005-06-110-why-must-character-driver-use-copy_from_user-instead-of-memcpy-during-write Tue, 16 Jun 2026 09:04:36 -0400 pravjot 2336@/forum/discussions https://www.emblogic.com/forum/discussion/2335/005-06-109-how-does-a-scull-write-routine-map-f_pos-to-the-correct-qset-quantum-and-byte-offset Tue, 16 Jun 2026 09:02:45 -0400 pravjot 2335@/forum/discussions https://www.emblogic.com/forum/discussion/2334/005-06-108-why-does-scull-perform-partial-writes-when-data-crosses-a-quantum-boundary Tue, 16 Jun 2026 08:57:25 -0400 pravjot 2334@/forum/discussions https://www.emblogic.com/forum/discussion/2333/005-06-107-how-does-a-scull-driver-map-f_pos-to-the-correct-position-in-scull Tue, 16 Jun 2026 08:56:11 -0400 pravjot 2333@/forum/discussions https://www.emblogic.com/forum/discussion/2332/005-06-106-how-does-scull-use-qsets-pointer-arrays-quantums-to-solve-kernel-memory-fragmentation Tue, 16 Jun 2026 08:52:49 -0400 pravjot 2332@/forum/discussions https://www.emblogic.com/forum/discussion/2331/005-06-105-how-does-release-use-private_data-and-iminor-to-clean-up-a-character-device-session Tue, 16 Jun 2026 04:22:30 -0400 pravjot 2331@/forum/discussions https://www.emblogic.com/forum/discussion/2330/005-06-104-why-is-a-character-driver039s-release-function-invoked-only-when-f_count-becomes-zero Tue, 16 Jun 2026 04:20:26 -0400 pravjot 2330@/forum/discussions https://www.emblogic.com/forum/discussion/2329/005-06-103-how-does-container_of-retrieve-the-parent-dev-structure-from-inode-i_cdev Tue, 16 Jun 2026 04:17:48 -0400 pravjot 2329@/forum/discussions https://www.emblogic.com/forum/discussion/2328/005-06-102-when-should-a-driver-return-ebusy-from-its-open-routine Tue, 16 Jun 2026 04:14:48 -0400 pravjot 2328@/forum/discussions https://www.emblogic.com/forum/discussion/2327/005-06-101-why-is-filep-private_data-initialized-during-open Tue, 16 Jun 2026 04:13:04 -0400 pravjot 2327@/forum/discussions https://www.emblogic.com/forum/discussion/2326/005-06-100-what-key-tasks-should-a-character-driver039s-open-routine-perform Tue, 16 Jun 2026 04:11:23 -0400 pravjot 2326@/forum/discussions https://www.emblogic.com/forum/discussion/2325/005-06-099-how-does-filep-private_data-help-preserve-device-specific-context-across-driver-operati Tue, 16 Jun 2026 03:57:26 -0400 pravjot 2325@/forum/discussions https://www.emblogic.com/forum/discussion/2324/005-06-098-why-is-container_of-used-in-the-open-routine-of-a-character-driver Tue, 16 Jun 2026 03:56:26 -0400 pravjot 2324@/forum/discussions https://www.emblogic.com/forum/discussion/2323/005-06-097-why-does-the-vfs-copy-file_operations-into-filep-f_op-during-open Tue, 16 Jun 2026 03:53:58 -0400 pravjot 2323@/forum/discussions https://www.emblogic.com/forum/discussion/2322/005-06-096-what-is-the-role-of-major-and-minor-numbers-in-managing-multiple-character-devices Tue, 16 Jun 2026 03:51:45 -0400 pravjot 2322@/forum/discussions https://www.emblogic.com/forum/discussion/2320/005-06-095-how-does-dev_t-help-the-vfs-route-a-character-device-file-to-the-correct-driver Tue, 16 Jun 2026 03:48:36 -0400 pravjot 2320@/forum/discussions https://www.emblogic.com/forum/discussion/2319/005-06-094-how-does-the-vfs-identify-devmychardriver0-as-a-character-device-and-route-control- Tue, 16 Jun 2026 03:44:27 -0400 pravjot 2319@/forum/discussions https://www.emblogic.com/forum/discussion/2318/005-05-93-sysfs-permission-matrix-hardening-runtime-write-failures-safe-bounded-array-iteration Tue, 16 Jun 2026 01:30:12 -0400 pravjot 2318@/forum/discussions https://www.emblogic.com/forum/discussion/2317/005-05-92-sysfs-permission-matrix-hardening-runtime-write-failures-safe-bounded-array-iteration Tue, 16 Jun 2026 01:27:53 -0400 pravjot 2317@/forum/discussions https://www.emblogic.com/forum/discussion/2316/005-05-91-sysfs-parameter-mapping-runtime-overwrite-hazards-and-race-conditions-in-multi-threaded Tue, 16 Jun 2026 01:22:34 -0400 pravjot 2316@/forum/discussions https://www.emblogic.com/forum/discussion/2315/005-05-90-sysfs-parameter-mapping-runtime-overwrite-hazards-and-race-conditions-in-multi-threaded Tue, 16 Jun 2026 01:19:37 -0400 pravjot 2315@/forum/discussions https://www.emblogic.com/forum/discussion/2314/005-05-089-sysfs-storefront-registration-topological-device-trees-and-core-cascading-rollbacks Tue, 16 Jun 2026 01:09:52 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https://www.emblogic.com/forum/discussion/2309/005-05-084-inode-level-dev_t-extraction-cdev_map-lookup-mechanics-and-minor-number-multiplexing Tue, 16 Jun 2026 00:46:53 -0400 pravjot 2309@/forum/discussions https://www.emblogic.com/forum/discussion/2308/005-05-083-inode-level-dev_t-extraction-cdev_map-lookup-mechanics-and-minor-number-multiplexing Mon, 15 Jun 2026 18:28:22 -0400 pravjot 2308@/forum/discussions https://www.emblogic.com/forum/discussion/2307/005-05-082composite-object-linkingmodule-postprocessingmodpostout-of-tree-crosskbuild-mechanics Mon, 15 Jun 2026 17:53:27 -0400 pravjot 2307@/forum/discussions https://www.emblogic.com/forum/discussion/2306/005-05-081composite-object-linkingmodule-postprocessingmodpostout-of-tree-crosskbuild-mechanics Mon, 15 Jun 2026 17:50:43 -0400 pravjot 2306@/forum/discussions https://www.emblogic.com/forum/discussion/2305/005-05-080composite-object-linkingmodule-postprocessingmodpostout-of-tree-crosskbuild-mechanics Mon, 15 Jun 2026 17:45:50 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Jun 2026 13:30:57 -0400 pravjot 2300@/forum/discussions https://www.emblogic.com/forum/discussion/2299/005-04-074-atomic-reference-counters-blocked-module-unloading-kernel-ring-buffer-eviction Mon, 15 Jun 2026 13:28:48 -0400 pravjot 2299@/forum/discussions https://www.emblogic.com/forum/discussion/2298/005-04-073-module-lifecycle-overheads-memory-reclamation-and-linker-segment-dropping Mon, 15 Jun 2026 13:09:28 -0400 pravjot 2298@/forum/discussions https://www.emblogic.com/forum/discussion/2297/005-04-072-module-lifecycle-overheads-memory-reclamation-and-linker-segment-dropping Mon, 15 Jun 2026 13:08:01 -0400 pravjot 2297@/forum/discussions https://www.emblogic.com/forum/discussion/2296/005-04-071kbuild-lifecycle-transitiontristate-binding-mechanicscrosscompilation-toolchain-mismach Mon, 15 Jun 2026 13:01:38 -0400 pravjot 2296@/forum/discussions 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2286@/forum/discussions https://www.emblogic.com/forum/discussion/2285/005-04-060-module-reference-counting-asynchronous-release-pitfalls-and-delete_module-architecture Mon, 15 Jun 2026 01:16:09 -0400 pravjot 2285@/forum/discussions https://www.emblogic.com/forum/discussion/2284/005-04-059-module-reference-counting-asynchronous-release-pitfalls-and-delete_module-architecture Mon, 15 Jun 2026 01:13:38 -0400 pravjot 2284@/forum/discussions https://www.emblogic.com/forum/discussion/2283/005-04-058-system-call-execution-contexts-page-allocation-constraints-and-partial-initialization Mon, 15 Jun 2026 01:09:48 -0400 pravjot 2283@/forum/discussions https://www.emblogic.com/forum/discussion/2282/005-04-057-system-call-execution-contexts-page-allocation-constraints-and-partial-initialization Mon, 15 Jun 2026 01:07:54 -0400 pravjot 2282@/forum/discussions 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