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A mirror of the official Linux kernel repository just in case
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A NCQ error means that the device has aborted processing of all active commands. To get the single NCQ command that caused the NCQ error, host software has to read the NCQ error log, which also takes the device out of error state. When the device encounters a NCQ error, we receive an error interrupt from the HBA, and call ata_do_link_abort() to mark all outstanding commands on the link as ATA_QCFLAG_FAILED (which means that these commands are owned by libata EH), and then call ata_qc_complete() on them. ata_qc_complete() will call fill_result_tf() for all commands marked as ATA_QCFLAG_FAILED. The taskfile is simply the latest status/error as seen from the device's perspective. The taskfile will have ATA_ERR set in the status field and ATA_ABORTED set in the error field. When we fill the current taskfile values for all outstanding commands, that means that qc->result_tf will have ATA_ERR set for all commands owned by libata EH. When ata_eh_link_autopsy() later analyzes all commands owned by libata EH, it will call ata_eh_analyze_tf(), which will check if qc->result_tf has ATA_ERR set, if it does, it will set qc->err_mask (which marks the command as an error). When ata_eh_finish() later calls __ata_qc_complete() on all commands owned by libata EH, it will call qc->complete_fn() (ata_scsi_qc_complete()), ata_scsi_qc_complete() will call ata_gen_ata_sense() to generate sense data if qc->err_mask is set. This means that we will generate sense data for commands that should not have any sense data set. Having sense data set for the non-failed commands will cause SCSI to finish these commands instead of retrying them. While this incorrect behavior has existed for a long time, this first became a problem once we started reading the correct taskfile register in commit |
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| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
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| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
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| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
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| Kbuild | ||
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| MAINTAINERS | ||
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| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.