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A mirror of the official Linux kernel repository just in case
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The current IRQ handler blocks SCSI requests before scheduling eh_work, when error handler calls pm_runtime_get_sync, if ufshcd_suspend/resume sends a SCSI cmd, most likely the SSU cmd, since SCSI requests are blocked, pm_runtime_get_sync() will never return because ufshcd_suspend/resume is blocked by the SCSI cmd. - In queuecommand path, hba->ufshcd_state check and ufshcd_send_command should stay under the same spin lock. This is to make sure that no more commands leak into doorbell after hba->ufshcd_state is changed. - Don't block SCSI requests before error handler starts to run, let error handler block SCSI requests when it is ready to start error recovery. - Don't let SCSI layer keep requeuing the SCSI cmds sent from HBA runtime PM ops, let them pass or fail them. Let them pass if eh_work is scheduled due to non-fatal errors. Fail them if eh_work is scheduled due to fatal errors, otherwise the cmds may eventually time out since UFS is in bad state, which gets error handler blocked for too long. If we fail the SCSI cmds sent from HBA runtime PM ops, HBA runtime PM ops fails too, but it does not hurt since error handler can recover HBA runtime PM error. Link: https://lore.kernel.org/r/1596975355-39813-9-git-send-email-cang@codeaurora.org Reviewed-by: Bean Huo <beanhuo@micron.com> Reviewed-by: Asutosh Das <asutoshd@codeaurora.org> Signed-off-by: Can Guo <cang@codeaurora.org> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com> |
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| fs | ||
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| kernel | ||
| lib | ||
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| net | ||
| samples | ||
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| usr | ||
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| .clang-format | ||
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| .get_maintainer.ignore | ||
| .gitattributes | ||
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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.