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| author | Vijay Viswanath <vviswana@codeaurora.org> | 2018-05-03 13:07:22 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-05-18 18:22:47 +0200 |
| commit | 10e5e37581fc5817d52ff5f8e2b3362f64eb04f4 (patch) | |
| tree | 0cd3a08994ad1f1b8ded13e502fd93a4475205f6 /drivers/scsi/qlogicpti.c | |
| parent | scsi: ufs: make sure all interrupts are processed (diff) | |
| download | linux-10e5e37581fc5817d52ff5f8e2b3362f64eb04f4.tar.xz linux-10e5e37581fc5817d52ff5f8e2b3362f64eb04f4.zip | |
scsi: ufs: Add clock ungating to a separate workqueue
UFS driver can receive a request during memory reclaim by kswapd. So
when ufs driver puts the ungate work in queue, and if there are no idle
workers, kthreadd is invoked to create a new kworker. Since kswapd task
holds a mutex which kthreadd also needs, this can cause a deadlock
situation. So ungate work must be done in a separate work queue with
WQ_MEM_RECLAIM flag enabled. Such a workqueue will have a rescue thread
which will be called when the above deadlock condition is possible.
Signed-off-by: Vijay Viswanath <vviswana@codeaurora.org>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Reviewed-by: Subhash Jadavani <subhashj@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/qlogicpti.c')
0 files changed, 0 insertions, 0 deletions