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um: ubd: Fix for processes stuck in D state forever
Starting with Linux 3.12 processes get stuck in D state forever in UserModeLinux under sync heavy workloads. This bug was introduced by commit805f11a0d5
(um: ubd: Add REQ_FLUSH suppport). Fix bug by adding a check if FLUSH request was successfully submitted to the I/O thread and keeping the FLUSH request on the request queue on submission failures. Fixes:805f11a0d5
(um: ubd: Add REQ_FLUSH suppport) Signed-off-by: Thorsten Knabe <linux@thorsten-knabe.de> Cc: stable@kernel.org # >= 3.12 Signed-off-by: Richard Weinberger <richard@nod.at>
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commit
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1 changed files with 3 additions and 2 deletions
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@ -1277,7 +1277,7 @@ static void do_ubd_request(struct request_queue *q)
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while(1){
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struct ubd *dev = q->queuedata;
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if(dev->end_sg == 0){
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if(dev->request == NULL){
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struct request *req = blk_fetch_request(q);
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if(req == NULL)
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return;
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@ -1299,7 +1299,8 @@ static void do_ubd_request(struct request_queue *q)
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return;
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}
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prepare_flush_request(req, io_req);
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submit_request(io_req, dev);
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if (submit_request(io_req, dev) == false)
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return;
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}
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while(dev->start_sg < dev->end_sg){
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