Date: Tue, 13 Mar 2018 16:33:41 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r330865 - stable/11/sys/compat/linuxkpi/common/src Message-ID: <201803131633.w2DGXfA5010572@repo.freebsd.org>
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Author: hselasky Date: Tue Mar 13 16:33:41 2018 New Revision: 330865 URL: https://svnweb.freebsd.org/changeset/base/330865 Log: MFC r330689: Implement proper support for complete_all() in the LinuxKPI. When complete_all() is called there might be multiple waiters. The current implementation could only handle one waiter. Make sure the completion is sticky when complete_all() is called to be compatible with Linux. Found by: Johannes Lundberg <johalun0@gmail.com> Sponsored by: Mellanox Technologies Sponsored by: Limelight Networks Modified: stable/11/sys/compat/linuxkpi/common/src/linux_compat.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/compat/linuxkpi/common/src/linux_compat.c ============================================================================== --- stable/11/sys/compat/linuxkpi/common/src/linux_compat.c Tue Mar 13 16:33:00 2018 (r330864) +++ stable/11/sys/compat/linuxkpi/common/src/linux_compat.c Tue Mar 13 16:33:41 2018 (r330865) @@ -1779,11 +1779,14 @@ linux_complete_common(struct completion *c, int all) int wakeup_swapper; sleepq_lock(c); - c->done++; - if (all) + if (all) { + c->done = UINT_MAX; wakeup_swapper = sleepq_broadcast(c, SLEEPQ_SLEEP, 0, 0); - else + } else { + if (c->done != UINT_MAX) + c->done++; wakeup_swapper = sleepq_signal(c, SLEEPQ_SLEEP, 0, 0); + } sleepq_release(c); if (wakeup_swapper) kick_proc0(); @@ -1825,7 +1828,8 @@ linux_wait_for_common(struct completion *c, int flags) } else sleepq_wait(c, 0); } - c->done--; + if (c->done != UINT_MAX) + c->done--; sleepq_release(c); intr: @@ -1878,7 +1882,8 @@ linux_wait_for_timeout_common(struct completion *c, in goto done; } } - c->done--; + if (c->done != UINT_MAX) + c->done--; sleepq_release(c); /* return how many jiffies are left */ @@ -1894,12 +1899,10 @@ linux_try_wait_for_completion(struct completion *c) { int isdone; - isdone = 1; sleepq_lock(c); - if (c->done) + isdone = (c->done != 0); + if (c->done != 0 && c->done != UINT_MAX) c->done--; - else - isdone = 0; sleepq_release(c); return (isdone); } @@ -1909,10 +1912,8 @@ linux_completion_done(struct completion *c) { int isdone; - isdone = 1; sleepq_lock(c); - if (c->done == 0) - isdone = 0; + isdone = (c->done != 0); sleepq_release(c); return (isdone); }
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