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| author |   Vaibhav Jain <vaibhav@linux.vnet.ibm.com> | 2017-11-24 14:03:38 +0530 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2017-11-29 19:56:18 +1100 |
| commit | 7e4d4233260be0611c7fbdb2730c12731c4b8dc0 (patch) | |
| tree | 52eab6d31594903d88d7dd68f547d16bf873106c /arch | |
| parent | powerpc: Avoid signed to unsigned conversion in set_thread_tidr() (diff) | |
| download | linux-dev-7e4d4233260be0611c7fbdb2730c12731c4b8dc0.tar.xz linux-dev-7e4d4233260be0611c7fbdb2730c12731c4b8dc0.zip | |
powerpc: Do not assign thread.tidr if already assigned
If set_thread_tidr() is called twice for same task_struct then it will
allocate a new tidr value to it leaving the previous value still
dangling in the vas_thread_ida table.
To fix this the patch changes set_thread_tidr() to check if a tidr
value is already assigned to the task_struct and if yes then returns
zero.
Fixes: ec233ede4c86("powerpc: Add support for setting SPRN_TIDR")
Signed-off-by: Vaibhav Jain <vaibhav@linux.vnet.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
[mpe: Modify to return 0 in the success case, not the TID value]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index d205b52e3850..5acb5a176dbe 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1577,6 +1577,9 @@ int set_thread_tidr(struct task_struct *t) if (t != current) return -EINVAL; + if (t->thread.tidr) + return 0; + rc = assign_thread_tidr(); if (rc < 0) return rc; |