UPSTREAM: fork: fix pidfd_poll()'s return type
pidfd_poll() is defined as returning 'unsigned int' but the .poll method is declared as returning '__poll_t', a bitwise type. Fix this by using the proper return type and using the EPOLL constants instead of the POLL ones, as required for __poll_t. Fixes: b53b0b9d9a61 ("pidfd: add polling support") Cc: Joel Fernandes (Google) <joel@joelfernandes.org> Cc: stable@vger.kernel.org # 5.3 Signed-off-by: Luc Van Oostenryck <luc.vanoostenryck@gmail.com> Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/r/20191120003320.31138-1-luc.vanoostenryck@gmail.com Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com> (cherry picked from commit 9e77716a75bc6cf54965e5ec069ba7c02b32251c) Signed-off-by: Greg Kroah-Hartman <gregkh@google.com> Change-Id: I4cb4824929500d28f8f3165289a59eb4122e04ab
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1 changed files with 3 additions and 3 deletions
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@ -1685,11 +1685,11 @@ static void pidfd_show_fdinfo(struct seq_file *m, struct file *f)
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/*
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* Poll support for process exit notification.
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*/
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static unsigned int pidfd_poll(struct file *file, struct poll_table_struct *pts)
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static __poll_t pidfd_poll(struct file *file, struct poll_table_struct *pts)
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{
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struct task_struct *task;
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struct pid *pid = file->private_data;
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int poll_flags = 0;
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__poll_t poll_flags = 0;
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poll_wait(file, &pid->wait_pidfd, pts);
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@ -1701,7 +1701,7 @@ static unsigned int pidfd_poll(struct file *file, struct poll_table_struct *pts)
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* group, then poll(2) should block, similar to the wait(2) family.
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*/
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if (!task || (task->exit_state && thread_group_empty(task)))
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poll_flags = POLLIN | POLLRDNORM;
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poll_flags = EPOLLIN | EPOLLRDNORM;
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rcu_read_unlock();
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return poll_flags;
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