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Merge branch 'android12-5.10' into android12-5.10-lts

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Sync up with android12-5.10 for the following commits:

3de34cc5ea UPSTREAM: pipe: make pipe writes always wake up readers
6b7e007164 ANDROID: Revert "ANDROID: fs: pipe: wakeup readers on small writes even if pipe had data"
dac8af7144 ANDROID: GKI: Enable CONFIG_USB_EHCI_ROOT_HUB_TT

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I220ff2999b3aa0b066e84de25da8e2307bb31685
This commit is contained in:
Greg Kroah-Hartman
2021-08-04 15:00:46 +02:00
parent 1afedcdcf8 3de34cc5ea
commit 75ca4a8efe
3 changed files with 11 additions and 10 deletions
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1
arch/arm64/configs/gki_defconfig
View File

@@ -469,6 +469,7 @@ CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
CONFIG_USB_OTG=y
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_EHCI_ROOT_HUB_TT=y
CONFIG_USB_EHCI_HCD_PLATFORM=y
CONFIG_USB_ACM=y
CONFIG_USB_STORAGE=y

1
arch/x86/configs/gki_defconfig
View File

@@ -421,6 +421,7 @@ CONFIG_USB_HIDDEV=y
CONFIG_USB_ANNOUNCE_NEW_DEVICES=y
CONFIG_USB_XHCI_HCD=y
CONFIG_USB_EHCI_HCD=y
CONFIG_USB_EHCI_ROOT_HUB_TT=y
CONFIG_USB_EHCI_HCD_PLATFORM=y
CONFIG_USB_ACM=y
CONFIG_USB_STORAGE=y

19
fs/pipe.c
View File

@@ -406,7 +406,7 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
ssize_t ret = 0;
size_t total_len = iov_iter_count(from);
ssize_t chars;
bool do_wakeup = false;
bool was_empty = false;
bool wake_next_writer = false;
/* Null write succeeds. */
@@ -429,18 +429,18 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
#endif
/*
* Wake up readers if the pipe was written to. Regardless
* of whether it was empty or not. Otherwise, threads
* waiting with EPOLLET will hang until the pipe is emptied.
* Epoll nonsensically wants a wakeup whether the pipe
* was already empty or not.
*
* If pipe wasn't empty we try to merge new data into
* If it wasn't empty we try to merge new data into
* the last buffer.
*
* That naturally merges small writes, but it also
* page-aligs the rest of the writes for large writes
* page-aligns the rest of the writes for large writes
* spanning multiple pages.
*/
head = pipe->head;
was_empty = true;
chars = total_len & (PAGE_SIZE-1);
if (chars && !pipe_empty(head, pipe->tail)) {
unsigned int mask = pipe->ring_size - 1;
@@ -460,7 +460,6 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
}
buf->len += ret;
do_wakeup = true;
if (!iov_iter_count(from))
goto out;
}
@@ -527,7 +526,6 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
ret += copied;
buf->offset = 0;
buf->len = copied;
do_wakeup = true;
if (!iov_iter_count(from))
break;
@@ -555,12 +553,13 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
* become empty while we dropped the lock.
*/
__pipe_unlock(pipe);
if (do_wakeup) {
if (was_empty) {
wake_up_interruptible_sync_poll(&pipe->rd_wait, EPOLLIN | EPOLLRDNORM);
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
}
wait_event_interruptible_exclusive(pipe->wr_wait, pipe_writable(pipe));
__pipe_lock(pipe);
was_empty = pipe_empty(pipe->head, pipe->tail);
wake_next_writer = true;
}
out:
@@ -577,7 +576,7 @@ out:
* how (for example) the GNU make jobserver uses small writes to
* wake up pending jobs
*/
if (do_wakeup) {
if (was_empty) {
wake_up_interruptible_sync_poll(&pipe->rd_wait, EPOLLIN | EPOLLRDNORM);
kill_fasync(&pipe->fasync_readers, SIGIO, POLL_IN);
}