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Commit 2b838687 authored by Linus Torvalds's avatar Linus Torvalds
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Make /dev/zero reads interruptible by signals 



This helps with bad latencies for large reads from /dev/zero, but might
conceivably break some application that "knows" that a read of /dev/zero
cannot return early.  So do this early in the merge window to give us
maximal test coverage, even if the patch is totally trivial.

Obviously, no well-behaved application should ever depend on the read
being uninterruptible, but hey, bugs happen.

Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 07a2039b

drivers/char/mem.c

+2 −3
Original line number Diff line number Diff line
@@ -694,9 +694,8 @@ static ssize_t read_zero(struct file * file, char __user * buf, 
		written += chunk - unwritten;

		if (unwritten)

			break;

		/* Consider changing this to just 'signal_pending()' with lots of testing */

		if (fatal_signal_pending(current))

			return written ? written : -EINTR;

		if (signal_pending(current))

			return written ? written : -ERESTARTSYS;

		buf += chunk;

		count -= chunk;

		cond_resched();