Skip to content
Commit 0c4ab18f authored by Kirill Smelkov's avatar Kirill Smelkov Committed by Masahiro Yamada
Browse files

coccinelle: api/stream_open: treat all wait_.*() calls as blocking

Previously steam_open.cocci was treating only wait_event_.* - e.g.
wait_event_interruptible - as a blocking operation. However e.g.
wait_for_completion_interruptible is also blocking, and so from this
point of view it would be more logical to treat all wait_.* as a
blocking point.

The logic of this change actually came up for real when
drivers/pci/switch/switchtec.c changed from using
wait_event_interruptible to wait_for_completion_interruptible:

	https://lore.kernel.org/linux-pci/20190413170056.GA11293@deco.navytux.spb.ru/
	https://lore.kernel.org/linux-pci/20190415145456.GA15280@deco.navytux.spb.ru/
	https://lore.kernel.org/linux-pci/20190415154102.GB17661@deco.navytux.spb.ru/



For a driver that uses nonseekable_open with read/write having stream
semantic and read also calling e.g. wait_for_completion_interruptible,
running stream_open.cocci before this patch would produce:

	WARNING: <driver>_fops: .read() and .write() have stream semantic; safe to change nonseekable_open -> stream_open.

while after this patch it will report:

	ERROR: <driver>_fops: .read() can deadlock .write(); change nonseekable_open -> stream_open to fix.

Signed-off-by: default avatarKirill Smelkov <kirr@nexedi.com>
Acked-by: default avatarJulia Lawall <julia.lawall@lip6.fr>
Signed-off-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
parent f58c17c2
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment