[PATCH v2 1/1] Input: don't modify the id of ioctl-provided ff effect on upload failure (1 reply)

If a new (id == -1) ff effect was uploaded from userspace,
ff-core.c::input_ff_upload() will have assigned
a positive number to the new effect id.
Currently, evdev.c::evdev_do_ioctl() will save this new id to userspace,
regardless of whether the upload succeeded or not.

On upload failure, this can be confusing because the dev->ff->effects[] array
will not contain an element at the index of that new effect id.

This patch fixes this by leaving the id unchanged after upload fails.

Note: Unfortunately applications should still expect changed effect id for
quite some time.

This has been discussed on:
http://www.mail-archive.com/linux-input@vger.kernel.org/msg08513.html
("ff-core effect id handling in case of a failed effect upload")

Suggested-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Signed-off-by: Elias Vanderstuyft <elias.vds@gmail.com>
Cc: Anssi Hannula <anssi.hannula@iki.fi>
Cc: Michal Malý <madcatxster@devoid-pointer.net>
Cc: linux-input@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
---
v2:
Only added one line to the commit message to say
what this patch actually does,
instead of only stating the reason why it's submitted.

drivers/input/evdev.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/input/evdev.c b/drivers/input/evdev.c
index a06e125..ce953d8 100644
--- a/drivers/input/evdev.c
+++ b/drivers/input/evdev.c
@@ -954,11 +954,13 @@ static long evdev_do_ioctl(struct file *file, unsigned int cmd,
return -EFAULT;

error = input_ff_upload(dev, &effect, file);
+ if (error)
+ return error;

if (put_user(effect.id, &(((struct ff_effect __user *)p)->id)))
return -EFAULT;

- return error;
+ return 0;
}

/* Multi-number variable-length handlers */
--
1.8.3.1

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