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Date: Fri, 22 Mar 2019 16:43:53 +0100 From: Arnd Bergmann <arnd@...db.de> To: stable@...r.kernel.org, Vinod Koul <vkoul@...nel.org>, Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com> Cc: Ravindra Lokhande <rlokhande@...dia.com>, Vinod Koul <vinod.koul@...el.com>, Takashi Iwai <tiwai@...e.de>, Arnd Bergmann <arnd@...db.de>, Mark Brown <broonie@...nel.org>, Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, Joe Perches <joe@...ches.com>, Dan Carpenter <dan.carpenter@...cle.com>, alsa-devel@...a-project.org, linux-kernel@...r.kernel.org Subject: [BACKPORT 4.4.y 02/25] ALSA: compress: add support for 32bit calls in a 64bit kernel From: Ravindra Lokhande <rlokhande@...dia.com> Compress offload does not support ioctl calls from a 32bit userspace in a 64 bit kernel. This patch adds support for ioctls from a 32bit userspace in a 64bit kernel Signed-off-by: Ravindra Lokhande <rlokhande@...dia.com> Acked-by: Vinod Koul <vinod.koul@...el.com> Signed-off-by: Takashi Iwai <tiwai@...e.de> (cherry picked from commit c10368897e104c008c610915a218f0fe5fa4ec96) Signed-off-by: Arnd Bergmann <arnd@...db.de> --- sound/core/compress_offload.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/sound/core/compress_offload.c b/sound/core/compress_offload.c index 6163bf3e8177..33d40d6fa3f1 100644 --- a/sound/core/compress_offload.c +++ b/sound/core/compress_offload.c @@ -38,6 +38,7 @@ #include <linux/uio.h> #include <linux/uaccess.h> #include <linux/module.h> +#include <linux/compat.h> #include <sound/core.h> #include <sound/initval.h> #include <sound/compress_params.h> @@ -858,6 +859,15 @@ static long snd_compr_ioctl(struct file *f, unsigned int cmd, unsigned long arg) return retval; } +/* support of 32bit userspace on 64bit platforms */ +#ifdef CONFIG_COMPAT +static long snd_compr_ioctl_compat(struct file *file, unsigned int cmd, + unsigned long arg) +{ + return snd_compr_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); +} +#endif + static const struct file_operations snd_compr_file_ops = { .owner = THIS_MODULE, .open = snd_compr_open, @@ -865,6 +875,9 @@ static const struct file_operations snd_compr_file_ops = { .write = snd_compr_write, .read = snd_compr_read, .unlocked_ioctl = snd_compr_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = snd_compr_ioctl_compat, +#endif .mmap = snd_compr_mmap, .poll = snd_compr_poll, }; -- 2.20.0
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