On Thu, 18 Mar 2021 16:11:21 +0100, Amadeusz Sławiński wrote:
When SND_HDA_PREALLOC_SIZE is set to 0, applications can request as much memory as there is allowed. With value of AZX_MAX_BUF_SIZE it is 1GB per stream, which is not realistic use case. Change it 4MB.
Bug: https://bugzilla.kernel.org/show_bug.cgi?id=201251#c322 Suggested-by: Takashi Iwai tiwai@suse.de Signed-off-by: Amadeusz Sławiński amadeuszx.slawinski@linux.intel.com
include/sound/hda_register.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/include/sound/hda_register.h b/include/sound/hda_register.h index 4f987b1f32f7..68d420f3c49d 100644 --- a/include/sound/hda_register.h +++ b/include/sound/hda_register.h @@ -140,8 +140,8 @@ enum { SDI0, SDI1, SDI2, SDI3, SDO0, SDO1, SDO2, SDO3 }; #define BDL_SIZE 4096 #define AZX_MAX_BDL_ENTRIES (BDL_SIZE / 16) #define AZX_MAX_FRAG 32 -/* max buffer size - no h/w limit, you can increase as you like */ -#define AZX_MAX_BUF_SIZE (1024*1024*1024) +/* max buffer size - 4MB limit per stream */ +#define AZX_MAX_BUF_SIZE (4*1024*1024)
This deserves for a comment that it's an artificial limit just for avoiding a pitfall.
thanks,
Takashi