From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D6CBB3385B6; Mon, 20 Apr 2026 15:55:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776700519; cv=none; b=lrNk+xXDbiepnjLhFDpBdGRwCURcRU7hdlYmvFobI9GcnQzXOPsWmZpbFr19ASQPQDQroe3QLd0X1JJaA0HxUNzy8zokE1Ecg4npQVTkUsXc8Id7HATFKfWfQuXCApE7Vo9QPqZkpySXT59N8zSGoREjWbMkDPFZBxVhOD3sOlc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776700519; c=relaxed/simple; bh=nsVoiw2CaHThiSDItu9J8Wt7uwMcz6IhjQD+Sfua+Vo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=plBNZpAJnplX94VmIkFu3FQphUPquy3vKpRb0raC0YYMVrzJq496TOSbXVtnM3BR22ZH3GDKtpfiPmstGwt5LMs4VAZhnVTT+shWRhhWiWX0HQnpH1khAt4Gn+yIAo/KpgwQtRxxJ7H76HW6oloyxccronGATOSOsMhMQhpLSL4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=YUcUWBeH; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="YUcUWBeH" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A2AEC19425; Mon, 20 Apr 2026 15:55:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1776700519; bh=nsVoiw2CaHThiSDItu9J8Wt7uwMcz6IhjQD+Sfua+Vo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YUcUWBeH7si02ljOVcLEsz0+VDKgM2RU8WpbwZyEn9lD898ke573klMne7sU7dnrc /ITYTEOmT0tLspyUtV/QJCTN8VNTrJW2A4m5ysGx4Mt59xfddugBSdn507xjtmejkb lm6djjRhC9bIqUkt+ennKuCBHJgrYbwlVxId1f7E= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Harin Lee , Takashi Iwai Subject: [PATCH 6.19 177/220] ALSA: ctxfi: Limit PTP to a single page Date: Mon, 20 Apr 2026 17:41:58 +0200 Message-ID: <20260420153940.400642719@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260420153934.013228280@linuxfoundation.org> References: <20260420153934.013228280@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Harin Lee commit e9418da50d9e5c496c22fe392e4ad74c038a94eb upstream. Commit 391e69143d0a increased CT_PTP_NUM from 1 to 4 to support 256 playback streams, but the additional pages are not used by the card correctly. The CT20K2 hardware already has multiple VMEM_PTPAL registers, but using them separately would require refactoring the entire virtual memory allocation logic. ct_vm_map() always uses PTEs in vm->ptp[0].area regardless of CT_PTP_NUM. On AMD64 systems, a single PTP covers 512 PTEs (2M). When aggregate memory allocations exceed this limit, ct_vm_map() tries to access beyond the allocated space and causes a page fault: BUG: unable to handle page fault for address: ffffd4ae8a10a000 Oops: Oops: 0002 [#1] SMP PTI RIP: 0010:ct_vm_map+0x17c/0x280 [snd_ctxfi] Call Trace: atc_pcm_playback_prepare+0x225/0x3b0 ct_pcm_playback_prepare+0x38/0x60 snd_pcm_do_prepare+0x2f/0x50 snd_pcm_action_single+0x36/0x90 snd_pcm_action_nonatomic+0xbf/0xd0 snd_pcm_ioctl+0x28/0x40 __x64_sys_ioctl+0x97/0xe0 do_syscall_64+0x81/0x610 entry_SYSCALL_64_after_hwframe+0x76/0x7e Revert CT_PTP_NUM to 1. The 256 SRC_RESOURCE_NUM and playback_count remain unchanged. Fixes: 391e69143d0a ("ALSA: ctxfi: Bump playback substreams to 256") Cc: stable@vger.kernel.org Signed-off-by: Harin Lee Link: https://patch.msgid.link/20260406074857.216034-1-me@harin.net Signed-off-by: Takashi Iwai Signed-off-by: Greg Kroah-Hartman --- sound/pci/ctxfi/ctvmem.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/sound/pci/ctxfi/ctvmem.h +++ b/sound/pci/ctxfi/ctvmem.h @@ -15,7 +15,7 @@ #ifndef CTVMEM_H #define CTVMEM_H -#define CT_PTP_NUM 4 /* num of device page table pages */ +#define CT_PTP_NUM 1 /* num of device page table pages */ #include #include