[PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup function

[PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup function

[Tomasz Figa]

This is a copy of commit 5c5f1baee85a ("ASoC: Intel:
kbl_rt5663_rt5514_max98927: Fix kabylake_ssp_fixup function") applied to
the kbl_rt5663_max98927 board file.

Original explanation of the change:

kabylake_ssp_fixup function uses snd_soc_dpcm to identify the
codecs DAIs. The HW parameters are changed based on the codec DAI of the
stream. The earlier approach to get snd_soc_dpcm was using container_of()
macro on snd_pcm_hw_params.

The structures have been modified over time and snd_soc_dpcm does not have
snd_pcm_hw_params as a reference but as a copy. This causes the current
driver to crash when used.

This patch changes the way snd_soc_dpcm is extracted. snd_soc_pcm_runtime
holds 2 dpcm instances (one for playback and one for capture). 2 codecs
on the SSP are dmic (capture) and speakers (playback). Based on the
stream direction, snd_soc_dpcm is extracted from snd_soc_pcm_runtime.

Fixes a boot crash on a HP Chromebook x2:

[   16.582225] BUG: kernel NULL pointer dereference, address: 0000000000000050
[   16.582231] #PF: supervisor read access in kernel mode
[   16.582233] #PF: error_code(0x0000) - not-present page
[   16.582234] PGD 0 P4D 0
[   16.582238] Oops: 0000 [#1] PREEMPT SMP PTI
[   16.582241] CPU: 0 PID: 1980 Comm: cras Tainted: G         C        5.4.58 #1
[   16.582243] Hardware name: HP Soraka/Soraka, BIOS Google_Soraka.10431.75.0 08/30/2018
[   16.582247] RIP: 0010:kabylake_ssp_fixup+0x19/0xbb [snd_soc_kbl_rt5663_max98927]
[   16.582250] Code: c6 6f c5 80 c0 44 89 f2 31 c0 e8 3e c9 4c d6 eb de 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 53 48 89 f3 48 8b 46 c8 48 8b 4e d0 <48> 8b 49 10 4c 8b 78 10 4c 8b 31 4c 89 f7 48 c7 c6 4b c2 80 c0 e8
[   16.582252] RSP: 0000:ffffaf7e81e0b958 EFLAGS: 00010282
[   16.582254] RAX: ffffffff96f13e0d RBX: ffffaf7e81e0ba00 RCX: 0000000000000040
[   16.582256] RDX: ffffaf7e81e0ba00 RSI: ffffaf7e81e0ba00 RDI: ffffa3b208558028
[   16.582258] RBP: ffffaf7e81e0b970 R08: ffffa3b203b54160 R09: ffffaf7e81e0ba00
[   16.582259] R10: 0000000000000000 R11: ffffffffc080b345 R12: ffffa3b209fb6e00
[   16.582261] R13: ffffa3b1b1a47838 R14: ffffa3b1e6197f28 R15: ffffaf7e81e0ba00
[   16.582263] FS:  00007eb3f25aaf80(0000) GS:ffffa3b236a00000(0000) knlGS:0000000000000000
[   16.582265] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   16.582267] CR2: 0000000000000050 CR3: 0000000246bc8006 CR4: 00000000003606f0
[   16.582269] Call Trace:
[   16.582275]  snd_soc_link_be_hw_params_fixup+0x21/0x68
[   16.582278]  snd_soc_dai_hw_params+0x25/0x94
[   16.582282]  soc_pcm_hw_params+0x2d8/0x583
[   16.582288]  dpcm_be_dai_hw_params+0x172/0x29e
[   16.582291]  dpcm_fe_dai_hw_params+0x9f/0x12f
[   16.582295]  snd_pcm_hw_params+0x137/0x41c
[   16.582298]  snd_pcm_hw_params_user+0x3c/0x71
[   16.582301]  snd_pcm_common_ioctl+0x2c6/0x565
[   16.582304]  snd_pcm_ioctl+0x32/0x36
[   16.582307]  do_vfs_ioctl+0x506/0x783
[   16.582311]  ksys_ioctl+0x58/0x83
[   16.582313]  __x64_sys_ioctl+0x1a/0x1e
[   16.582316]  do_syscall_64+0x54/0x7e
[   16.582319]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   16.582322] RIP: 0033:0x7eb3f1886157
[   16.582324] Code: 8a 66 90 48 8b 05 11 dd 2b 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 dc 2b 00 f7 d8 64 89 01 48
[   16.582326] RSP: 002b:00007ffff7559818 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[   16.582329] RAX: ffffffffffffffda RBX: 00005acc9188b140 RCX: 00007eb3f1886157
[   16.582330] RDX: 00007ffff7559940 RSI: 00000000c2604111 RDI: 000000000000001e
[   16.582332] RBP: 00007ffff7559840 R08: 0000000000000004 R09: 0000000000000000
[   16.582333] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000bb80
[   16.582335] R13: 00005acc91702e80 R14: 00007ffff7559940 R15: 00005acc91702e80
[   16.582337] Modules linked in: rfcomm cmac algif_hash algif_skcipher af_alg uinput hid_google_hammer snd_soc_kbl_rt5663_max98927 snd_soc_hdac_hdmi snd_soc_dmic snd_soc_skl_ssp_clk snd_soc_skl snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_hdac_hda snd_soc_acpi_intel_match snd_soc_acpi snd_hda_ext_core snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core ipu3_cio2 ipu3_imgu(C) videobuf2_v4l2 videobuf2_common videobuf2_dma_sg videobuf2_memops snd_soc_rt5663 snd_soc_max98927 snd_soc_rl6231 ov5670 ov13858 acpi_als v4l2_fwnode dw9714 fuse xt_MASQUERADE iio_trig_sysfs cros_ec_light_prox cros_ec_sensors cros_ec_sensors_core cros_ec_sensors_ring industrialio_triggered_buffer kfifo_buf industrialio cros_ec_sensorhub cdc_ether usbnet btusb btrtl btintel btbcm bluetooth ecdh_generic ecc lzo_rle lzo_compress iwlmvm zram iwl7000_mac80211 r8152 mii iwlwifi cfg80211 joydev
[   16.584243] gsmi: Log Shutdown Reason 0x03
[   16.584246] CR2: 0000000000000050
[   16.584248] ---[ end trace c8511d090c11edff ]---

Suggested-by: Łukasz Majczak <lmajczak@google.com>
Fixes: 2e5894d73789e ("ASoC: pcm: Add support for DAI multicodec")
Signed-off-by: Tomasz Figa <tfiga@chromium.org>
---
 sound/soc/intel/boards/kbl_rt5663_max98927.c | 39 ++++++++++++++++----
 1 file changed, 31 insertions(+), 8 deletions(-)

diff --git a/sound/soc/intel/boards/kbl_rt5663_max98927.c b/sound/soc/intel/boards/kbl_rt5663_max98927.c
index 3ea4602dfb3e..9a4b3d0973f6 100644
--- a/sound/soc/intel/boards/kbl_rt5663_max98927.c
+++ b/sound/soc/intel/boards/kbl_rt5663_max98927.c
@@ -401,17 +401,40 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
 	struct snd_interval *chan = hw_param_interval(params,
 			SNDRV_PCM_HW_PARAM_CHANNELS);
 	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
-	struct snd_soc_dpcm *dpcm = container_of(
-			params, struct snd_soc_dpcm, hw_params);
-	struct snd_soc_dai_link *fe_dai_link = dpcm->fe->dai_link;
-	struct snd_soc_dai_link *be_dai_link = dpcm->be->dai_link;
+	struct snd_soc_dpcm *dpcm, *rtd_dpcm = NULL;
+
+	/*
+	 * The following loop will be called only for playback stream
+	 * In this platform, there is only one playback device on every SSP
+	 */
+	for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_PLAYBACK, dpcm) {
+		rtd_dpcm = dpcm;
+		break;
+	}
+
+	/*
+	 * This following loop will be called only for capture stream
+	 * In this platform, there is only one capture device on every SSP
+	 */
+	for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_CAPTURE, dpcm) {
+		rtd_dpcm = dpcm;
+		break;
+	}
+
+	if (!rtd_dpcm)
+		return -EINVAL;
+
+	/*
+	 * The above 2 loops are mutually exclusive based on the stream direction,
+	 * thus rtd_dpcm variable will never be overwritten
+	 */
 
 	/*
 	 * The ADSP will convert the FE rate to 48k, stereo, 24 bit
 	 */
-	if (!strcmp(fe_dai_link->name, "Kbl Audio Port") ||
-	    !strcmp(fe_dai_link->name, "Kbl Audio Headset Playback") ||
-	    !strcmp(fe_dai_link->name, "Kbl Audio Capture Port")) {
+	if (!strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Port") ||
+	    !strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Headset Playback") ||
+	    !strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Capture Port")) {
 		rate->min = rate->max = 48000;
 		chan->min = chan->max = 2;
 		snd_mask_none(fmt);
@@ -421,7 +444,7 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
 	 * The speaker on the SSP0 supports S16_LE and not S24_LE.
 	 * thus changing the mask here
 	 */
-	if (!strcmp(be_dai_link->name, "SSP0-Codec"))
+	if (!strcmp(rtd_dpcm->be->dai_link->name, "SSP0-Codec"))
 		snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);
 
 	return 0;
-- 
2.28.0.1011.ga647a8990f-goog

Re: [PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup function

[Pierre-Louis Bossart]

On 10/14/20 9:16 AM, Tomasz Figa wrote:
> This is a copy of commit 5c5f1baee85a ("ASoC: Intel:
> kbl_rt5663_rt5514_max98927: Fix kabylake_ssp_fixup function") applied to
> the kbl_rt5663_max98927 board file.
> 
> Original explanation of the change:
> 
> kabylake_ssp_fixup function uses snd_soc_dpcm to identify the
> codecs DAIs. The HW parameters are changed based on the codec DAI of the
> stream. The earlier approach to get snd_soc_dpcm was using container_of()
> macro on snd_pcm_hw_params.
> 
> The structures have been modified over time and snd_soc_dpcm does not have
> snd_pcm_hw_params as a reference but as a copy. This causes the current
> driver to crash when used.
> 
> This patch changes the way snd_soc_dpcm is extracted. snd_soc_pcm_runtime
> holds 2 dpcm instances (one for playback and one for capture). 2 codecs
> on the SSP are dmic (capture) and speakers (playback). Based on the
> stream direction, snd_soc_dpcm is extracted from snd_soc_pcm_runtime.
> 
> Fixes a boot crash on a HP Chromebook x2:
> 
> [   16.582225] BUG: kernel NULL pointer dereference, address: 0000000000000050
> [   16.582231] #PF: supervisor read access in kernel mode
> [   16.582233] #PF: error_code(0x0000) - not-present page
> [   16.582234] PGD 0 P4D 0
> [   16.582238] Oops: 0000 [#1] PREEMPT SMP PTI
> [   16.582241] CPU: 0 PID: 1980 Comm: cras Tainted: G         C        5.4.58 #1
> [   16.582243] Hardware name: HP Soraka/Soraka, BIOS Google_Soraka.10431.75.0 08/30/2018
> [   16.582247] RIP: 0010:kabylake_ssp_fixup+0x19/0xbb [snd_soc_kbl_rt5663_max98927]
> [   16.582250] Code: c6 6f c5 80 c0 44 89 f2 31 c0 e8 3e c9 4c d6 eb de 0f 1f 44 00 00 55 48 89 e5 41 57 41 56 53 48 89 f3 48 8b 46 c8 48 8b 4e d0 <48> 8b 49 10 4c 8b 78 10 4c 8b 31 4c 89 f7 48 c7 c6 4b c2 80 c0 e8
> [   16.582252] RSP: 0000:ffffaf7e81e0b958 EFLAGS: 00010282
> [   16.582254] RAX: ffffffff96f13e0d RBX: ffffaf7e81e0ba00 RCX: 0000000000000040
> [   16.582256] RDX: ffffaf7e81e0ba00 RSI: ffffaf7e81e0ba00 RDI: ffffa3b208558028
> [   16.582258] RBP: ffffaf7e81e0b970 R08: ffffa3b203b54160 R09: ffffaf7e81e0ba00
> [   16.582259] R10: 0000000000000000 R11: ffffffffc080b345 R12: ffffa3b209fb6e00
> [   16.582261] R13: ffffa3b1b1a47838 R14: ffffa3b1e6197f28 R15: ffffaf7e81e0ba00
> [   16.582263] FS:  00007eb3f25aaf80(0000) GS:ffffa3b236a00000(0000) knlGS:0000000000000000
> [   16.582265] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [   16.582267] CR2: 0000000000000050 CR3: 0000000246bc8006 CR4: 00000000003606f0
> [   16.582269] Call Trace:
> [   16.582275]  snd_soc_link_be_hw_params_fixup+0x21/0x68
> [   16.582278]  snd_soc_dai_hw_params+0x25/0x94
> [   16.582282]  soc_pcm_hw_params+0x2d8/0x583
> [   16.582288]  dpcm_be_dai_hw_params+0x172/0x29e
> [   16.582291]  dpcm_fe_dai_hw_params+0x9f/0x12f
> [   16.582295]  snd_pcm_hw_params+0x137/0x41c
> [   16.582298]  snd_pcm_hw_params_user+0x3c/0x71
> [   16.582301]  snd_pcm_common_ioctl+0x2c6/0x565
> [   16.582304]  snd_pcm_ioctl+0x32/0x36
> [   16.582307]  do_vfs_ioctl+0x506/0x783
> [   16.582311]  ksys_ioctl+0x58/0x83
> [   16.582313]  __x64_sys_ioctl+0x1a/0x1e
> [   16.582316]  do_syscall_64+0x54/0x7e
> [   16.582319]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
> [   16.582322] RIP: 0033:0x7eb3f1886157
> [   16.582324] Code: 8a 66 90 48 8b 05 11 dd 2b 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 dc 2b 00 f7 d8 64 89 01 48
> [   16.582326] RSP: 002b:00007ffff7559818 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
> [   16.582329] RAX: ffffffffffffffda RBX: 00005acc9188b140 RCX: 00007eb3f1886157
> [   16.582330] RDX: 00007ffff7559940 RSI: 00000000c2604111 RDI: 000000000000001e
> [   16.582332] RBP: 00007ffff7559840 R08: 0000000000000004 R09: 0000000000000000
> [   16.582333] R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000bb80
> [   16.582335] R13: 00005acc91702e80 R14: 00007ffff7559940 R15: 00005acc91702e80
> [   16.582337] Modules linked in: rfcomm cmac algif_hash algif_skcipher af_alg uinput hid_google_hammer snd_soc_kbl_rt5663_max98927 snd_soc_hdac_hdmi snd_soc_dmic snd_soc_skl_ssp_clk snd_soc_skl snd_soc_sst_ipc snd_soc_sst_dsp snd_soc_hdac_hda snd_soc_acpi_intel_match snd_soc_acpi snd_hda_ext_core snd_intel_dspcfg snd_hda_codec snd_hwdep snd_hda_core ipu3_cio2 ipu3_imgu(C) videobuf2_v4l2 videobuf2_common videobuf2_dma_sg videobuf2_memops snd_soc_rt5663 snd_soc_max98927 snd_soc_rl6231 ov5670 ov13858 acpi_als v4l2_fwnode dw9714 fuse xt_MASQUERADE iio_trig_sysfs cros_ec_light_prox cros_ec_sensors cros_ec_sensors_core cros_ec_sensors_ring industrialio_triggered_buffer kfifo_buf industrialio cros_ec_sensorhub cdc_ether usbnet btusb btrtl btintel btbcm bluetooth ecdh_generic ecc lzo_rle lzo_compress iwlmvm zram iwl7000_mac80211 r8152 mii iwlwifi cfg80211 joydev
> [   16.584243] gsmi: Log Shutdown Reason 0x03
> [   16.584246] CR2: 0000000000000050
> [   16.584248] ---[ end trace c8511d090c11edff ]---
> 
> Suggested-by: Łukasz Majczak <lmajczak@google.com>
> Fixes: 2e5894d73789e ("ASoC: pcm: Add support for DAI multicodec")
> Signed-off-by: Tomasz Figa <tfiga@chromium.org>

Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>

Thanks!

> ---
>   sound/soc/intel/boards/kbl_rt5663_max98927.c | 39 ++++++++++++++++----
>   1 file changed, 31 insertions(+), 8 deletions(-)
> 
> diff --git a/sound/soc/intel/boards/kbl_rt5663_max98927.c b/sound/soc/intel/boards/kbl_rt5663_max98927.c
> index 3ea4602dfb3e..9a4b3d0973f6 100644
> --- a/sound/soc/intel/boards/kbl_rt5663_max98927.c
> +++ b/sound/soc/intel/boards/kbl_rt5663_max98927.c
> @@ -401,17 +401,40 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
>   	struct snd_interval *chan = hw_param_interval(params,
>   			SNDRV_PCM_HW_PARAM_CHANNELS);
>   	struct snd_mask *fmt = hw_param_mask(params, SNDRV_PCM_HW_PARAM_FORMAT);
> -	struct snd_soc_dpcm *dpcm = container_of(
> -			params, struct snd_soc_dpcm, hw_params);
> -	struct snd_soc_dai_link *fe_dai_link = dpcm->fe->dai_link;
> -	struct snd_soc_dai_link *be_dai_link = dpcm->be->dai_link;
> +	struct snd_soc_dpcm *dpcm, *rtd_dpcm = NULL;
> +
> +	/*
> +	 * The following loop will be called only for playback stream
> +	 * In this platform, there is only one playback device on every SSP
> +	 */
> +	for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_PLAYBACK, dpcm) {
> +		rtd_dpcm = dpcm;
> +		break;
> +	}
> +
> +	/*
> +	 * This following loop will be called only for capture stream
> +	 * In this platform, there is only one capture device on every SSP
> +	 */
> +	for_each_dpcm_fe(rtd, SNDRV_PCM_STREAM_CAPTURE, dpcm) {
> +		rtd_dpcm = dpcm;
> +		break;
> +	}
> +
> +	if (!rtd_dpcm)
> +		return -EINVAL;
> +
> +	/*
> +	 * The above 2 loops are mutually exclusive based on the stream direction,
> +	 * thus rtd_dpcm variable will never be overwritten
> +	 */
>   
>   	/*
>   	 * The ADSP will convert the FE rate to 48k, stereo, 24 bit
>   	 */
> -	if (!strcmp(fe_dai_link->name, "Kbl Audio Port") ||
> -	    !strcmp(fe_dai_link->name, "Kbl Audio Headset Playback") ||
> -	    !strcmp(fe_dai_link->name, "Kbl Audio Capture Port")) {
> +	if (!strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Port") ||
> +	    !strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Headset Playback") ||
> +	    !strcmp(rtd_dpcm->fe->dai_link->name, "Kbl Audio Capture Port")) {
>   		rate->min = rate->max = 48000;
>   		chan->min = chan->max = 2;
>   		snd_mask_none(fmt);
> @@ -421,7 +444,7 @@ static int kabylake_ssp_fixup(struct snd_soc_pcm_runtime *rtd,
>   	 * The speaker on the SSP0 supports S16_LE and not S24_LE.
>   	 * thus changing the mask here
>   	 */
> -	if (!strcmp(be_dai_link->name, "SSP0-Codec"))
> +	if (!strcmp(rtd_dpcm->be->dai_link->name, "SSP0-Codec"))
>   		snd_mask_set_format(fmt, SNDRV_PCM_FORMAT_S16_LE);
>   
>   	return 0;
> 

Re: [PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup function

[Mark Brown]

[-- Attachment #1: Type: text/plain, Size: 955 bytes --]

On Wed, Oct 14, 2020 at 02:16:24PM +0000, Tomasz Figa wrote:

> Fixes a boot crash on a HP Chromebook x2:
> 
> [   16.582225] BUG: kernel NULL pointer dereference, address: 0000000000000050
> [   16.582231] #PF: supervisor read access in kernel mode
> [   16.582233] #PF: error_code(0x0000) - not-present page
> [   16.582234] PGD 0 P4D 0
> [   16.582238] Oops: 0000 [#1] PREEMPT SMP PTI
> [   16.582241] CPU: 0 PID: 1980 Comm: cras Tainted: G         C        5.4.58 #1
> [   16.582243] Hardware name: HP Soraka/Soraka, BIOS Google_Soraka.10431.75.0 08/30/2018

Please think hard before including complete backtraces in upstream
reports, they are very large and contain almost no useful information
relative to their size so often obscure the relevant content in your
message. If part of the backtrace is usefully illustrative (it often is
for search engines if nothing else) then it's usually better to pull out
the relevant sections.

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 488 bytes --]

Re: [PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup function

[Mark Brown]

On Wed, 14 Oct 2020 14:16:24 +0000, Tomasz Figa wrote:
> This is a copy of commit 5c5f1baee85a ("ASoC: Intel:
> kbl_rt5663_rt5514_max98927: Fix kabylake_ssp_fixup function") applied to
> the kbl_rt5663_max98927 board file.
> 
> Original explanation of the change:
> 
> kabylake_ssp_fixup function uses snd_soc_dpcm to identify the
> codecs DAIs. The HW parameters are changed based on the codec DAI of the
> stream. The earlier approach to get snd_soc_dpcm was using container_of()
> macro on snd_pcm_hw_params.
> 
> [...]

Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next

Thanks!

[1/1] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup function
      commit: 9fe9efd6924c9a62ebb759025bb8927e398f51f7

All being well this means that it will be integrated into the linux-next
tree (usually sometime in the next 24 hours) and sent to Linus during
the next merge window (or sooner if it is a bug fix), however if
problems are discovered then the patch may be dropped or reverted.

You may get further e-mails resulting from automated or manual testing
and review of the tree, please engage with people reporting problems and
send followup patches addressing any issues that are reported if needed.

If any updates are required or you are submitting further changes they
should be sent as incremental updates against current git, existing
patches will not be replaced.

Please add any relevant lists and maintainers to the CCs when replying
to this mail.

Thanks,
Mark

Re: [PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup function

[Tomasz Figa]

On Wed, Oct 14, 2020 at 08:02:26PM +0100, Mark Brown wrote:
> On Wed, Oct 14, 2020 at 02:16:24PM +0000, Tomasz Figa wrote:
> 
> > Fixes a boot crash on a HP Chromebook x2:
> > 
> > [   16.582225] BUG: kernel NULL pointer dereference, address: 0000000000000050
> > [   16.582231] #PF: supervisor read access in kernel mode
> > [   16.582233] #PF: error_code(0x0000) - not-present page
> > [   16.582234] PGD 0 P4D 0
> > [   16.582238] Oops: 0000 [#1] PREEMPT SMP PTI
> > [   16.582241] CPU: 0 PID: 1980 Comm: cras Tainted: G         C        5.4.58 #1
> > [   16.582243] Hardware name: HP Soraka/Soraka, BIOS Google_Soraka.10431.75.0 08/30/2018
> 
> Please think hard before including complete backtraces in upstream
> reports, they are very large and contain almost no useful information
> relative to their size so often obscure the relevant content in your
> message. If part of the backtrace is usefully illustrative (it often is
> for search engines if nothing else) then it's usually better to pull out
> the relevant sections.

Okay, I'll trim things down next time. Somehow I was convinced it's a
common practice.

Best regards,
Tomasz

Re: [PATCH] ASoC: Intel: kbl_rt5663_max98927: Fix kabylake_ssp_fixup function

[Mark Brown]

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On Mon, Oct 26, 2020 at 10:27:47PM +0000, Tomasz Figa wrote:
> On Wed, Oct 14, 2020 at 08:02:26PM +0100, Mark Brown wrote:

> > Please think hard before including complete backtraces in upstream
> > reports, they are very large and contain almost no useful information
> > relative to their size so often obscure the relevant content in your
> > message. If part of the backtrace is usefully illustrative (it often is
> > for search engines if nothing else) then it's usually better to pull out
> > the relevant sections.

> Okay, I'll trim things down next time. Somehow I was convinced it's a
> common practice.

It is unfortunately far more common than it should be but that doesn't
mean that it's a good idea!

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