[PATCH 0/4] wifi: ath12k: Fix the static checker warning

[PATCH 0/4] wifi: ath12k: Fix the static checker warning

[Karthikeyan Periyasamy]

This patch series fix the below Smatch static checker warnings

Warnings:
mac.c:10941 ath12k_mac_destroy() error: we previously assumed 'ab' could be null (see line 10930)
mac.c:11007 ath12k_mac_allocate() error: uninitialized symbol 'ab'.
mac.c:11013 ath12k_mac_allocate() error: uninitialized symbol 'ab'.

Karthikeyan Periyasamy (4):
  wifi: ath12k: Refactor ath12k_hw set helper function argument
  wifi: ath12k: Refactor the ath12k_hw get helper function argument
  wifi: ath12k: Refactor ath12k_get_num_hw() helper function argument
  wifi: ath12k: Fix uninitialized variable access in
    ath12k_mac_allocate() function

 drivers/net/wireless/ath/ath12k/core.c | 16 ++++-----
 drivers/net/wireless/ath/ath12k/core.h | 12 +++----
 drivers/net/wireless/ath/ath12k/mac.c  | 47 +++++++++++++++++---------
 3 files changed, 45 insertions(+), 30 deletions(-)


base-commit: 4d762e0043789e3608ad28c102131b232bd04377
-- 
2.34.1

[PATCH 1/4] wifi: ath12k: Refactor ath12k_hw set helper function argument

[Karthikeyan Periyasamy]

Currently, ath12k_hw is placed inside the ath12k_hw_group. However, the
ath12k_hw set helper function takes the device handle and the index as
parameters. Here, the index parameter is specific to the group handle.
Therefore, change this helper function argument from the device handle to
the group handle.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
---
 drivers/net/wireless/ath/ath12k/core.h | 4 ++--
 drivers/net/wireless/ath/ath12k/mac.c  | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index 458e3d0071a8..3173d94989c9 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -1175,10 +1175,10 @@ static inline struct ath12k_hw *ath12k_ab_to_ah(struct ath12k_base *ab, int idx)
 	return ab->ag->ah[idx];
 }
 
-static inline void ath12k_ab_set_ah(struct ath12k_base *ab, int idx,
+static inline void ath12k_ag_set_ah(struct ath12k_hw_group *ag, int idx,
 				    struct ath12k_hw *ah)
 {
-	ab->ag->ah[idx] = ah;
+	ag->ah[idx] = ah;
 }
 
 static inline int ath12k_get_num_hw(struct ath12k_base *ab)
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index c4eab4c1c10e..8f2ca05617e6 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -10941,7 +10941,7 @@ void ath12k_mac_destroy(struct ath12k_hw_group *ag)
 			continue;
 
 		ath12k_mac_hw_destroy(ah);
-		ath12k_ab_set_ah(ab, i, NULL);
+		ath12k_ag_set_ah(ag, i, NULL);
 	}
 }
 
@@ -11022,7 +11022,7 @@ int ath12k_mac_allocate(struct ath12k_hw_group *ag)
 			continue;
 
 		ath12k_mac_hw_destroy(ah);
-		ath12k_ab_set_ah(ab, i, NULL);
+		ath12k_ag_set_ah(ag, i, NULL);
 	}
 
 	return ret;
-- 
2.34.1

[PATCH 2/4] wifi: ath12k: Refactor the ath12k_hw get helper function argument

[Karthikeyan Periyasamy]

Currently, ath12k_hw is placed inside the ath12k_hw_group. However, the
ath12k_hw get helper function takes the device handle and the index as
parameters. Here, the index parameter is specific to the group handle.
Therefore, change this helper function argument from the device handle
to the group handle.

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
---
 drivers/net/wireless/ath/ath12k/core.c |  8 ++++----
 drivers/net/wireless/ath/ath12k/core.h |  4 ++--
 drivers/net/wireless/ath/ath12k/mac.c  | 10 +++++-----
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/core.c b/drivers/net/wireless/ath/ath12k/core.c
index 49d1ac15cb7a..bf391e6e8f72 100644
--- a/drivers/net/wireless/ath/ath12k/core.c
+++ b/drivers/net/wireless/ath/ath12k/core.c
@@ -1109,7 +1109,7 @@ static void ath12k_rfkill_work(struct work_struct *work)
 	spin_unlock_bh(&ab->base_lock);
 
 	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
-		ah = ath12k_ab_to_ah(ab, i);
+		ah = ath12k_ag_to_ah(ab->ag, i);
 		if (!ah)
 			continue;
 
@@ -1161,7 +1161,7 @@ static void ath12k_core_pre_reconfigure_recovery(struct ath12k_base *ab)
 		set_bit(ATH12K_FLAG_CRASH_FLUSH, &ab->dev_flags);
 
 	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
-		ah = ath12k_ab_to_ah(ab, i);
+		ah = ath12k_ag_to_ah(ab->ag, i);
 		if (!ah || ah->state == ATH12K_HW_STATE_OFF)
 			continue;
 
@@ -1200,7 +1200,7 @@ static void ath12k_core_post_reconfigure_recovery(struct ath12k_base *ab)
 	int i, j;
 
 	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
-		ah = ath12k_ab_to_ah(ab, i);
+		ah = ath12k_ag_to_ah(ab->ag, i);
 		if (!ah || ah->state == ATH12K_HW_STATE_OFF)
 			continue;
 
@@ -1262,7 +1262,7 @@ static void ath12k_core_restart(struct work_struct *work)
 		}
 
 		for (i = 0; i < ath12k_get_num_hw(ab); i++) {
-			ah = ath12k_ab_to_ah(ab, i);
+			ah = ath12k_ag_to_ah(ab->ag, i);
 			ieee80211_restart_hw(ah->hw);
 		}
 	}
diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index 3173d94989c9..56e740ec61e8 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -1170,9 +1170,9 @@ static inline struct ieee80211_hw *ath12k_ar_to_hw(struct ath12k *ar)
 	for ((index) = 0; ((index) < (ah)->num_radio && \
 	     ((ar) = &(ah)->radio[(index)])); (index)++)
 
-static inline struct ath12k_hw *ath12k_ab_to_ah(struct ath12k_base *ab, int idx)
+static inline struct ath12k_hw *ath12k_ag_to_ah(struct ath12k_hw_group *ag, int idx)
 {
-	return ab->ag->ah[idx];
+	return ag->ah[idx];
 }
 
 static inline void ath12k_ag_set_ah(struct ath12k_hw_group *ag, int idx,
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 8f2ca05617e6..7116516b4c01 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -10826,7 +10826,7 @@ int ath12k_mac_register(struct ath12k_hw_group *ag)
 	int ret;
 
 	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
-		ah = ath12k_ab_to_ah(ab, i);
+		ah = ath12k_ag_to_ah(ag, i);
 
 		ret = ath12k_mac_hw_register(ah);
 		if (ret)
@@ -10839,7 +10839,7 @@ int ath12k_mac_register(struct ath12k_hw_group *ag)
 
 err:
 	for (i = i - 1; i >= 0; i--) {
-		ah = ath12k_ab_to_ah(ab, i);
+		ah = ath12k_ag_to_ah(ag, i);
 		if (!ah)
 			continue;
 
@@ -10858,7 +10858,7 @@ void ath12k_mac_unregister(struct ath12k_hw_group *ag)
 	clear_bit(ATH12K_FLAG_REGISTERED, &ab->dev_flags);
 
 	for (i = ath12k_get_num_hw(ab) - 1; i >= 0; i--) {
-		ah = ath12k_ab_to_ah(ab, i);
+		ah = ath12k_ag_to_ah(ag, i);
 		if (!ah)
 			continue;
 
@@ -10936,7 +10936,7 @@ void ath12k_mac_destroy(struct ath12k_hw_group *ag)
 	}
 
 	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
-		ah = ath12k_ab_to_ah(ab, i);
+		ah = ath12k_ag_to_ah(ag, i);
 		if (!ah)
 			continue;
 
@@ -11017,7 +11017,7 @@ int ath12k_mac_allocate(struct ath12k_hw_group *ag)
 
 err:
 	for (i = i - 1; i >= 0; i--) {
-		ah = ath12k_ab_to_ah(ab, i);
+		ah = ath12k_ag_to_ah(ag, i);
 		if (!ah)
 			continue;
 
-- 
2.34.1

[PATCH 3/4] wifi: ath12k: Refactor ath12k_get_num_hw() helper function argument

[Karthikeyan Periyasamy]

Currently, the ath12k_get_num_hw() helper function takes the device handle
as an argument. Here, the number of hardware is retrieved from the group
handle. Demanding the device handle from the caller is unnecessary since
in some cases the group handle is already available. Therefore, change this
helper function argument from the device handle to the group handle. This
also fixes the below Smatch static checker warning.

Smatch warning:
ath12k_mac_destroy() error: we previously assumed 'ab' could be null

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
Closes: https://lore.kernel.org/ath12k/3e705de0-67d1-4437-97ff-4828d83ae2af@stanley.mountain/
Closes: https://scan7.scan.coverity.com/#/project-view/52682/11354?selectedIssue=1602340
Fixes: a343d97f27f5 ("wifi: ath12k: move struct ath12k_hw from per device to group")
Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
---
 drivers/net/wireless/ath/ath12k/core.c | 8 ++++----
 drivers/net/wireless/ath/ath12k/core.h | 4 ++--
 drivers/net/wireless/ath/ath12k/mac.c  | 6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/core.c b/drivers/net/wireless/ath/ath12k/core.c
index bf391e6e8f72..54309602eda4 100644
--- a/drivers/net/wireless/ath/ath12k/core.c
+++ b/drivers/net/wireless/ath/ath12k/core.c
@@ -1108,7 +1108,7 @@ static void ath12k_rfkill_work(struct work_struct *work)
 	rfkill_radio_on = ab->rfkill_radio_on;
 	spin_unlock_bh(&ab->base_lock);
 
-	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
+	for (i = 0; i < ath12k_get_num_hw(ab->ag); i++) {
 		ah = ath12k_ag_to_ah(ab->ag, i);
 		if (!ah)
 			continue;
@@ -1160,7 +1160,7 @@ static void ath12k_core_pre_reconfigure_recovery(struct ath12k_base *ab)
 	if (ab->is_reset)
 		set_bit(ATH12K_FLAG_CRASH_FLUSH, &ab->dev_flags);
 
-	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
+	for (i = 0; i < ath12k_get_num_hw(ab->ag); i++) {
 		ah = ath12k_ag_to_ah(ab->ag, i);
 		if (!ah || ah->state == ATH12K_HW_STATE_OFF)
 			continue;
@@ -1199,7 +1199,7 @@ static void ath12k_core_post_reconfigure_recovery(struct ath12k_base *ab)
 	struct ath12k *ar;
 	int i, j;
 
-	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
+	for (i = 0; i < ath12k_get_num_hw(ab->ag); i++) {
 		ah = ath12k_ag_to_ah(ab->ag, i);
 		if (!ah || ah->state == ATH12K_HW_STATE_OFF)
 			continue;
@@ -1261,7 +1261,7 @@ static void ath12k_core_restart(struct work_struct *work)
 			ath12k_dbg(ab, ATH12K_DBG_BOOT, "reset success\n");
 		}
 
-		for (i = 0; i < ath12k_get_num_hw(ab); i++) {
+		for (i = 0; i < ath12k_get_num_hw(ab->ag); i++) {
 			ah = ath12k_ag_to_ah(ab->ag, i);
 			ieee80211_restart_hw(ah->hw);
 		}
diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h
index 56e740ec61e8..6756bbb8a09b 100644
--- a/drivers/net/wireless/ath/ath12k/core.h
+++ b/drivers/net/wireless/ath/ath12k/core.h
@@ -1181,9 +1181,9 @@ static inline void ath12k_ag_set_ah(struct ath12k_hw_group *ag, int idx,
 	ag->ah[idx] = ah;
 }
 
-static inline int ath12k_get_num_hw(struct ath12k_base *ab)
+static inline int ath12k_get_num_hw(struct ath12k_hw_group *ag)
 {
-	return ab->ag->num_hw;
+	return ag->num_hw;
 }
 
 static inline struct ath12k_hw_group *ath12k_ab_to_ag(struct ath12k_base *ab)
diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 7116516b4c01..5cdc1c38b049 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -10825,7 +10825,7 @@ int ath12k_mac_register(struct ath12k_hw_group *ag)
 	int i;
 	int ret;
 
-	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
+	for (i = 0; i < ath12k_get_num_hw(ag); i++) {
 		ah = ath12k_ag_to_ah(ag, i);
 
 		ret = ath12k_mac_hw_register(ah);
@@ -10857,7 +10857,7 @@ void ath12k_mac_unregister(struct ath12k_hw_group *ag)
 
 	clear_bit(ATH12K_FLAG_REGISTERED, &ab->dev_flags);
 
-	for (i = ath12k_get_num_hw(ab) - 1; i >= 0; i--) {
+	for (i = ath12k_get_num_hw(ag) - 1; i >= 0; i--) {
 		ah = ath12k_ag_to_ah(ag, i);
 		if (!ah)
 			continue;
@@ -10935,7 +10935,7 @@ void ath12k_mac_destroy(struct ath12k_hw_group *ag)
 		}
 	}
 
-	for (i = 0; i < ath12k_get_num_hw(ab); i++) {
+	for (i = 0; i < ath12k_get_num_hw(ag); i++) {
 		ah = ath12k_ag_to_ah(ag, i);
 		if (!ah)
 			continue;
-- 
2.34.1

[PATCH 4/4] wifi: ath12k: Fix uninitialized variable access in ath12k_mac_allocate() function

[Karthikeyan Periyasamy]

Currently, the uninitialized variable 'ab' is accessed in the
ath12k_mac_allocate() function. Initialize 'ab' with the first radio device
present in the hardware abstraction handle (ah). Additionally, move the
default setting procedure from the pdev mapping iteration to the total
radio calculating iteration for better code readability. Perform the
maximum radio validation check for total_radio to ensure that both num_hw
and radio_per_hw are validated indirectly, as these variables are derived
from total_radio. This also fixes the below Smatch static checker warning.

Smatch warning:
ath12k_mac_allocate() error: uninitialized symbol 'ab'

Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1

Fixes: a343d97f27f5 ("wifi: ath12k: move struct ath12k_hw from per device to group")
Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
---
 drivers/net/wireless/ath/ath12k/mac.c | 27 +++++++++++++++++++++------
 1 file changed, 21 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
index 5cdc1c38b049..98b2f853d243 100644
--- a/drivers/net/wireless/ath/ath12k/mac.c
+++ b/drivers/net/wireless/ath/ath12k/mac.c
@@ -10962,8 +10962,20 @@ int ath12k_mac_allocate(struct ath12k_hw_group *ag)
 	u8 radio_per_hw;
 
 	total_radio = 0;
-	for (i = 0; i < ag->num_devices; i++)
-		total_radio += ag->ab[i]->num_radios;
+	for (i = 0; i < ag->num_devices; i++) {
+		ab = ag->ab[i];
+		if (!ab)
+			continue;
+
+		ath12k_mac_set_device_defaults(ab);
+		total_radio += ab->num_radios;
+	}
+
+	if (!total_radio)
+		return -EINVAL;
+
+	if (WARN_ON(total_radio > ATH12K_GROUP_MAX_RADIO))
+		return -ENOSPC;
 
 	/* All pdev get combined and register as single wiphy based on
 	 * hardware group which participate in multi-link operation else
@@ -10976,14 +10988,16 @@ int ath12k_mac_allocate(struct ath12k_hw_group *ag)
 
 	num_hw = total_radio / radio_per_hw;
 
-	if (WARN_ON(num_hw >= ATH12K_GROUP_MAX_RADIO))
-		return -ENOSPC;
-
 	ag->num_hw = 0;
 	device_id = 0;
 	mac_id = 0;
 	for (i = 0; i < num_hw; i++) {
 		for (j = 0; j < radio_per_hw; j++) {
+			if (device_id >= ag->num_devices || !ag->ab[device_id]) {
+				ret = -ENOSPC;
+				goto err;
+			}
+
 			ab = ag->ab[device_id];
 			pdev_map[j].ab = ab;
 			pdev_map[j].pdev_idx = mac_id;
@@ -10995,10 +11009,11 @@ int ath12k_mac_allocate(struct ath12k_hw_group *ag)
 			if (mac_id >= ab->num_radios) {
 				mac_id = 0;
 				device_id++;
-				ath12k_mac_set_device_defaults(ab);
 			}
 		}
 
+		ab = pdev_map->ab;
+
 		ah = ath12k_mac_hw_allocate(ag, pdev_map, radio_per_hw);
 		if (!ah) {
 			ath12k_warn(ab, "failed to allocate mac80211 hw device for hw_idx %d\n",
-- 
2.34.1

Re: [PATCH 1/4] wifi: ath12k: Refactor ath12k_hw set helper function argument

[Kalle Valo]

Karthikeyan Periyasamy <quic_periyasa@quicinc.com> writes:

> Currently, ath12k_hw is placed inside the ath12k_hw_group. However, the
> ath12k_hw set helper function takes the device handle and the index as
> parameters. Here, the index parameter is specific to the group handle.
> Therefore, change this helper function argument from the device handle to
> the group handle.
>
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
>
> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>

What's the user visible impact here?

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH 2/4] wifi: ath12k: Refactor the ath12k_hw get helper function argument

[Kalle Valo]

Karthikeyan Periyasamy <quic_periyasa@quicinc.com> writes:

> Currently, ath12k_hw is placed inside the ath12k_hw_group. However, the
> ath12k_hw get helper function takes the device handle and the index as
> parameters. Here, the index parameter is specific to the group handle.
> Therefore, change this helper function argument from the device handle
> to the group handle.
>
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
>
> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>

Why?

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH 3/4] wifi: ath12k: Refactor ath12k_get_num_hw() helper function argument

[Kalle Valo]

Karthikeyan Periyasamy <quic_periyasa@quicinc.com> writes:

> Currently, the ath12k_get_num_hw() helper function takes the device handle
> as an argument. Here, the number of hardware is retrieved from the group
> handle. Demanding the device handle from the caller is unnecessary since
> in some cases the group handle is already available. Therefore, change this
> helper function argument from the device handle to the group handle. This
> also fixes the below Smatch static checker warning.
>
> Smatch warning:
> ath12k_mac_destroy() error: we previously assumed 'ab' could be null
>
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
>
> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
> Closes: https://lore.kernel.org/ath12k/3e705de0-67d1-4437-97ff-4828d83ae2af@stanley.mountain/
> Closes: https://scan7.scan.coverity.com/#/project-view/52682/11354?selectedIssue=1602340
> Fixes: a343d97f27f5 ("wifi: ath12k: move struct ath12k_hw from per device to group")
> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>

I don't get how this is any better but of course I might be missing
something. To me this looks like shuffling code around to shut up a
smatch warning.

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH 4/4] wifi: ath12k: Fix uninitialized variable access in ath12k_mac_allocate() function

[Kalle Valo]

Karthikeyan Periyasamy <quic_periyasa@quicinc.com> writes:

> Currently, the uninitialized variable 'ab' is accessed in the
> ath12k_mac_allocate() function. Initialize 'ab' with the first radio device
> present in the hardware abstraction handle (ah). Additionally, move the
> default setting procedure from the pdev mapping iteration to the total
> radio calculating iteration for better code readability. Perform the
> maximum radio validation check for total_radio to ensure that both num_hw
> and radio_per_hw are validated indirectly, as these variables are derived
> from total_radio. This also fixes the below Smatch static checker warning.
>
> Smatch warning:
> ath12k_mac_allocate() error: uninitialized symbol 'ab'
>
> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
>
> Fixes: a343d97f27f5 ("wifi: ath12k: move struct ath12k_hw from per device to group")
> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
> ---
>  drivers/net/wireless/ath/ath12k/mac.c | 27 +++++++++++++++++++++------
>  1 file changed, 21 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
> index 5cdc1c38b049..98b2f853d243 100644
> --- a/drivers/net/wireless/ath/ath12k/mac.c
> +++ b/drivers/net/wireless/ath/ath12k/mac.c
> @@ -10962,8 +10962,20 @@ int ath12k_mac_allocate(struct ath12k_hw_group *ag)
>  	u8 radio_per_hw;
>  
>  	total_radio = 0;
> -	for (i = 0; i < ag->num_devices; i++)
> -		total_radio += ag->ab[i]->num_radios;
> +	for (i = 0; i < ag->num_devices; i++) {
> +		ab = ag->ab[i];
> +		if (!ab)
> +			continue;
> +
> +		ath12k_mac_set_device_defaults(ab);
> +		total_radio += ab->num_radios;
> +	}
> +
> +	if (!total_radio)
> +		return -EINVAL;

'total_radio == 0' is more readable as it's a counter. Also please add ath12k_warn()

> +
> +	if (WARN_ON(total_radio > ATH12K_GROUP_MAX_RADIO))
> +		return -ENOSPC;

BTW ath12k_warn() is preferred over WARN_ON(), but this is just for the
future as this WARN_ON() was already there before.

>  
>  	/* All pdev get combined and register as single wiphy based on
>  	 * hardware group which participate in multi-link operation else
> @@ -10976,14 +10988,16 @@ int ath12k_mac_allocate(struct ath12k_hw_group *ag)
>  
>  	num_hw = total_radio / radio_per_hw;
>  
> -	if (WARN_ON(num_hw >= ATH12K_GROUP_MAX_RADIO))
> -		return -ENOSPC;
> -
>  	ag->num_hw = 0;
>  	device_id = 0;
>  	mac_id = 0;
>  	for (i = 0; i < num_hw; i++) {
>  		for (j = 0; j < radio_per_hw; j++) {
> +			if (device_id >= ag->num_devices || !ag->ab[device_id]) {
> +				ret = -ENOSPC;
> +				goto err;
> +			}

ath12k_warn()

-- 
https://patchwork.kernel.org/project/linux-wireless/list/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches

Re: [PATCH 1/4] wifi: ath12k: Refactor ath12k_hw set helper function argument

[Karthikeyan Periyasamy]

On 12/12/2024 1:16 PM, Kalle Valo wrote:
> Karthikeyan Periyasamy <quic_periyasa@quicinc.com> writes:
> 
>> Currently, ath12k_hw is placed inside the ath12k_hw_group. However, the
>> ath12k_hw set helper function takes the device handle and the index as
>> parameters. Here, the index parameter is specific to the group handle.
>> Therefore, change this helper function argument from the device handle to
>> the group handle.
>>
>> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
>>
>> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
> 
> What's the user visible impact here?
> 

No user visible, it just help to avoid the dependency of device handle 
(ab) for using the helper function ath12k_*_set_ah().


-- 
Karthikeyan Periyasamy
--
கார்த்திகேயன் பெரியசாமி

Re: [PATCH 2/4] wifi: ath12k: Refactor the ath12k_hw get helper function argument

[Karthikeyan Periyasamy]

On 12/12/2024 1:17 PM, Kalle Valo wrote:
> Karthikeyan Periyasamy <quic_periyasa@quicinc.com> writes:
> 
>> Currently, ath12k_hw is placed inside the ath12k_hw_group. However, the
>> ath12k_hw get helper function takes the device handle and the index as
>> parameters. Here, the index parameter is specific to the group handle.
>> Therefore, change this helper function argument from the device handle
>> to the group handle.
>>
>> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
>>
>> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
> 
> Why?
> 

It just remove the dependency of device handle (ab) for using the helper 
function ath12k_*_to_ah(). Now the caller can directly use 
ath12k_hw_group (ag) instead of forcing to use the device handle from ag.

-- 
Karthikeyan Periyasamy
--
கார்த்திகேயன் பெரியசாமி

Re: [PATCH 3/4] wifi: ath12k: Refactor ath12k_get_num_hw() helper function argument

[Karthikeyan Periyasamy]

On 12/12/2024 1:19 PM, Kalle Valo wrote:
> Karthikeyan Periyasamy <quic_periyasa@quicinc.com> writes:
> 
>> Currently, the ath12k_get_num_hw() helper function takes the device handle
>> as an argument. Here, the number of hardware is retrieved from the group
>> handle. Demanding the device handle from the caller is unnecessary since
>> in some cases the group handle is already available. Therefore, change this
>> helper function argument from the device handle to the group handle. This
>> also fixes the below Smatch static checker warning.
>>
>> Smatch warning:
>> ath12k_mac_destroy() error: we previously assumed 'ab' could be null
>>
>> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
>>
>> Reported-by: Dan Carpenter <dan.carpenter@linaro.org>
>> Closes: https://lore.kernel.org/ath12k/3e705de0-67d1-4437-97ff-4828d83ae2af@stanley.mountain/
>> Closes: https://scan7.scan.coverity.com/#/project-view/52682/11354?selectedIssue=1602340
>> Fixes: a343d97f27f5 ("wifi: ath12k: move struct ath12k_hw from per device to group")
>> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
> 
> I don't get how this is any better but of course I might be missing
> something. To me this looks like shuffling code around to shut up a
> smatch warning.
> 

It just remove the dependency of device handle (ab) for using the helper 
function ath12k_get_num_hw(). Now the caller can directly use 
ath12k_hw_group (ag) instead of forcing to use the device handle from 
ag. Because there may be error case where no device present in the ag.

-- 
Karthikeyan Periyasamy
--
கார்த்திகேயன் பெரியசாமி

Re: [PATCH 4/4] wifi: ath12k: Fix uninitialized variable access in ath12k_mac_allocate() function

[Karthikeyan Periyasamy]

On 12/12/2024 1:26 PM, Kalle Valo wrote:
> Karthikeyan Periyasamy <quic_periyasa@quicinc.com> writes:
> 
>> Currently, the uninitialized variable 'ab' is accessed in the
>> ath12k_mac_allocate() function. Initialize 'ab' with the first radio device
>> present in the hardware abstraction handle (ah). Additionally, move the
>> default setting procedure from the pdev mapping iteration to the total
>> radio calculating iteration for better code readability. Perform the
>> maximum radio validation check for total_radio to ensure that both num_hw
>> and radio_per_hw are validated indirectly, as these variables are derived
>> from total_radio. This also fixes the below Smatch static checker warning.
>>
>> Smatch warning:
>> ath12k_mac_allocate() error: uninitialized symbol 'ab'
>>
>> Tested-on: QCN9274 hw2.0 PCI WLAN.WBE.1.3.1-00173-QCAHKSWPL_SILICONZ-1
>>
>> Fixes: a343d97f27f5 ("wifi: ath12k: move struct ath12k_hw from per device to group")
>> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
>> ---
>>   drivers/net/wireless/ath/ath12k/mac.c | 27 +++++++++++++++++++++------
>>   1 file changed, 21 insertions(+), 6 deletions(-)
>>
>> diff --git a/drivers/net/wireless/ath/ath12k/mac.c b/drivers/net/wireless/ath/ath12k/mac.c
>> index 5cdc1c38b049..98b2f853d243 100644
>> --- a/drivers/net/wireless/ath/ath12k/mac.c
>> +++ b/drivers/net/wireless/ath/ath12k/mac.c
>> @@ -10962,8 +10962,20 @@ int ath12k_mac_allocate(struct ath12k_hw_group *ag)
>>   	u8 radio_per_hw;
>>   
>>   	total_radio = 0;
>> -	for (i = 0; i < ag->num_devices; i++)
>> -		total_radio += ag->ab[i]->num_radios;
>> +	for (i = 0; i < ag->num_devices; i++) {
>> +		ab = ag->ab[i];
>> +		if (!ab)
>> +			continue;
>> +
>> +		ath12k_mac_set_device_defaults(ab);
>> +		total_radio += ab->num_radios;
>> +	}
>> +
>> +	if (!total_radio)
>> +		return -EINVAL;
> 
> 'total_radio == 0' is more readable as it's a counter. Also please add ath12k_warn()
> 

This condition came due to no device handle (ab) present in the 
ath12k_hw_group (ag). ath12k_warn() cannot be used since no device (ab) 
present here. Additionally, ath12k_hw_warn() also cannot be used here 
since ath12k_hw (ah) also not created.

In future, we can introduce device (ab) and hardware (ah) agnostic 
warning helper function ath12k*dbg() for this usecase.

>> +
>> +	if (WARN_ON(total_radio > ATH12K_GROUP_MAX_RADIO))
>> +		return -ENOSPC;
> 
> BTW ath12k_warn() is preferred over WARN_ON(), but this is just for the
> future as this WARN_ON() was already there before.
> 

Sure

>>   
>>   	/* All pdev get combined and register as single wiphy based on
>>   	 * hardware group which participate in multi-link operation else
>> @@ -10976,14 +10988,16 @@ int ath12k_mac_allocate(struct ath12k_hw_group *ag)
>>   
>>   	num_hw = total_radio / radio_per_hw;
>>   
>> -	if (WARN_ON(num_hw >= ATH12K_GROUP_MAX_RADIO))
>> -		return -ENOSPC;
>> -
>>   	ag->num_hw = 0;
>>   	device_id = 0;
>>   	mac_id = 0;
>>   	for (i = 0; i < num_hw; i++) {
>>   		for (j = 0; j < radio_per_hw; j++) {
>> +			if (device_id >= ag->num_devices || !ag->ab[device_id]) {
>> +				ret = -ENOSPC;
>> +				goto err;
>> +			}
> 
> ath12k_warn()
> 

same here.

-- 
Karthikeyan Periyasamy
--
கார்த்திகேயன் பெரியசாமி