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From: refactormyself@gmail.com
To: helgaas@kernel.org
Cc: Bolarinwa Olayemi Saheed <refactormyself@gmail.com>,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-kernel-mentees@lists.linuxfoundation.org
Subject: [Linux-kernel-mentees] [PATCH 2/2] PCI: pciehp: Fix wrong failure check on pcie_capability_read_*()
Date: Fri, 19 Jun 2020 22:12:19 +0200	[thread overview]
Message-ID: <20200619201219.32126-3-refactormyself@gmail.com> (raw)
In-Reply-To: <20200619201219.32126-1-refactormyself@gmail.com>

From: Bolarinwa Olayemi Saheed <refactormyself@gmail.com>

On failure, pcie_capabiility_read_*() will set the status value,
its last parameter to 0 and not ~0.
This bug fix checks for the proper value.

Signed-off-by: Bolarinwa Olayemi Saheed <refactormyself@gmail.com>
---
 drivers/pci/hotplug/pciehp_hpc.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 53433b37e181..c1a67054948a 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -89,7 +89,7 @@ static int pcie_poll_cmd(struct controller *ctrl, int timeout)
 
 	do {
 		pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
-		if (slot_status == (u16) ~0) {
+		if (slot_status == (u16)0) {
 			ctrl_info(ctrl, "%s: no response from device\n",
 				  __func__);
 			return 0;
@@ -165,7 +165,7 @@ static void pcie_do_write_cmd(struct controller *ctrl, u16 cmd,
 	pcie_wait_cmd(ctrl);
 
 	pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl);
-	if (slot_ctrl == (u16) ~0) {
+	if (slot_ctrl == (u16)0) {
 		ctrl_info(ctrl, "%s: no response from device\n", __func__);
 		goto out;
 	}
@@ -236,7 +236,7 @@ int pciehp_check_link_active(struct controller *ctrl)
 	int ret;
 
 	ret = pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
-	if (ret == PCIBIOS_DEVICE_NOT_FOUND || lnk_status == (u16)~0)
+	if (ret == PCIBIOS_DEVICE_NOT_FOUND || lnk_status == (u16)0)
 		return -ENODEV;
 
 	ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA);
@@ -440,7 +440,7 @@ int pciehp_card_present(struct controller *ctrl)
 	int ret;
 
 	ret = pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
-	if (ret == PCIBIOS_DEVICE_NOT_FOUND || slot_status == (u16)~0)
+	if (ret == PCIBIOS_DEVICE_NOT_FOUND || slot_status == (u16)0)
 		return -ENODEV;
 
 	return !!(slot_status & PCI_EXP_SLTSTA_PDS);
@@ -592,7 +592,7 @@ static irqreturn_t pciehp_isr(int irq, void *dev_id)
 
 read_status:
 	pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &status);
-	if (status == (u16) ~0) {
+	if (status == (u16)0) {
 		ctrl_info(ctrl, "%s: no response from device\n", __func__);
 		if (parent)
 			pm_runtime_put(parent);
-- 
2.18.2

_______________________________________________
Linux-kernel-mentees mailing list
Linux-kernel-mentees@lists.linuxfoundation.org
https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees

WARNING: multiple messages have this Message-ID (diff)
From: refactormyself@gmail.com
To: helgaas@kernel.org
Cc: Bolarinwa Olayemi Saheed <refactormyself@gmail.com>,
	bjorn@helgaas.com, linux-pci@vger.kernel.org,
	skhan@linuxfoundation.org,
	linux-kernel-mentees@lists.linuxfoundation.org,
	linux-kernel@vger.kernel.org
Subject: [PATCH 2/2] PCI: pciehp: Fix wrong failure check on pcie_capability_read_*()
Date: Fri, 19 Jun 2020 22:12:19 +0200	[thread overview]
Message-ID: <20200619201219.32126-3-refactormyself@gmail.com> (raw)
In-Reply-To: <20200619201219.32126-1-refactormyself@gmail.com>

From: Bolarinwa Olayemi Saheed <refactormyself@gmail.com>

On failure, pcie_capabiility_read_*() will set the status value,
its last parameter to 0 and not ~0.
This bug fix checks for the proper value.

Signed-off-by: Bolarinwa Olayemi Saheed <refactormyself@gmail.com>
---
 drivers/pci/hotplug/pciehp_hpc.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 53433b37e181..c1a67054948a 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -89,7 +89,7 @@ static int pcie_poll_cmd(struct controller *ctrl, int timeout)
 
 	do {
 		pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
-		if (slot_status == (u16) ~0) {
+		if (slot_status == (u16)0) {
 			ctrl_info(ctrl, "%s: no response from device\n",
 				  __func__);
 			return 0;
@@ -165,7 +165,7 @@ static void pcie_do_write_cmd(struct controller *ctrl, u16 cmd,
 	pcie_wait_cmd(ctrl);
 
 	pcie_capability_read_word(pdev, PCI_EXP_SLTCTL, &slot_ctrl);
-	if (slot_ctrl == (u16) ~0) {
+	if (slot_ctrl == (u16)0) {
 		ctrl_info(ctrl, "%s: no response from device\n", __func__);
 		goto out;
 	}
@@ -236,7 +236,7 @@ int pciehp_check_link_active(struct controller *ctrl)
 	int ret;
 
 	ret = pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &lnk_status);
-	if (ret == PCIBIOS_DEVICE_NOT_FOUND || lnk_status == (u16)~0)
+	if (ret == PCIBIOS_DEVICE_NOT_FOUND || lnk_status == (u16)0)
 		return -ENODEV;
 
 	ret = !!(lnk_status & PCI_EXP_LNKSTA_DLLLA);
@@ -440,7 +440,7 @@ int pciehp_card_present(struct controller *ctrl)
 	int ret;
 
 	ret = pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &slot_status);
-	if (ret == PCIBIOS_DEVICE_NOT_FOUND || slot_status == (u16)~0)
+	if (ret == PCIBIOS_DEVICE_NOT_FOUND || slot_status == (u16)0)
 		return -ENODEV;
 
 	return !!(slot_status & PCI_EXP_SLTSTA_PDS);
@@ -592,7 +592,7 @@ static irqreturn_t pciehp_isr(int irq, void *dev_id)
 
 read_status:
 	pcie_capability_read_word(pdev, PCI_EXP_SLTSTA, &status);
-	if (status == (u16) ~0) {
+	if (status == (u16)0) {
 		ctrl_info(ctrl, "%s: no response from device\n", __func__);
 		if (parent)
 			pm_runtime_put(parent);
-- 
2.18.2


  parent reply	other threads:[~2020-06-19 21:12 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-19 20:12 [Linux-kernel-mentees] [PATCH 0/2] Fix wrong failure check on pcie_capability_read_*() refactormyself
2020-06-19 20:12 ` refactormyself
2020-06-19 20:12 ` [Linux-kernel-mentees] [PATCH 1/2] PCI/PME: " refactormyself
2020-06-19 20:12   ` refactormyself
2020-06-19 20:12 ` refactormyself [this message]
2020-06-19 20:12   ` [PATCH 2/2] PCI: pciehp: " refactormyself
2020-06-20  9:09   ` [Linux-kernel-mentees] " Lukas Wunner
2020-06-20  9:09     ` Lukas Wunner
2020-06-26 19:14     ` [Linux-kernel-mentees] " Bjorn Helgaas
2020-06-26 19:14       ` Bjorn Helgaas

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