Merge branch 'pci/pci-sysfs'

- Move reset related sysfs code from pci.c to pci-sysfs.c where other
  similar code lives (Ilpo Järvinen)

- Simplify reset_method_store() memory management by using __free() instead
  of explicit kfree() cleanup (Ilpo Järvinen)

- Drop unnecessary zero initializer (Ilpo Järvinen)

* pci/pci-sysfs:
  PCI/sysfs: Remove unnecessary zero in initializer
  PCI/sysfs: Use __free() in reset_method_store()
  PCI/sysfs: Move reset related sysfs code to correct file

Author: bjorn-helgaas

drivers/pci/pci-sysfs.c

@@ -13,6 +13,7 @@
  */
 
 #include <linux/bitfield.h>
+#include <linux/cleanup.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/pci.h>
@@ -1421,6 +1422,113 @@ static const struct attribute_group pci_dev_reset_attr_group = {
 	.is_visible = pci_dev_reset_attr_is_visible,
 };
 
+static ssize_t reset_method_show(struct device *dev,
+				 struct device_attribute *attr, char *buf)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	ssize_t len = 0;
+	int i, m;
+
+	for (i = 0; i < PCI_NUM_RESET_METHODS; i++) {
+		m = pdev->reset_methods[i];
+		if (!m)
+			break;
+
+		len += sysfs_emit_at(buf, len, "%s%s", len ? " " : "",
+				     pci_reset_fn_methods[m].name);
+	}
+
+	if (len)
+		len += sysfs_emit_at(buf, len, "\n");
+
+	return len;
+}
+
+static int reset_method_lookup(const char *name)
+{
+	int m;
+
+	for (m = 1; m < PCI_NUM_RESET_METHODS; m++) {
+		if (sysfs_streq(name, pci_reset_fn_methods[m].name))
+			return m;
+	}
+
+	return 0;	/* not found */
+}
+
+static ssize_t reset_method_store(struct device *dev,
+				  struct device_attribute *attr,
+				  const char *buf, size_t count)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	char *tmp_options, *name;
+	int m, n;
+	u8 reset_methods[PCI_NUM_RESET_METHODS] = {};
+
+	if (sysfs_streq(buf, "")) {
+		pdev->reset_methods[0] = 0;
+		pci_warn(pdev, "All device reset methods disabled by user");
+		return count;
+	}
+
+	if (sysfs_streq(buf, "default")) {
+		pci_init_reset_methods(pdev);
+		return count;
+	}
+
+	char *options __free(kfree) = kstrndup(buf, count, GFP_KERNEL);
+	if (!options)
+		return -ENOMEM;
+
+	n = 0;
+	tmp_options = options;
+	while ((name = strsep(&tmp_options, " ")) != NULL) {
+		if (sysfs_streq(name, ""))
+			continue;
+
+		name = strim(name);
+
+		/* Leave previous methods unchanged if input is invalid */
+		m = reset_method_lookup(name);
+		if (!m) {
+			pci_err(pdev, "Invalid reset method '%s'", name);
+			return -EINVAL;
+		}
+
+		if (pci_reset_fn_methods[m].reset_fn(pdev, PCI_RESET_PROBE)) {
+			pci_err(pdev, "Unsupported reset method '%s'", name);
+			return -EINVAL;
+		}
+
+		if (n == PCI_NUM_RESET_METHODS - 1) {
+			pci_err(pdev, "Too many reset methods\n");
+			return -EINVAL;
+		}
+
+		reset_methods[n++] = m;
+	}
+
+	reset_methods[n] = 0;
+
+	/* Warn if dev-specific supported but not highest priority */
+	if (pci_reset_fn_methods[1].reset_fn(pdev, PCI_RESET_PROBE) == 0 &&
+	    reset_methods[0] != 1)
+		pci_warn(pdev, "Device-specific reset disabled/de-prioritized by user");
+	memcpy(pdev->reset_methods, reset_methods, sizeof(pdev->reset_methods));
+	return count;
+}
+static DEVICE_ATTR_RW(reset_method);
+
+static struct attribute *pci_dev_reset_method_attrs[] = {
+	&dev_attr_reset_method.attr,
+	NULL,
+};
+
+static const struct attribute_group pci_dev_reset_method_attr_group = {
+	.attrs = pci_dev_reset_method_attrs,
+	.is_visible = pci_dev_reset_attr_is_visible,
+};
+
 static ssize_t __resource_resize_show(struct device *dev, int n, char *buf)
 {
 	struct pci_dev *pdev = to_pci_dev(dev);

drivers/pci/pci.c

@@ -5163,7 +5163,7 @@ static void pci_dev_restore(struct pci_dev *dev)
 }
 
 /* dev->reset_methods[] is a 0-terminated list of indices into this array */
-static const struct pci_reset_fn_method pci_reset_fn_methods[] = {
+const struct pci_reset_fn_method pci_reset_fn_methods[] = {
 	{ },
 	{ pci_dev_specific_reset, .name = "device_specific" },
 	{ pci_dev_acpi_reset, .name = "acpi" },
@@ -5174,129 +5174,6 @@ static const struct pci_reset_fn_method pci_reset_fn_methods[] = {
 	{ cxl_reset_bus_function, .name = "cxl_bus" },
 };
 
-static ssize_t reset_method_show(struct device *dev,
-				 struct device_attribute *attr, char *buf)
-{
-	struct pci_dev *pdev = to_pci_dev(dev);
-	ssize_t len = 0;
-	int i, m;
-
-	for (i = 0; i < PCI_NUM_RESET_METHODS; i++) {
-		m = pdev->reset_methods[i];
-		if (!m)
-			break;
-
-		len += sysfs_emit_at(buf, len, "%s%s", len ? " " : "",
-				     pci_reset_fn_methods[m].name);
-	}
-
-	if (len)
-		len += sysfs_emit_at(buf, len, "\n");
-
-	return len;
-}
-
-static int reset_method_lookup(const char *name)
-{
-	int m;
-
-	for (m = 1; m < PCI_NUM_RESET_METHODS; m++) {
-		if (sysfs_streq(name, pci_reset_fn_methods[m].name))
-			return m;
-	}
-
-	return 0;	/* not found */
-}
-
-static ssize_t reset_method_store(struct device *dev,
-				  struct device_attribute *attr,
-				  const char *buf, size_t count)
-{
-	struct pci_dev *pdev = to_pci_dev(dev);
-	char *options, *tmp_options, *name;
-	int m, n;
-	u8 reset_methods[PCI_NUM_RESET_METHODS] = { 0 };
-
-	if (sysfs_streq(buf, "")) {
-		pdev->reset_methods[0] = 0;
-		pci_warn(pdev, "All device reset methods disabled by user");
-		return count;
-	}
-
-	if (sysfs_streq(buf, "default")) {
-		pci_init_reset_methods(pdev);
-		return count;
-	}
-
-	options = kstrndup(buf, count, GFP_KERNEL);
-	if (!options)
-		return -ENOMEM;
-
-	n = 0;
-	tmp_options = options;
-	while ((name = strsep(&tmp_options, " ")) != NULL) {
-		if (sysfs_streq(name, ""))
-			continue;
-
-		name = strim(name);
-
-		m = reset_method_lookup(name);
-		if (!m) {
-			pci_err(pdev, "Invalid reset method '%s'", name);
-			goto error;
-		}
-
-		if (pci_reset_fn_methods[m].reset_fn(pdev, PCI_RESET_PROBE)) {
-			pci_err(pdev, "Unsupported reset method '%s'", name);
-			goto error;
-		}
-
-		if (n == PCI_NUM_RESET_METHODS - 1) {
-			pci_err(pdev, "Too many reset methods\n");
-			goto error;
-		}
-
-		reset_methods[n++] = m;
-	}
-
-	reset_methods[n] = 0;
-
-	/* Warn if dev-specific supported but not highest priority */
-	if (pci_reset_fn_methods[1].reset_fn(pdev, PCI_RESET_PROBE) == 0 &&
-	    reset_methods[0] != 1)
-		pci_warn(pdev, "Device-specific reset disabled/de-prioritized by user");
-	memcpy(pdev->reset_methods, reset_methods, sizeof(pdev->reset_methods));
-	kfree(options);
-	return count;
-
-error:
-	/* Leave previous methods unchanged */
-	kfree(options);
-	return -EINVAL;
-}
-static DEVICE_ATTR_RW(reset_method);
-
-static struct attribute *pci_dev_reset_method_attrs[] = {
-	&dev_attr_reset_method.attr,
-	NULL,
-};
-
-static umode_t pci_dev_reset_method_attr_is_visible(struct kobject *kobj,
-						    struct attribute *a, int n)
-{
-	struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
-
-	if (!pci_reset_supported(pdev))
-		return 0;
-
-	return a->mode;
-}
-
-const struct attribute_group pci_dev_reset_method_attr_group = {
-	.attrs = pci_dev_reset_method_attrs,
-	.is_visible = pci_dev_reset_method_attr_is_visible,
-};
-
 /**
  * __pci_reset_function_locked - reset a PCI device function while holding
  * the @dev mutex lock.

drivers/pci/pci.h

@@ -777,6 +777,7 @@ struct pci_reset_fn_method {
 	int (*reset_fn)(struct pci_dev *pdev, bool probe);
 	char *name;
 };
+extern const struct pci_reset_fn_method pci_reset_fn_methods[];
 
 #ifdef CONFIG_PCI_QUIRKS
 int pci_dev_specific_reset(struct pci_dev *dev, bool probe);
@@ -964,8 +965,6 @@ static inline pci_power_t acpi_pci_choose_state(struct pci_dev *pdev)
 extern const struct attribute_group aspm_ctrl_attr_group;
 #endif
 
-extern const struct attribute_group pci_dev_reset_method_attr_group;
-
 #ifdef CONFIG_X86_INTEL_MID
 bool pci_use_mid_pm(void);
 int mid_pci_set_power_state(struct pci_dev *pdev, pci_power_t state);