From f8cf6e513ec4f0e207f56c27d5030da429ac2cae Mon Sep 17 00:00:00 2001 From: Krzysztof Wilczyński Date: Thu, 3 Jun 2021 00:01:07 +0000 Subject: PCI/sysfs: Use sysfs_emit() and sysfs_emit_at() in "show" functions MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The sysfs_emit() and sysfs_emit_at() functions were introduced to make it less ambiguous which function is preferred when writing to the output buffer in a device attribute's "show" callback [1]. Convert the PCI sysfs object "show" functions from sprintf(), snprintf() and scnprintf() to sysfs_emit() and sysfs_emit_at() accordingly, as the latter is aware of the PAGE_SIZE buffer and correctly returns the number of bytes written into the buffer. No functional change intended. [1] Documentation/filesystems/sysfs.rst Related commit: ad025f8e46f3 ("PCI/sysfs: Use sysfs_emit() and sysfs_emit_at() in "show" functions"). Link: https://lore.kernel.org/r/20210603000112.703037-2-kw@linux.com Signed-off-by: Krzysztof Wilczyński Signed-off-by: Bjorn Helgaas Reviewed-by: Logan Gunthorpe --- drivers/pci/pcie/aer.c | 20 +++++++++++--------- drivers/pci/pcie/aspm.c | 4 ++-- 2 files changed, 13 insertions(+), 11 deletions(-) (limited to 'drivers/pci/pcie') diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c index ec943cee5ecc..40ef7bed7a77 100644 --- a/drivers/pci/pcie/aer.c +++ b/drivers/pci/pcie/aer.c @@ -529,21 +529,23 @@ static const char *aer_agent_string[] = { char *buf) \ { \ unsigned int i; \ - char *str = buf; \ struct pci_dev *pdev = to_pci_dev(dev); \ u64 *stats = pdev->aer_stats->stats_array; \ + size_t len = 0; \ \ for (i = 0; i < ARRAY_SIZE(strings_array); i++) { \ if (strings_array[i]) \ - str += sprintf(str, "%s %llu\n", \ - strings_array[i], stats[i]); \ + len += sysfs_emit_at(buf, len, "%s %llu\n", \ + strings_array[i], \ + stats[i]); \ else if (stats[i]) \ - str += sprintf(str, #stats_array "_bit[%d] %llu\n",\ - i, stats[i]); \ + len += sysfs_emit_at(buf, len, \ + #stats_array "_bit[%d] %llu\n",\ + i, stats[i]); \ } \ - str += sprintf(str, "TOTAL_%s %llu\n", total_string, \ - pdev->aer_stats->total_field); \ - return str-buf; \ + len += sysfs_emit_at(buf, len, "TOTAL_%s %llu\n", total_string, \ + pdev->aer_stats->total_field); \ + return len; \ } \ static DEVICE_ATTR_RO(name) @@ -563,7 +565,7 @@ aer_stats_dev_attr(aer_dev_nonfatal, dev_nonfatal_errs, char *buf) \ { \ struct pci_dev *pdev = to_pci_dev(dev); \ - return sprintf(buf, "%llu\n", pdev->aer_stats->field); \ + return sysfs_emit(buf, "%llu\n", pdev->aer_stats->field); \ } \ static DEVICE_ATTR_RO(name) diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c index ac0557a305af..013a47f587ce 100644 --- a/drivers/pci/pcie/aspm.c +++ b/drivers/pci/pcie/aspm.c @@ -1208,7 +1208,7 @@ static ssize_t aspm_attr_show_common(struct device *dev, struct pci_dev *pdev = to_pci_dev(dev); struct pcie_link_state *link = pcie_aspm_get_link(pdev); - return sprintf(buf, "%d\n", (link->aspm_enabled & state) ? 1 : 0); + return sysfs_emit(buf, "%d\n", (link->aspm_enabled & state) ? 1 : 0); } static ssize_t aspm_attr_store_common(struct device *dev, @@ -1265,7 +1265,7 @@ static ssize_t clkpm_show(struct device *dev, struct pci_dev *pdev = to_pci_dev(dev); struct pcie_link_state *link = pcie_aspm_get_link(pdev); - return sprintf(buf, "%d\n", link->clkpm_enabled); + return sysfs_emit(buf, "%d\n", link->clkpm_enabled); } static ssize_t clkpm_store(struct device *dev, -- cgit v1.2.3