From dd05add7b2b6004c5fa3a1f276f56d8668f86b65 Mon Sep 17 00:00:00 2001 From: Paulo Alcantara Date: Sat, 26 Sep 2026 19:20:30 -0300 Subject: netfs: zero the tail of a short DIO/unbuffered read The buffered read collector zero-fills the tail of a short read that stops below the inode's i_size (netfs_clear_unread()), so a read that races an extending write still returns the expected number of bytes. The non-buffered collector path does no such thing: it just records how much was transferred. Add the same zero-fill for the non-buffered case, gated on NETFS_SREQ_CLEAR_TAIL: a subreq's source sets that flag when a short result from it is known to be safe to treat as a hole, as opposed to NETFS_SREQ_HIT_EOF, which means the read genuinely ran off the end of the file and should be reported short as-is. Only CLEAR_TAIL should zero-fill here; a real EOF must stay a real short read. No source currently sets CLEAR_TAIL on an unbuffered/DIO subrequest, so this is inert on its own -- a following change teaches cifs to set it in the one case that needs it. Fixes: e2d46f2ec332 ("netfs: Change the read result collector to only use one work item") Reviewed-by: David Howells Reviewed-by: Namjae Jeon Signed-off-by: Paulo Alcantara Cc: Christian Brauner Cc: Matthew Wilcox Cc: Ronnie Sahlberg Cc: Shyam Prasad N Cc: Tom Talpey Cc: Bharath SM Cc: stable@vger.kernel.org --- net/wireless/ethtool.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 net/wireless/ethtool.c (limited to 'net/wireless/ethtool.c') diff --git a/net/wireless/ethtool.c b/net/wireless/ethtool.c new file mode 100644 index 000000000..46e4317cb --- /dev/null +++ b/net/wireless/ethtool.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0 +#include +#include +#include "core.h" +#include "rdev-ops.h" + +void cfg80211_get_drvinfo(struct net_device *dev, struct ethtool_drvinfo *info) +{ + struct wireless_dev *wdev = dev->ieee80211_ptr; + struct device *pdev = wiphy_dev(wdev->wiphy); + + if (pdev->driver) + strscpy(info->driver, pdev->driver->name, + sizeof(info->driver)); + else + strscpy(info->driver, "N/A", sizeof(info->driver)); + + strscpy(info->version, init_utsname()->release, sizeof(info->version)); + + if (wdev->wiphy->fw_version[0]) + strscpy(info->fw_version, wdev->wiphy->fw_version, + sizeof(info->fw_version)); + else + strscpy(info->fw_version, "N/A", sizeof(info->fw_version)); + + strscpy(info->bus_info, dev_name(pdev), + sizeof(info->bus_info)); +} +EXPORT_SYMBOL(cfg80211_get_drvinfo); -- cgit v1.3.1