44 lines
1.5 KiB
Diff
44 lines
1.5 KiB
Diff
From f6d2cb561402c3b6d3627c0eb89e009b503d9067 Sun 17 01 11:38:45 2021
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From: Simon Vogl <simon.vogl@gmx.net>
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Date: Sun, 17 Jan 2021 11:38:45 UTC
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Subject: [PATCH] Fix USB Device enumeration
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This patch fixes a regression introduced in libusb 1.0.24 that prevents certain devices like smartphones from being detected.
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diff --git a/libusb/os/linux_usbfs.c b/libusb/os/linux_usbfs.c
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index fb2ed53a..4d2dc8d6 100644
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--- a/libusb/os/linux_usbfs.c
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+++ b/libusb/os/linux_usbfs.c
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@@ -641,7 +641,12 @@ static int seek_to_next_config(struct libusb_context *ctx,
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uint8_t *buffer, size_t len)
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{
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struct usbi_descriptor_header *header;
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- int offset = 0;
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+ int offset;
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+
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+ /* Start seeking past the config descriptor */
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+ offset = LIBUSB_DT_CONFIG_SIZE;
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+ buffer += LIBUSB_DT_CONFIG_SIZE;
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+ len -= LIBUSB_DT_CONFIG_SIZE;
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while (len > 0) {
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if (len < 2) {
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@@ -718,7 +723,7 @@ static int parse_config_descriptors(struct libusb_device *dev)
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}
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if (priv->sysfs_dir) {
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- /*
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+ /*
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* In sysfs wTotalLength is ignored, instead the kernel returns a
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* config descriptor with verified bLength fields, with descriptors
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* with an invalid bLength removed.
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@@ -727,8 +732,7 @@ static int parse_config_descriptors(struct libusb_device *dev)
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int offset;
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if (num_configs > 1 && idx < num_configs - 1) {
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- offset = seek_to_next_config(ctx, buffer + LIBUSB_DT_CONFIG_SIZE,
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- remaining - LIBUSB_DT_CONFIG_SIZE);
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+ offset = seek_to_next_config(ctx, buffer, remaining);
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if (offset < 0)
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return offset;
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sysfs_config_len = (uint16_t)offset;
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